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  • 1.
    Arnesén, Lisa
    University of Skövde, School of Bioscience.
    Vems landskap ska förändras för att öka den biologiska mångfalden?: En studie av skillnaderna i odlingslandskapets konnektivitet med avseende på två skyddsvärda arter med olika preferenser2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Organisms relevant for nature conservation dont follow administrative borders. Because of this there is a need for a landscape perspective within conservation and planning, and a need for the species of interest to have legal protection. Network analysis adapted for ecological purposes has grown to become a powerful tool for studying and communicating the relationships between species dispersion and access to habitat. In this study the following question is posed: How is the Osmoderma eremita and the Pernis apivorus dispersal possibilities in the small scale cultivated landscape of Borås affected by exploitation in respect to a) dispersal ability, b) habitat quality, c) position of habitat patches in a network? The analysis were based on municipal and regional nature conservation data, which in due to confidentiality is not accounted for in the report by maps, coordinates, etc. Several networks were established for both species to indicate how habitat patches are distributed today and how the species dispersal changes depending on which patches are excluded – this was done to imitate how exploitation can affect the species future survival and dispersion. The results showed that the O.e. is mainly inhibited by its poor dispersal abilities, followed by patch position, while the P.a. is the most affected by degrading habitat quality. The most important conclusions of the study were that the O.e. natural dispersal may be restricted but can be improved by linking small network components together and by maintaining the largest components. As for the P.a. it was concluded that a different type of analysis, focusing on its behaviour and need for different patches for different purposes, would generate more interesting results.

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    Vems landskap ska förändras för att öka den biologiska mångfalden?
  • 2.
    Banks, H. T.
    et al.
    Center for Research in Scientific Computation North Carolina State University Raleigh, NC, USA.
    Banks, J. E.
    Undergraduate Research Opportunities Center (UROC) California State University, Monterey Bay Seaside, CA, USA.
    Bommarco, Riccardo
    Department of Ecology Swedish University of Agricultural Sciences Uppsala, Sweden.
    Curtsdotter, Alva
    Department of Ecology Swedish University of Agricultural Sciences Uppsala, Sweden.
    Jonsson, Tomas
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. Department of Ecology Swedish University of Agricultural Sciences Uppsala, Sweden.
    Laubmeier, A. N.
    Center for Research in Scientific Computation North Carolina State University Raleigh, NC, USA.
    Parameter estimation for an allometric food web model2017In: International journal of pure and applied mathematics, ISSN 1311-8080, E-ISSN 1314-3395, Vol. 114, no 1, p. 143-160Article in journal (Refereed)
    Abstract [en]

    The application of mechanistic models to natural systems is of interest to ecological researchers. We use the mechanistic Allometric Trophic Network (ATN) model, whichis well-studied for controlled and theoretical systems, to describe the dynamics of the aphidRhopalosiphum padi in an agricultural field. We diagnose problems that arise in a first attemptat a least squares parameter estimation on this system, including formulation of the modelfor the inverse problem and information content present in the data. We seek to establishwhether the field data, as it is currently collected, can support parameter estimation for theATN model.

  • 3.
    Berg, Sofia
    et al.
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. Dept of Physics, Chemistry and Biology, Div. of Theoretical Biology, Linköping Univ., Linköping, Sweden.
    Pimenov, Aexander
    Weierstrass Inst., Berlin, Germany / Environmental Research Inst., Univ. College Cork, Cork, Ireland.
    Palmer, Catherine
    Weierstrass Inst., Berlin, Germany.
    Emmerson, Mark
    School of Biological Sciences, Queen's Univ. Belfast, Belfast, United Kingdom.
    Jonsson, Tomas
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. Dept of Ecology, Swedish Univ. of Agricultural Sciences, Uppsala, Sweden.
    Ecological communities are vulnerable to realistic extinction sequences2015In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 124, no 4, p. 486-496Article in journal (Refereed)
  • 4.
    Bergman, Jimmy
    University of Skövde, School of Life Sciences.
    Cellulär automat simulerar utbredning av Taraxacum2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I detta arbete undersöks vilken grad av inomartskonkurrens som ger upphov till ett observerat utbredningsmönster av maskrosor (Taraxacum sect. Ruderalia). Maskrosor har både fröspridning och vegetativ förökning. Studien hypotiserar att utbredningen kan beskrivas utifrån enkla regler för spridning och konkurrens. Dessa används i simuleringar med en binär cellulär automat där utveckling sker i deterministiska tidssteg. Modellen består av ett rutnät där en tom cell antingen kan förbli tom eller koloniseras, medan en upptagen cell antingen kan överleva eller dö ut. Reglerna efterliknar situationer med hög respektive låg känslighet för inomartskonkurrens. De mått på jämförelse mellan observation och simulering som används är mönstrets fraktala dimension, mönstrets tendens att aggregera och storleken på den enklaste algoritm som beskriver datan. Två olika initialvillkor används för att testa modellens robusthet. Den observerade utbredningen kontrolleras även mot slumpmässig fördelning. Resultaten visar att den observerade utbredningen är klusterartad. Simulering med en högre inomartskonkurrens beskriver utbredningen väl sett till aggregering och fraktal dimension. Lägre inomartskonkurrens beskriver dock maskrosornas verkliga utbredning sett till algoritmisk komplexitet, vilket tolkas som att individer kan leva närmare inpå varandra än vad regeln om högre inomartskonkurrens förutsätter. För vald klusterstorlek är simuleringarna ej känsliga för initialvillkoren, men då hela fördelningen av antal celler per klusterstorlek i stickprov på ett tidssteg analyseras har initialvillkoren fakstiskt betydelse. Sett till fördelningen av cell per klusterstorlek liknar ingen simulering den observerade utbredningen. Därmed kan modellen tänkas inrymma den vegetativa förökningen medan fröspridningen, som är stokastisk, ej inryms på samma vis.

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    examensarbete_jbergman
  • 5.
    Bergström, Lena
    et al.
    Swedish University of Agricultural Sciences, Department of Aquatic Resources, Öregrund, Sweden.
    Blenckner, Thorsten
    Stockholm Recilience Centre, Stockholm University, Stockholm, Sweden.
    Frelat, Romain
    University of Hamburg, Institute of Hydrobiology and Fishery Science, Hamburg, Germany.
    Grimvall, Anders
    Swedish Institute for the Marine Environment, Gothenburg, Sweden.
    Haapasaari, Päivi
    University of Helsinki, Department of Environmental Sciences, Helsinki, Finland.
    Haas, Bianca
    University of Hamburg, Institute of Hydrobiology and Fishery Science, Hamburg Germany.
    Heikinheimo, Outi
    Natural Resources Institute Finland, Helsinki, Finland.
    Jernberg, Susanna
    Finnish Environment Institute, Marine Research Centre, Helsinki, Finland.
    Large, Scott
    ICES, Copenhagen, Denmark.
    Lindegren, Martin
    Centre for Ocean Life, DTU-Aqua, Charlottenlund, Denmark.
    Levin, Phil
    Northwest Fisheries Science Center, Seattle, USA.
    Lehikoinen, Annukka
    Helsinki University, Kotka Maritime Research Centre, Kotka, Finland.
    Möllmann, Christian
    University of Hamburg, Institute of Hydrobiology and Fishery Science, Hamburg, Germany.
    Nordström, Marie
    Åbo Akademi University, Environmental and Marine Biology, Åbo, Finland.
    Norrström, Niclas
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Otto, Saskia
    University of Hamburg, Institute of Hydrobiology and Fishery Science, Hamburg, Germany.
    Peltonen, Heikki
    Marine Research Centre, Finnish Environment Institute, Helsinki, Finland.
    Précuchét, Laurence
    Centre for Ocean Life, DTU-Aqua, Charlottenlund, Denmark.
    Putnis, Ivars
    Institute of Food Safety, Animal Health and Environment BIOR, Fish Resources Research Department, Riga, Latvia.
    Romakkaniemi, Atso
    Natural Resources Institute Finland, Oulun yliopisto, Finland.
    Suikkanen, Sanna
    Finnish Environment Institute, Marine Research Centre, Helsinki, Finland.
    Torres, Marian
    Swedish University of Agricultural Sciences, Department of Aquatic Resources, Öregrund, Sweden.
    Uusitalo, Laura
    Finnish Environment Institute, Marine Research Centre, Helsinki, Finland.
    Weigel, Benjamin
    Åbo Akademi University, Environmental and Marine Biology, Åbo, Finland.
    Wesslander, Karin
    Swedish Meteorological and Hydrological Institute, Marine Environment, Västra Frölunda, Sweden.
    Zagrodzka, Zuzanna
    University of Hamburg, Institute of Hydrobiology and Fishery Science, Hamburg, Germany.
    Interim Report of the ICES/HELCOM Working Group on Integrated Assessments of the Baltic Sea (WGIAB): 18-22 April 2016 Helsinki, Finland2016Report (Other academic)
    Abstract [en]

    The ICES/HELCOM Working Group on Integrated Assessments of the Baltic Sea (WGIAB) meeting was held in Helsinki (Finland), 18-22 April 2016. The meeting was attended by 26 participants from five countries and chaired by Laura Uusitalo, Fin-land, Saskia Otto, Germany, Martin Lindegren, Denmark, and Lena Bergström, Swe-den. This was the first year of the new three-year Terms of Reference (ToR) for WGIAB. The main working activities in 2016 were to A) develop the trait-based ap-proach of understanding the ecosystem function, and B) explore the social-ecological system, including indicator development, revising the conceptual model, and devel-oping case studies. As a primary outcome of the ToR A, we built on our previous work on integrated ecosystem assessments (IEAs) in the Baltic Sea, but extended it beyond considering changes in abundances of a few dominant species, to accounting for community-wide changes in a number of key traits across multiple trophic levels. These traits represent various ecosystem functions upon which we derive important ecosystem services. By investigating temporal changes in the community weighted mean traits of phyto-plankton, zooplankton, zoobenthos, and fish, we demonstrated whether trait reor-ganizations at the level of entire communities occurred in the Central Baltic Sea as a result of the 1980s regime shift. Using in total 29 traits combined for all groups we found indications of two breakpoints across all four taxonomic groups over the last decades, i.e. one around 1990 and one around 2000. Further work will focus on ex-ploring the nature of the changes in trait composition and on standardizing the num-ber of traits and data types (i.e. binary, continuous or categorical) across taxonomic group.In addition, we collected data on key functional groups and abiotic variables in all main sub-basins of the Baltic Sea, setting the stage for a cross-regional comparison of temporal patterns and trends in lower trophic level in the face of recent develop-ments in climate-related drivers.With reference to Tor B, to explore how social indicators could be used in parallel with biological indicators in an integrated assessment framework, we developed a conceptual model of interrelationships between ecosystem and society. We used the model as a basis for mapping factors to be accounted for in the ecosystem-based management using the Baltic salmon and clupeid species as case studies. The models depict 1) the structure of the foodweb relevant to the target species, 2) the key com-munity level and population traits that contribute to the state of the species, 3) main pressures affecting the foodweb and their effects on the species, 4) key management measures, and 5) benefits that the species can produce for society.To support the development of Ecosystem Overview the group members evaluated the probability of occurrence and the magnitude of the effect of 15 pressures occur-ring in the Baltic Sea. The top five pressures identified were input of nutrients, in-creased temperature, decreased salinity, input of hazardous substances, and input or spread of non-indigenous species.The work will continue intersessionally and the next meeting of WGIAB is planned to be held in Lisbon, Portugal, back-to-back with WGCOMEDA and WGEAWESS.

  • 6.
    Blomstrand, Johanna
    University of Skövde, School of Life Sciences.
    Studie av kantzoner i Valleområdet och Varaslätten: Inventering av invertebrater, träd, mossor och lavar2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Ecotones are areas where different ecosystems meet, and they vary in sharpness and range. The areas provide a great biological diversity since they are a mixture of the meeting areas and provide special microclimate. The biological diversity is affected by the width, length and structure of the ecotone and they have a biological significance in that they provide habitat, protection and food to many species. To demonstrate where in the landscape there are ecotones the tool GIS can be used. In this work GIS have been used to define which areas the work is concentrated on and to randomize out points for inventory in the ecotones in these areas. Inventory of the ecotones was made with the help of twenty 5x2 meters big inventory boxes, ten in the Valle area and ten on the Vara flat. Invertebrates, trees, mosses and lichens where inventoried in the boxes. The aim of this work was to see how the biological diversity in ecotones between forest and open land differ between the Valle area and the Vara flat. A study was also made to see whether the cardinal direction the ecotones lie in have an impact on the invertebrate fauna or not. None of the tests made showed any statistically significant difference between the Valle area and the Vara flat. Nor was there any statistically significant difference in invertebrate fauna depending on cardinal direction of the ecotone. Nevertheless, there are indications that the areas differ in invertebrate fauna and number of tree individuals. 

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    Examensarbete - Johanna Blomstrand
  • 7.
    Borrvall, Charlotta
    et al.
    Linköping University.
    Ebenman, Bo
    Linköping University.
    Jonsson, Tomas
    Linköping University.
    Biodiversity lessens the risk of cascading extinction in model food webs2000In: Ecology Letters, ISSN 1461-023X, E-ISSN 1461-0248, Vol. 3, p. 131-136Article in journal (Refereed)
    Download full text (pdf)
    fulltext
  • 8.
    Boström, Marja L.
    et al.
    Aquatic Ecology, Department of Biology, Lund University, Lund, Sweden.
    Ugge, Gustaf
    Aquatic Ecology, Department of Biology, Lund University, Lund, Sweden.
    Jönsson, Jan Åke
    Centre for Analysis and Synthesis, Department of Chemistry, Lund University, Lund, Sweden.
    Berglund, Olof
    Aquatic Ecology, Department of Biology, Lund University, Lund, Sweden.
    Bioaccumulation and Trophodynamics of the Antidepressants Sertraline and Fluoxetine in Laboratory-Constructed, 3-Level Aquatic Food Chains2017In: Environmental Toxicology and Chemistry, ISSN 0730-7268, E-ISSN 1552-8618, Vol. 36, no 4, p. 1029-1037Article in journal (Refereed)
    Abstract [en]

    Although reports of pharmaceutical bioconcentration in aquatic organisms are increasing, less is known about trophic transfer in aquatic food webs. The bioaccumulation and trophodynamics of sertraline and fluoxetine, 2 selective serotonin reuptake inhibitors (SSRIs) frequently detected in aquatic environments, were tested by exposing constructed aquatic food chains to SSRIs under controlled laboratory conditions. Both of these ionizable, weak base pharmaceuticals showed lower bioaccumulation factors (BAFs) with increasing trophic level (i.e., no biomagnifications) in 2 3-level food chains (Acer platanoides, fed to Asellus aquaticus, in turn fed to Notonecta glauca or Pungitius pungitius). Mean sertraline BAFs in A. platanoides, A. aquaticus, N. glauca, and P. pungitus were 2200L/kg, 360L/kg, 26L/kg, and 49L/kg, respectively, and mean fluoxetine BAFs 1300L/kg, 110L/kg, 11L/kg, and 41L/kg, respectively. The weak influence of diet was further demonstrated by measured BAFs being equal to or lower than measured bioconcentration factors (BCFs). Organism lipid content was not positively correlated with BAFs, suggesting that other processes are driving interspecific differences in SSRI bioaccumulation. The empirically derived parameter values were introduced into a proposed bioaccumulation model, and a poor correlation was found between modeled and empirical BAFs (predicted r(2)=-0.63). In conclusion, the apparent lack of biomagnification of these ionizable pharmaceuticals suggests that environmental concern should not necessarily focus only on higher trophic levels, but also on species showing high BCFs at any trophic level.

  • 9.
    Carrelli, Tove
    University of Skövde, School of Life Sciences.
    FÖRSTUDIE OM RESTAURERING AV VÄNGA MOSSE2012Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Vänga bog is one of the six large peat bogs in the Borås municipality which all have high biodiversity. All of these bogs are threatened by encroachment of shrubs and trees. This report presents a study of how the shrubs and trees are invading Vänga bog, and what the possible causes might be.

    A comparison of vegetation via five aerial photos over Vänga bog from 1955, 1964, 1983, 1996 and 2007, was conducted using ArcGIS. Aerial photos are made up of pixels and the method used was to dived the pixels in two values (open ground and shrubs-trees) and then to calculate how the area of shrubs and trees has changed over time. The analysis shows that there was an increase in growth of 43.5% from 1955 to 2007 and that the annual growth varied considerably between the different periods.

    Four factors were examined to determine the possible cause of such changes, namely, temperature, precipitation, atmospheric nitrogen (nitrate and ammonium) and sulphur deposition. The analysis contained within this report shows that temperature, precipitation and nitrogen deposits have a positive correlation to the growth of shrubs and trees. However, sulphur deposition exhibited the strongest correlation, indicating an inhibiting effect on growth of shrubs and trees during the end of the last century. These are new results when sulphur deposition was assumed to be a potential cause of growth of shrubs and trees on bogs in southern Sweden.

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    Restaurering av Vänga Mosse
  • 10.
    Cohen, Joel
    et al.
    The Rockefeller University and Columbia University, New York, USA.
    Jonsson, Tomas
    The Rockefeller University, New York, USA.
    Carpenter, Stephen R.
    Center for Limnology, University of Wisconsin, Madison, USA.
    Ecological community description using the food web, species abundance, and body size2003In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 100, no 4, p. 1781-1786Article in journal (Refereed)
  • 11.
    Ebenman, Bo
    et al.
    Department of Biology, Linköping University, Linköping, Sweden.
    Johansson, Annie
    Department of Biology, Linköping University, Linköping, Sweden.
    Jonsson, Tomas
    Department of Biology, Linköping University, Linköping, Sweden.
    Wennergren, Uno
    Department of Biology, Linköping University, Linköping, Sweden.
    Evolution of stable population dynamics through natural selection1996In: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 263, no 1374, p. 1145-1151Article in journal (Refereed)
  • 12.
    Fant, Sanna
    University of Skövde, School of Life Sciences.
    Uppföljning av hotade och sällsynta växtarter på och kring Mösseberg, Falköping2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Mösseberg is a plateau mountain with an interesting nature and with a great variety of habitats and plant species. In this project the inventory has been performed in meadows, dry grasslands, gullies, scree slopes, wetlands and broad-leaved deciduous forests. This project aims to perform an inventory of 25 threatened and rare plant species in the municipality of Falköping, because of a sub target in the conservation program of Falköping. It is also a follow-up of an honours thesis performed in 2008. The project also surveyed how the plant species status had changed from previous years, what the reason to the changes are and what management actions that can improve the species’ status in the future. Of the 25 focal species that were included in the inventory of 2011, 22 species were found. The highest species richness was found in habitat D, Bestorpskärret, with large amounts of the five focal species that grow here. The results of the inventory in 2011 are both positive and negative. Most focal species were found, some species have increased in number and a small number was not found at all. Some species occur in very small numbers.

    According to Västergötlands Flora (Bertilsson et al 2002) the greatest threats today are overgrowth, eutrophication, pesticides, draining and acidification. Examples of these have been seen during the inventory, especially over-growth due to un-managed meadows and eutrophication. Also, some of the populations are quite small. There are a number of problems with small populations, like decreased adaptability and survivability.

    The future of threatened vascular plant species in Falköping vary from habitat to habitat. Some areas are prioritized and managed very well while others are threatened by overgrowth. If management recommendations are followed, the probability for a positive change is quite high for several species. But some plant populations are so small that the future of these is critical even if management recommendations are followed. In Falköping, the economy and the distribution of resources is limiting for conservation and management actions. Management actions would also be better if the team carrying out the work had more knowledge about the nature and specific needs of the species. 

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    fulltext
  • 13.
    Freij, Mathilda
    University of Skövde, School of Bioscience.
    Restaureringens roll gällande Hornborgasjöns förmåga till kväve- och fosforretention2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today Lake Hornborga is one of Europe’s most important bird lakes but that has not always been the case. Before natural and cultural conservation interests were given credit the lake was drained in favor of agricultural purposes and left to overgrow. The lake was restored in the early 90’s which meant an increased area and higher water levels in the lake.

     

    The water quality of the lake has been regularly tested in both the inlets and the outlet. This report sought to use some of this data to examine the retention of nitrogen and phosphorus in the lake, as well as the changes in retention due to the restauration. This was made by using the mean differences between the inlets and the outlet. The mean difference will indicate if less content is pouring out of the lake than in to the lake.

     

    The analysis shows that the mean differences in total nitrogen between the inlets and the outlet have increased after the restauration. No distinction can be shown in most of the tests regarding the mean differences in total phosphorus. In fact one of the tests shows that the mean differences in total phosphorus between the inlets and the outlet have significantly decreased. These results indicates that the restauration of Lake Hornborga have increased its ability to reduce contents of nitrogen but not phosphorus. However, more comprehensive studies with more accurate methods are needed to prove these results.

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    Restaureringens roll gällande Hornborgasjöns förmåga till kväve- och fosforretention
  • 14.
    Gagic, Vesna
    et al.
    Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Bartomeus, Ignasio
    Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden / Departamento de Ecología Integrativa, Estación Biológica de Doñana (EBD-CSIC), Sevilla, Spain.
    Jonsson, Tomas
    Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Taylor, Astrid
    Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Winqvist, Camilla
    Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Fischer, Christina
    Department of Ecology and Ecosystem Management, Technische Universität München, Restoration Ecology, Germany.
    Slade, Eleanor M.
    Department of Zoology, University of Oxford, Oxford, UK.
    Steffan-Dewenter, Ingolf
    Department of Animal Ecology and Tropical Biology, Biocentre, University of Würzburg, Würzburg, Germany.
    Emmerson, Mark
    School of Biological Sciences, Queen's University Belfast, Medical Biology Centre, Belfast, UK.
    Potts, Simon G.
    School of Agriculture, Policy and Development, Reading University, Reading, UK.
    Tscharntke, Teja
    Department of Agroecology, University of Göttingen, Göttingen, Germany.
    Weisser, Wolfgang
    Terrestrial Ecology Research Group, Department of Ecology and Ecosystem Management, Center for Food and Life Sciences Weihenstephan, Technische Universität München, Freising, Germany.
    Bommarco, Riccardo
    Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Functional identity and diversity of animals predict ecosystem functioning better than species-based indices2015In: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 282, no 1801, article id UNSP 20142620Article in journal (Refereed)
  • 15.
    Hardisty, Alex R.
    et al.
    Cardiff Univ, Sch Comp Sci & Informat, Queens Bldg,5 Parade, Cardiff CF24 3AA, S Glam, Wales, United Kingdom.
    Bacall, Finn
    Univ Manchester, Sch Comp Sci, Kilburn Bldg,Oxford Rd, Manchester M13 9PL, Lancs, England, United Kingdom.
    Beard, Niall
    Univ Manchester, Sch Comp Sci, Kilburn Bldg,Oxford Rd, Manchester M13 9PL, Lancs, England, United Kingdom.
    Balcázar-Vargas, Maria-Paula
    Univ Amsterdam, IBED, POB 94248, NL-1090 Amsterdam, Netherlands.
    Balech, Bachir
    Natl Res Council CNR, Inst Biomembranes & Bioenerget IBBE, Via Amendola 165-A, I-70126 Bari, Italy.
    Barcza, Zoltán
    Eotvos Lorand Univ, Dept Meteorol, Pazmany Setany 1-A, H-1117 Budapest, Hungary.
    Bourlat, Sarah J.
    Univ Gothenburg, Dept Marine Sci, Box 463, S-40530 Gothenburg, Sweden.
    De Giovanni, Renato
    Ctr Referencia Informacao Ambiental, Ave Dr Romeu Tortima 388, BR-13084791 Campinas, SP, Brazil.
    de Jong, Yde
    Univ Amsterdam, IBED, POB 94248, NL-1090 Amsterdam, Netherlands / Univ Eastern Finland, SIB Labs, Joensuu Sci Pk,POB 111, Joensuu 80101, Finland.
    De Leo, Francesca
    Natl Res Council CNR, Inst Biomembranes & Bioenerget IBBE, Via Amendola 165-A, I-70126 Bari, Italy.
    Dobor, Laura
    Eotvos Lorand Univ, Dept Meteorol, Pazmany Setany 1-A, H-1117 Budapest, Hungary.
    Donvito, Giacinto
    Ist Nazl Fis Nucl, Inst Nucl Phys, Via E Orabona 4, I-70125 Bari, Italy.
    Fellows, Donal
    Univ Manchester, Sch Comp Sci, Kilburn Bldg,Oxford Rd, Manchester M13 9PL, Lancs, England.
    Guerra, Antonio Fernandez
    Max Planck Inst Marine Microbiol, Celsiusstr 1, D-28359 Bremen, Germany / Jacobs Univ Bremen GmbH, Campus Ring 1, D-28359 Bremen, Germany.
    Ferreira, Nuno
    Stichting EGI Eu, Sci Pk 140, NL-1098 Amsterdam, Netherlands.
    Fetyukova, Yuliya
    Univ Eastern Finland, SIB Labs, Joensuu Sci Pk,POB 111, Joensuu 80101, Finland.
    Fosso, Bruno
    Natl Res Council CNR, Inst Biomembranes & Bioenerget IBBE, Via Amendola 165-A, I-70126 Bari, Italy.
    Giddy, Jonathan
    Cardiff Univ, Sch Comp Sci & Informat, Queens Bldg,5 Parade, Cardiff CF24 3AA, S Glam, Wales.
    Goble, Carole
    Univ Manchester, Sch Comp Sci, Kilburn Bldg,Oxford Rd, Manchester M13 9PL, Lancs, England.
    Güntsch, Anton
    Free Univ Berlin, Bot Garden & Bot Museum Berlin, Konigin Luise Str 6-8, D-14195 Berlin, Germany.
    Haines, Robert
    Univ Manchester, IT Serv, Kilburn Bldg,Oxford Rd, Manchester M13 9PL, Lancs, England, United Kingdom.
    Hernández Ernst, Vera
    Fraunhofer Inst Intelligent Anal & Informat Syst, D-53757 St Augustin, Germany.
    Hettling, Hannes
    Nat Biodivers Ctr, Postbus 9517, NL-2300 Leiden, Netherlands.
    Hidy, Dóra
    Szent Istvan Univ, MTASZIE Plant Ecol Res Grp, Pater Ku 1, H-2103 Godollo, Hungary.
    Horváth, Ferenc
    Hungarian Acad Sci, Ctr Ecol Res, Inst Ecol & Bot, Alkotmany U 2-4, H-2163 Vacratot, Hungary.
    Ittzés, Dóra
    Hungarian Acad Sci, Ctr Ecol Res, Inst Ecol & Bot, Alkotmany U 2-4, H-2163 Vacratot, Hungary.
    Ittzés, Péter
    Hungarian Acad Sci, Ctr Ecol Res, Inst Ecol & Bot, Alkotmany U 2-4, H-2163 Vacratot, Hungary.
    Jones, Andrew
    Cardiff Univ, Sch Comp Sci & Informat, Queens Bldg,5 Parade, Cardiff CF24 3AA, S Glam, Wales.
    Kottmann, Renzo
    Max Planck Inst Marine Microbiol, Celsiusstr 1, D-28359 Bremen, Germany.
    Kulawik, Robert
    Fraunhofer Inst Intelligent Anal & Informat Syst, D-53757 St Augustin, Germany.
    Leidenberger, Sonja
    Swedish Univ Agr Sci, Swedish Species Informat Ctr ArtDatabanken, Backlasavagen 10, S-75007 Uppsala, Sweden.
    Lyytikäinen-Saarenmaa, Päivi
    Univ Helsinki, Dept Forest Sci, POB 27, FIN-00014 Helsinki, Finland.
    Mathew, Cherian
    Free Univ Berlin, Bot Garden & Bot Museum Berlin, Konigin Luise Str 6-8, D-14195 Berlin, Germany.
    Morrison, Norman
    Univ Manchester, Sch Comp Sci, Kilburn Bldg,Oxford Rd, Manchester M13 9PL, Lancs, England, United Kingdom.
    Nenadic, Aleksandra
    Univ Manchester, Sch Comp Sci, Kilburn Bldg,Oxford Rd, Manchester M13 9PL, Lancs, England, United Kingdom.
    Nieva de la Hidalga, Abraham
    Cardiff Univ, Sch Comp Sci & Informat, Queens Bldg,5 Parade, Cardiff CF24 3AA, S Glam, Wales, United Kingdom.
    Obst, Matthias
    Univ Gothenburg, Dept Marine Sci, Box 463, S-40530 Gothenburg, Sweden.
    Oostermeijer, Gerard
    Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, PO Box 94248, 1090 Amsterdam, The Netherlands.
    Paymal, Elisabeth
    FRB, 195 Rue St Jacques, F-75005 Paris, France.
    Pesole, Graziano
    Institute of Biomembranes and Bioenergetics (IBBE), National Research Council (CNR), via Amendola 165/A, 70126 Bari, Italy / Department of Biosciences, Biotechnology and Biop‑ harmaceutics, University of Bari “A. Moro”, via Orabona, 1514, 70126 Bari, Italy.
    Pinto, Salvatore
    Stichting EGI (EGI.eu), Science Park 140, 1098 Amsterdam, The Netherlands.
    Poigné, Axel
    Fraunhofer Inst Intelligent Anal & Informat Syst, D-53757 St Augustin, Germany.
    Quevedo Fernandez, Francisco
    Cardiff Univ, Sch Comp Sci & Informat, Queens Bldg,5 Parade, Cardiff CF24 3AA, S Glam, Wales, United Kingdom.
    Santamaria, Monica
    Natl Res Council CNR, Inst Biomembranes & Bioenerget IBBE, Via Amendola 165-A, I-70126 Bari, Italy.
    Saarenmaa, Hannu
    SIB Labs, Joensuu Sci‑ ence Park, University of Eastern Finland, P.O. Box 111, 80101 Joensuu, Finland.
    Sipos, Gergely
    Stichting EGI Eu, Sci Pk 140, NL-1098 Amsterdam, Netherlands.
    Sylla, Karl-Heinz
    Fraunhofer Inst Intelligent Anal & Informat Syst, D-53757 St Augustin, Germany.
    Tähtinen, Marko
    Univ Helsinki, Finnish Museum Nat Hist, POB 17, FIN-00014 Helsinki, Finland.
    Vicario, Saverio
    Natl Res Council CNR, Inst Biomed Technol ITB, Via Amendola 122-D, I-70126 Bari, Italy.
    Aldo Vos, Rutger
    Univ Amsterdam, IBED, POB 94248, NL-1090 Amsterdam, Netherlands / Nat Biodivers Ctr, Postbus 9517, NL-2300 Leiden, Netherlands.
    Williams, Alan R.
    Univ Manchester, Sch Comp Sci, Kilburn Bldg,Oxford Rd, Manchester M13 9PL, Lancs, England, United Kingdom.
    Yilmaz, Pelin
    Max Planck Inst Marine Microbiol, Celsiusstr 1, D-28359 Bremen, Germany.
    BioVeL: a virtual laboratory for data analysis and modelling in biodiversity science and ecology2016In: BMC Ecology, ISSN 1472-6785, E-ISSN 1472-6785, Vol. 16, article id 49Article in journal (Refereed)
    Abstract [en]

    Background: Making forecasts about biodiversity and giving support to policy relies increasingly on large collections of data held electronically, and on substantial computational capability and capacity to analyse, model, simulate and predict using such data. However, the physically distributed nature of data resources and of expertise in advanced analytical tools creates many challenges for the modern scientist. Across the wider biological sciences, presenting such capabilities on the Internet (as "Web services") and using scientific workflow systems to compose them for particular tasks is a practical way to carry out robust "in silico" science. However, use of this approach in biodiversity science and ecology has thus far been quite limited. Results: BioVeL is a virtual laboratory for data analysis and modelling in biodiversity science and ecology, freely accessible via the Internet. BioVeL includes functions for accessing and analysing data through curated Web services; for performing complex in silico analysis through exposure of R programs, workflows, and batch processing functions; for on- line collaboration through sharing of workflows and workflow runs; for experiment documentation through reproducibility and repeatability; and for computational support via seamless connections to supporting computing infrastructures. We developed and improved more than 60 Web services with significant potential in many different kinds of data analysis and modelling tasks. We composed reusable workflows using these Web services, also incorporating R programs. Deploying these tools into an easy-to-use and accessible 'virtual laboratory', free via the Internet, we applied the workflows in several diverse case studies. We opened the virtual laboratory for public use and through a programme of external engagement we actively encouraged scientists and third party application and tool developers to try out the services and contribute to the activity. Conclusions: Our work shows we can deliver an operational, scalable and flexible Internet-based virtual laboratory to meet new demands for data processing and analysis in biodiversity science and ecology. In particular, we have successfully integrated existing and popular tools and practices from different scientific disciplines to be used in biodiversity and ecological research.

  • 16.
    Hedlin, Emelie
    University of Skövde, School of Life Sciences.
    Påverkan på stormusslors (Unionoida) miljö som kan motverka livskraftiga bestånd: En studie över redoxförhållanden och kantzoners sammansättning i fyra vattensystem i Västra Götalands län2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Freshwater mussels, who have a central role in aquatic ecosystems, are considered one of the most vulnerable and threatened freshwater organism groups. Sweden has nine species of large freshwater mussels, which of four are listed in the national Red List. Most studies and research have been focused on the freshwater pearl mussel (Margaritifera margaritifera) and its possible threats. Studies of more common species like the duck mussel (Anodonta anatina) and swollen river mussel (Unio tumidus) in Västra Götaland district, indicates severe difficulties of recruitment and viable populations. The most vulnerable phase in the life of freshwater mussels is considered to be the juvenile phase, when they are embedded in the sediment.

    The aim of this study has been to measure the quality of sediments at 12 of the earlier studied sites in Västra Götaland district. Redox potentials, which is a master variable in aquatic ecosystems and control parts of the chemistry in sediments, have been measured to analyze a possible correlation to the poor recruitment. The structure of the riparian buffer zones of the mussel’s unique catchment areas, have also been analyzed. The buffer zones are closely linked to the sediment ecosystems and have a fundamental role in the function of the ecosystems of streams.

    Analysis of regression trees indicated the most impacting factor on the mussel density, to be the difference of the mean redox value between the sediment surface and the depth of five centimeters. The variable with most impact on the recruitment was the proportion of area between catchment and lake. A none-parametric test showed a positive correlation between the proportion of marshes in the riparian buffer zone and the recruitment of A. anatina. A negative correlation existed between the proportion of young forests in the buffer zone and the recruitment of U. tumidus.

    More extended studies of redox potentials than was possible in this thesis, could contribute with valuable information of the quality of juvenile habitat. Further studies of the freshwater mussels could facilitate the evaluation of viable populations.

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  • 17.
    Henriksson, Frida
    University of Skövde, School of Life Sciences.
    Ålder vid reproduktion hos den allmänna dammusslan (Anodonta anatina)2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Molluscs (Mollusca) belong to one of the most threatened taxonomic groups in the world and mussels (Bivalvia) have been observed to drastically decrease. The reduced growth of the mussel population may depend on factors such as decrease of the host fishes, acidification, invasive species, pollution and siltation of the seabed. All species of large mussels (Unionoida) are sensitive to eutrophication and physical changes in their habitat and can thus be used as indicators of territories with high conservation value or as an indicator of the chemical quality of the water. For a mussel population to be viable it requires a mean the proportion of juveniles (rejuvenation) in the population between 10 to 20 percentages. In Västra Götaland country only half of the previously 33 studied populations show satisfactory rejuvenation. When a mussel is considered to be a juvenile or adult is contentious. Today there are few studies on age at maturity of unionid mussels. Most often estimated values or knowledge of other species age at maturity is used. This work aims to investigate the growth of Anodonta anatina. Growth was measured as the differences in the distance between growth rings on each of the mussel individuals shell. With the annual growth rings an exponential growth rate was calculated that indicated the year in which most of the individuals slowed their growth. The breaking point was found using Von Bertalanffys growth model which indicates growths over time. Knowing the age at which most mussels slows their growth can give us a conclusion of possible age when sexual maturity occurs. The conclusion can be made upon the knowing that an individual starts to allocate the amount of energy available to more features than growth, where reproduction is the most likely. It is important to know the age at which spices reaches sexual maturity due to conservation purposes. A clam is considered very sensitive in its juvenile years. The result in this study shows that growth is slowing at the age of 4 years for one of the studied lakes. In the other two studied, the growth slowed before the mussel attained the age of 3 years. The age at which growth slows differ between lakes and may due to that natural conditions in lakes are various favorable.        

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  • 18.
    Hinrichsen, Hans-Harald
    et al.
    Dept. Evolutionary Ecology, Kiel, Germany.
    Large, Scott
    International Council for the Exploration of the Sea (ICES), Copenhagen, Denmark.
    Möllmann, Christian
    University of Hamburg, Institute of Hydrobiology and Fishery Science, Hamburg, Germany.
    Müller-Karulis, Bärbel
    Stockholm University, Baltic Sea Centre, Stockholm, Sweden.
    Neuenfeldt, Stefan
    Technical University of Denmark, National Institute of Aquatic Resources, Section for Marine Ecology and Oceanography, Charlottenlund, Denmark.
    Norrström, Niclas
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Schmidt, Jörn
    Christian-Albrechts-Universität zu Kiel, Department of Economics, Kiel, Germany.
    Sguotti, Camilla
    Institute for Hydrobiology and Fisheries Science, University of Hamburg, Hamburg, Germany.
    Tomczak, Maciej
    Stockholm University, Baltic Sea Centre, Stockholm, Sweden.
    Voss, Rudi
    Christian-Albrechts-Universität zu Kiel, Department of Economics, Kiel, Germany.
    Hamrén, Henrik
    Stockholm University, Baltic Sea Centre, Stockholm, Sweden.
    Report of the Workshop on DEveloping Integrated AdviCE for Baltic Sea ecosystem-based fisheries management (WKDEICE): 18-21 April 2016 Helsinki, Finland2016Report (Other academic)
    Abstract [en]

    The first ICES Workshop on DEveloping Integrated AdviCE for Baltic Sea ecosystem-based fisheries management (WKDEICE) had the aim to start identifying and devel-oping ways to include environmental and economic considerations into ICES advice on Baltic Sea fish stocks. The WKDEICE meeting was held in Helsinki, Finland, on18–21 April 2016, with 12 participants from three countries and was chaired by Chris-tian Möllmann (Germany), Rudi Voss (Germany), and Maciej T. Tomczak (Sweden). Focusing on Eastern Baltic cod (subdivisions 25-32), WKDEICE addressed five main topics:

    1)developing a strategy for integrating environmental and economic infor-mation in fish stock advice;

    2)conducting an integrated environmental assessment;

    3)conducting a socio-economic assessment;

    4)conducting short-term projections informed by environmental and economic conditions; and

    5)communicating the approach and the results.

    Eastern Baltic cod has been selected as a case study. The exercise will likely be ex-tended to the baltic clupeid stocks of herring and sprat.

    A central point of the meeting was to discuss and design a concept of operationalized Integrated Ecosystem Assessment (IEA) including short-term predictions, to be used in advice on the main Baltic Sea fish stocks. The group developed an operational strategy, and started to quantify potentially useful environmental indicators, focusing on hydrographic conditions influencing cod recruitment. Economic short-term fore-casts were established to include the human dimension, and to provide additional quantitative information on fishing options. The suggested integrated advice frame-work will be further developed using simulation modelling during a next meeting in 2017. This meeting will be coordinated with the ICES/HELCOM Working Group on Integrated Assessments of the Baltic Sea (WGIAB) and the Baltic Fisheries Assess-ment Working Group (WGBFAS) to test concepts, apply Management Strategy Eval-uation (MSE) models, and have direct feedback for relevant ICES bodies. 

  • 19.
    Holmgren, Noél
    University of Skövde, School of Life Sciences.
    Coupled dynamics of lemmings and long-distance migratory birds2004In: Biological Resources and Migration / [ed] Dietrich Werner, Springer Berlin/Heidelberg, 2004, p. 219-228Conference paper (Refereed)
  • 20.
    Holmgren, Noél
    et al.
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Norrström, Niclas
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Aps, Robert
    University of Tartu, Estonia.
    Kuikka, Sakari
    University of Helsinki, Finland.
    A Concept of Bayesian Regulation in Fisheries Management2014In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 9, no 11, article id e111614Article in journal (Refereed)
    Abstract [en]

    Stochastic variability of biological processes and uncertainty of stock properties compel fisheries managers to look for tools to improve control over the stock. Inspired by animals exploiting hidden prey, we have taken a biomimetic approach combining catch and effort in a concept of Bayesian regulation (BR). The BR provides a real-time Bayesian stock estimate, and can operate without separate stock assessment. We compared the performance of BR with catch-only regulation (CR), alternatively operating with N-target (the stock size giving maximum sustainable yield, MSY) and F-target (the fishing mortality giving MSY) on a stock model of Baltic Sea herring. N-targeted BR gave 3% higher yields than F-targeted BR and CR, and 7% higher yields than N-targeted CR. The BRs reduced coefficient of variance (CV) in fishing mortality compared to CR by 99.6% (from 25.2 to 0.1) when operated with F-target, and by about 80% (from 158.4 to 68.4/70.1 depending on how the prior is set) in stock size when operated with N-target. Even though F-targeted fishery reduced CV in pre-harvest stock size by 19–22%, it increased the dominant period length of population fluctuations from 20 to 60–80 years. In contrast, N-targeted BR made the periodic variation more similar to white noise. We discuss the conditions when BRs can be suitable tools to achieve sustainable yields while minimizing undesirable fluctuations in stock size or fishing effort.

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  • 21.
    Howell, Daniel
    et al.
    Institute of Marine Research, Nordnes, Norway.
    Kempf, Alexander
    Thuenen Institute of Sea Fisheries, Hamburg, Germany.
    Bauer, Barbara
    Baltic Sea Centre, Stockholm, Sweden.
    Belgrano, Andrea
    Swedish University of Agricultural Sciences, Department of Aquatic Resources, Institute of Marine Research, Lysekil, Sweden.
    Thorpe, Robert
    Centre for Environment, Fisheries and Aquaculture Science (CEFAS), Suffolk, United Kingdom.
    Vinther, Morten
    DTU-Aqua, Charlottenlund, Denmark.
    Bartolino, Valerio
    Swedish University of Agricultural Sciences, Department of Aquatic Resources, Lysekil, Sweden.
    Pope, John
    NRC (Europe) Ltd.
    Lehuta, Sigrid
    French Institute of Research for the Exploitation of the sea (Ifremer), Nantes, France.
    Gaichas, Sarah
    NOAA Northeast Fisheries Science Center, Woods Hole, USA.
    Lucey, Sean
    Dept. of Commerce/NOAA/NMFS Northeast Fisheries Science Center, Woods Hole, USA.
    Norrström, Niclas
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Spence, Michael
    Department of Animal and Plant Sciences, Sheffield, United Kingdom.
    Holmgren, Noél
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Villanueva, Ching
    French Institute of Research for the Exploitation of the Sea (Ifremer), Nantes, France.
    Poos, Jan Jaap
    Wageningen Marine Research, Ijmuiden, the Netherlands.
    Kulatska, Nataliia
    Swedish University of Agricultural Sciences, Department of Aquatic Resources, Institute of Marine Research, Lysekil, Sweden.
    Report of the Working Group on Multispecies Assessment Methods (WGSAM), 10-14 October 2016, Reykjavik, Iceland2017Report (Other academic)
    Abstract [en]

    The Working Group on Multispecies Assessment Methods (WGSAM) met in Reykjavik, Iceland, 10–14 October 2016. In this tenth report of the pan-regional WGSAM, work focused on four (B, E, F, G) of the multi-annual ToRs.

    Based on their knowledge, participants provided an updated inventory of progress of multispecies models in ICES Ecoregions (ToR A), noting those regions where no information was available. Reporting on ToR A was scarce compared to previous years, partly because recent relevant work was reported against ToR E and G instead.

    A Key Run (ToR B) of the Baltic Sea Ecopath with Ecosim (NS-EwE) model was presented and reviewed in detail by 4 WGSAM experts, and approved by the group following implementation of changes agreed in plenary at the meeting and verified by the 4 experts in January. The Key Run is documented in a detail in Annex 3, with key outputs summarised in Section 3 and data files made available on the WGSAM webpage). WGSAM also conducted an informal review of the LeMans modelling framework for potential application in the Irish Sea, and recommended adjustments to the framework for further review. Because the LeMans framework is a within-model ensemble addressing parameter uncertainty, this review also related to ToR D.

    Multispecies model skill assessment (ToR C) and multi-model ensemble methods (ToR D) were not emphasized this year. However, plans were made to coordinate future work for ToR C, and one ToR D presentation reviewed the utility of a dynamic multimodel ensemble for making inferences about the real world. This method can infer results for individual components of aggregate groups; the ensemble model uses correlations in other ecosystem models to determine what the models that group species would have predicted for individual species. A proof of concept for the North Sea was presented.

    Ecosystem indicator analyses (ToR E) were presented from a wide range of ecosystems. A theoretical analysis comparing results from the Celtic and North Seas with 4 “idealized” fleets was presented to analyse the performance of selected indicators in a multispecies mixed fishery. Four indicators including the Large Fish Indicator (LFI) were examined, and shown to have mixed utility in measuring the impact of different fleet sectors, with the best indicator varying by ecosystem. A multivariate analysis of ecosystem responses to multiple drivers was conducted for four US ecosystems using gradient forest method to identify potential ecosystem thresholds. Other multivariate methods were reviewed that draw on the strengths of multiple indicators for the Northeast US shelf ecosystem. A food web based biodiversity indicator was presented with an application for the Baltic Sea. This could be extended to any ecosystem with an EwE or similar model. A community status indicator relating a species-area relationship to the LFI and mean trophic levels was presented for the Swedish west coast.

    Impacts of apex predators on fisheries (ToR F) were examined with one presentation and a group discussion planning further work. A multipecies production model was parameterized to simulate interactions between three fish guilds, fisheries, and one marine mammal guild, concluding that fish reference points and trajectories change with marine mammal interactions. Fishery management was also important to reduce vessel interactions with and ensure prey supply to marine mammals. 4 | ICES WGSAM REPORT 2016 Exploration of practical advice for fisheries management incorporating multispecies, mixed fishery, and environmental factors (ToR G) was evident across regions. Two approaches for incorporating species, fleet, environmental, and other interactions are in progress in the Northeast US. One presentation outlined the New England approach, and another outlined the Mid-Atlantic approach. In New England, a management strategy evaluation is in progress to evaluate harvest control rules that consider herring's role as forage in the ecosystem. The modelling framework and stakeholder workshops were discussed. In the Baltic, a Nash Equilibrium optimisation approach incorporating environmental factors was presented for the cod-herring-sprat fishery to attempt to identify a solution that would give good yield for all species simultaneously. In the North Sea a theoretical analysis using 4 “idealized” fleets was presented to analyse the potential implications of "Pretty Good Yield" ranges around MSY. The model examined the likelihood of the fishery being precautionary for the different species given the uncertainties involved, and concluded that the upper ends of MSY ranges would not guarantee precautionarity.

  • 22.
    Höglind, Linnéa
    University of Skövde, School of Bioscience.
    Grönfläckig padda - Tillväxt och metamorfos hos yngel2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this work a hypothesis was tested that says tadpoles of green toad (Bufo viridis) may secrete a certain chemical substance in the water to inhibit the growth of other tadpoles. The hypothesis was based on an Australian study by Crossland & Shine (2012). They did a study on tadpoles of cane toads (Rhinella marina) where they discovered that the tadpoles produce a waterborne chemical in the water that inhibits growth. The idea of using a group with only siblings and a group of tadpoles from several females came from the knowledge that there is something called ”kin recognition" , which tests have shown that there are species with pheromones that can recognize closely related individuals ( Devall et al. 1986). By comparing the two groups of tadpoles where one group lived with only their siblings and the other group lived with tadpoles from all the females in the experiment, we were able to compare the growth in length and weight between the groups. After ten weeks, statistical analyses were done on the results. Before the tadpoles had gone through metamorphosis the tadpole’s length was measured and after metamorphosis the tadpoles instead was weighed. The results showed that there were differences in length but no significant differences in weight between the groups. The group with only siblings showed better growth in length and that could be because they can afford to spend energy on becoming longer and thus have advantage during metamorphosis. The group that lived with tadpoles from all the females perhaps adds more energy to grow in weight and thus have an advantage during metamorphosis.

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    Grönfläckig padda
  • 23.
    Iinatti, Sara
    University of Skövde, School of Bioscience.
    En modell som förutsäger naturlig skogstyp utifrån geografik information2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sweden is covered by 60 % forestland, and most of it is used in forestry. There is a debate about the forestry methods in Sweden, where clear felling is the most commonly used practice, and alternate methods are being developed. Some of these methods, for example the Lübeck model, is focused on producing the best suited forest for a site, based on the environmental conditions. That forest would probably be of the natural forest type of that location.

    With this study a model is developed to predict natural forest types based on easily available GIS-data and without using remote sensing. Remote sensing is not considered to be useful in this particular case, since only the already existing vegetation can be analyzed using that method. Existing forests are likely to have been planted, and does not necessarily correspond to the type of vegetation that would develop, were there no human impact.

    The study was conducted by using forested areas that could be assumed to be natural (within nature reserves and other protected areas) in Askersund municipality, Örebro county, Sweden. An additive Generalized Linear Model (GZLM) has been used, and the prediction is based on soil, bedrock, elevation data and ground water data.

    The results from the first test, based on the training points on which the model was built, and the validation based on new, independent points from different forest areas, differ. The first test indicate that prediction works well for several of the forest types, while the validation gives the opposite results and shows that the prediction does not actually work.

    If the model was further developed and would become a working tool, it could make forest management easier and more effective, for example when continuous forestry is carried out. Field work could be concentrated to areas where the forest has been predicted to be of desired type.

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    En modell som förutsäger naturlig skogstyp utifrån geografisk information
  • 24.
    Jacob, Ute
    et al.
    Institute for Hydrobiology and Fisheries Science, University of Hamburg, Hamburg, Germany.
    Jonsson, Tomas
    Population Ecology Unit, Institute for Ecology, Uppsala, Sweden.
    Berg, Sofia
    EnviroPlanning AB, Göteborg, Sweden.
    Brey, Thomas
    Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany.
    Eklöf, Anna
    Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, Sweden.
    Mintenbeck, Katja
    Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany.
    Möllmann, Christian
    Institute for Hydrobiology and Fisheries Science, University of Hamburg, Hamburg, Germany.
    Morissette, Lyne
    M-Expertise Marine, Sainte-Luce, Canada.
    Rau, Andrea
    Johann Heinrich von Thünen Institute for Baltic Sea Fisheries, Rostock, Germany.
    Petchey, Owen
    Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland.
    Valuing biodiversity and ecosystem services in a complex marine ecosystem2015In: Aquatic Functional Biodiversity: An Ecological and Evolutionary Perspective / [ed] Andrea Belgrano, Guy Woodward, Ute Jacob, London: Academic Press, 2015, p. 189-207Chapter in book (Refereed)
  • 25.
    Jacob, Ute
    et al.
    University of Hamburg, Inst Hydrobiol & Fisheries Sci, Hamburg, Germany.
    Thierry, Aaron
    University of Sheffield, Dept Anim & Plant Sci, Western Bank, Sheffield S10 2TN, S Yorkshire, England / Microsoft Res, Cambridge, England.
    Brose, Ulrich
    Georg-August University Göttingen JF Blumenbach Inst Zool & Anthropol, Syst Conservat Biol Grp, Göttingen, Germany.
    Arntz, Wofe E.
    Alfred Wegener Inst Polar & Marine Res, Bremerhaven, Germany.
    Berg, Sofia
    University of Skövde, School of Life Sciences. University of Skövde, The Systems Biology Research Centre.
    Brey, Thomas
    Alfred Wegener Institute for Polar and Marine Research.
    Fetzer, Ingo
    UFZ Helmholtz Ctr Environm Res, Dept Environm Microbiol, Leipzig, Germany.
    Jonsson, Tomas
    University of Skövde, School of Life Sciences. University of Skövde, The Systems Biology Research Centre.
    Mintenbeck, Katja
    Alfred Wegener Inst Polar & Marine Res, Bremerhaven, Germany.
    Möllmann, Christian
    Univ Hamburg, Inst Hydrobiol & Fisheries Sci, Hamburg, Germany.
    Petchey, Owen
    Univ Zurich, Inst Evolutionary Biol & Environm Studies, Zurich, Switzerland.
    Riede, Jens O.
    Univ Gottingen, JF Blumenbach Inst Zool & Anthropol, Syst Conservat Biol Grp, Gottingen, Germany.
    Dunne, Jennifer A.
    Santa Fe Inst, Santa Fe, NM 87501 USA / Pacific Ecoinformat & Computat Ecol Lab, Berkeley, CA USA.
    The Role of Body Size in Complex Food Webs: A Cold Case2011In: Advances in Ecological Research, ISSN 0065-2504, E-ISSN 2163-582X, Vol. 45, p. 181-223Article in journal (Refereed)
    Abstract [en]

    Human-induced habitat destruction, overexploitation, introduction of alien species and climate change are causing species to go extinct at unprecedented rates, from local to global scales. There are growing concerns that these kinds of disturbances alter important functions of ecosystems. Our current understanding is that key parameters of a community (e.g. its functional diversity, species composition, and presence/absence of vulnerable species) reflect an ecological network’s ability to resist or rebound from change in response to pressures and disturbances, such as species loss. If the food web structure is relatively simple, we can analyse the roles of different species interactions in determining how environmental impacts translate into species loss. However, when ecosystems harbour species-rich communities, as is the case in most natural systems, then the complex network of ecological interactions makes it a far more challenging task to perceive how species’ functional roles influence the consequences of species loss. One approach to deal with such complexity is to focus on the functional traits of species in order to identify their respective roles: for instance, large species seem to be more susceptible to extinction than smaller species. Here, we introduce and analyse the marine food web from the high Antarctic Weddell Sea Shelf to illustrate the role of species traits in relation to network robustness of this complex food web. Our approach was threefold: firstly, we applied a new classification system to all species, grouping them by traits other than body size; secondly, we tested the relationship between body size and food web parameters within and across these groups and finally, we calculated food web robustness. We addressed questions regarding (i) patterns of species functional/trophic roles, (ii) relationships between species functional roles and body size and (iii) the role of species body size in terms of network robustness. Our results show that when analyzing relationships between trophic structure, body size and network structure, the diversity of predatory species types needs to be considered in future studies.

  • 26.
    Johansson, Hanna
    University of Skövde, School of Life Sciences.
    Inplantering av fisk och dess påverkan på biologisk mångfald i Hökensåsområdet: En jämförelse av invertebratfauna mellan sjöar2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Pisciculture has been shown to affect biodiversity negatively, e.g. owing to increased nutrient loading and modified genetic set by breeding at other qualities then what is advantageous in in the wild. The purpose of this study was to investigate which impact stocked fish has on the invertebrate fauna and thereby biodiversity. The study is performed at Hökensås area in Västra Götalands län, where there are about 20 lakes included in a sport fishing business. There are seven lakes included in the study; four which yearly became stocked with fish and three non-stocked. By bottom fauna samples invertebrate fauna has been collected, identified, counted and measured. No significant differences have been detected between the lake groups considering diversity index, number of taxa or size of taxa. Nor has significant correlation between amount stocked fish/year- and (a) diversity index, (b) number of taxa been shown. A possible factor that may have affected the result is, from a statistical point of view, the low number of lakes, the varying qualities of the lakes and that the collecting of invertebrate fauna was performed too early in the year than optimal. Strong correlation between number of taxa and grade of acidification was detected.

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    Inplantering av fisk och dess påverkan på biologisk mångfald i Hökensåsområdet
  • 27.
    Jonsson, Annie
    et al.
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Bertilsson, Ann
    Örnborg Kyrkander Biologi och Miljö AB.
    Ökad biologisk mångfald och renare vatten med livskraftiga stormusselbestånd i Göta älvs vattensystem: Dagens situation och åtgärder för att minska vattenkraftens negativa påverkan2016Report (Other academic)
    Abstract [sv]

    Göta älv är Sveriges största vattendrag. Älven används av många olika intressen. Människan utnyttjande av älven påverkar dock vattenekosystemen negativt. Sötvattenslevande stormusslor har drabbats hårt av människans exploatering av vattendrag och mark kring vattendrag. De är betydelsefulla organismer som tillhandahåller flera ekosystemtjänster.

    Projektets första mål har varit att samla in kunskap om alla de stora sötvattensmusselarternas förekomster i Göta älvs vattensystem (biflöden) från Vänern till havet. Det finns stora kunskapsluckor över musslornas förekomster i Sverige, särskilt de mer vanligt förekommande arterna. Projektets andra mål har varit att samla in miljödata och analysera vilka eventuella miljöproblem som påverkar musselförekomsterna i de olika delarna av vattensystemet. Utifrån resultaten har vi diskuterat olika åtgärder och prioriteringar i generella drag och även kort för respektive biflödessystem.

    Resultatet visar att musselförekomsterna är få och svaga. Musslor har påträffats i knappt en tredjedel av de undersökta 201 lokalerna. Musslor har bara påträffats i 10 av de 25 undersökta biflödessystemen. Positivt är dock att fynd har gjorts av alla de fem arterna allmän dammussla, större dammussla, flat dammussla, spetsig målarmussla och flodpärlmussla. Föryngring har också förekommit någonstans i systemet av dessa arter. Alltså har vi möjlighet att handla!

    Projektet har finasierats av Naturskyddsföreningen och Göta älvs vattenvårdsförbund.

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    Musslor i Göta älv
  • 28.
    Jonsson, Annie
    et al.
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Jonsson, Tomas
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Toräng, Per
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Utvärdering av Hornborgasjöns restaurering: måluppfyllelse och effekter på biologisk mångfald med fokus på vegetation och fågelfauna2017Report (Other academic)
    Abstract [sv]

    Hornborgasjön räknas idag som en av Sveriges rikaste fågelsjöar och är internationellt utpekad som en av Sveriges värdefullaste våtmarker. Sjön har stor betydelse som både rast- och häckplats för en mängd fågelarter. Området är också av stort intresse för friluftslivet och som ett levande kulturlandskap. Under de senaste 150 åren har Hornborgasjön genomgått stora förändringar. En serie av sjösänkningar under 1800 och 1900-talen ledde till kraftig igenväxning och följdes av ett storskaligt restaureringsprojekt i senare tid. Syftet med Hornborgasjöns restaurering var att säkerställa Hornborgasjöns framtid som fågelsjö. Restaureringen är ett av Sveriges största naturvårdsprojekt. I denna rapport har vi utvärderat hur Hornborgasjöns restaurering påverkat vegetation och fågelfauna. Syftet var att analysera om och till vilken grad de biologiska målen med restaureringen uppnåtts.För att utvärdera måluppfyllelsen har vi i första hand jämfört olika naturtypers utbredning mellan åren 1905 och 2010 samt förändringar i fågelfaunan under flera tidsperioder. Analyser av vegetationskartor visar att vass- och buskområden kraftigt reducerats och att en stor öppen vattenspegel och omgivande mader återskapats. Våtmarksfåglarnas numerär har generellt sett återhämtat sig från igenväxningsperioden och är för vissa arter till och med större än vid förra sekelskiftet. För vissa naturtyper och fågelarter, som till exempel vassområden och häckande vadare, är dagens situation dock inte i linje med målen. Det står ändå klart att det övergripande målet och många av de mer specifika delmålen har uppfyllts så att Hornborgasjön idag är en levande våtmark med stort antal häckande och rastande fågelarter.I analyser av fågeldata från senare tid finns indikationer på negativa trender som man behöver vara observant på för att för framtiden säkra en biologiskt rik Hornborgasjö. En utmaning för denna utvärdering har dock varit bristen på högkvalitativa och jämförbara data att basera analyserna på. Vi belyser därför vikten av att ha ett fungerande övervakningssystem som kontinuerligt följer upp statusen i ekosystemet.

  • 29.
    Jonsson, Annie
    et al.
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Wennergren, Uno
    Linköping University, Linköpings Universitet.
    Approximations of population growth in a noisy environment: on the dichotomy of non-age and age structure2019In: Theoretical Ecology, ISSN 1874-1738, E-ISSN 1874-1746, Vol. 12, no 1, p. 99-110Article in journal (Refereed)
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  • 30.
    Jonsson, Tomas
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Conditions for Eltonian Pyramids in Lotka-Volterra Food Chains2017In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 10912Article in journal (Refereed)
    Abstract [en]

    In ecological communities consumers (excluding parasites and parasitoids) are in general larger and less numerous than their resource. This results in a well-known observation known as 'Eltonian pyramids' or the ` pyramid of numbers', and metabolic arguments suggest that this pattern is independent of the number of trophic levels in a system. At the same time, Lotka-Volterra (LV) consumer-resource models are a frequently used tool to study many questions in community ecology, but their capacity to produce Eltonian pyramids has not been formally analysed. Here, I address this knowledge gap by investigating if and when LV food chain models give rise to Eltonian pyramids. I show that Eltonian pyramids are difficult to reproduce without density-dependent mortality in the consumers, unless biologically plausible relationships between mortality rate and interaction strength are taken into account.

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  • 31.
    Jonsson, Tomas
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Metabolic theory predicts animal self-thinning2017In: Journal of Animal Ecology, ISSN 0021-8790, E-ISSN 1365-2656, Vol. 86, no 3, p. 645-653Article in journal (Refereed)
    Abstract [en]
    1. The metabolic theory of ecology (MTE) predicts observed patterns in ecology based on metabolic rates of individuals. The theory is influential but also criticized for a lack of firm empirical evidence confirming MTE's quantitative predictions of processes, e.g. outcome of competition, at population or community level.
    2. Self-thinning is a well-known population level phenomenon among plants, but a much less studied phenomenon in animal populations and no consensus exists on what a universal thinning slope for animal populations might be, or if it exists.
    3. The goal of this study was to use animal self-thinning as a tool to test population-level predictions from MTE, by analysing (i) if self-thinning can be induced in populations of house crickets (Acheta domesticus) and (ii) if the resulting thinning trajectories can be predicted from metabolic theory, using estimates of the species-specific metabolic rate of A. domesticus.
    4. I performed a laboratory study where the growth of A. domesticus was followed, from hatching until emergence as adults, in 71 cohorts of five different starting densities.
    5. Ninety-six per cent of all cohorts in the three highest starting densities showed evidence of self-thinning, with estimated thinning slopes in general being remarkably close to that expected under metabolic constraints: A cross-sectional analysis of all data showing evidence of self-thinning produced an ordinary least square (OLS) slope of −1·11, exactly that predicted from specific metabolic allometry of A. domesticus. This result is furthermore supported by longitudinal analyses, allowing for independent responses within cohorts, producing a mean OLS slope across cohorts of −1·13 and a fixed effect linear mixed effects models slope of −1·09. Sensitivity analysis showed that these results are robust to how the criterion for on-going self-thinning was defined. Finally, also as predicted by metabolic theory, temperature had a negative effect on the thinning intercept, producing an estimate of the activation energy identical to that suggested by MTE.
    6. This study demonstrates a direct link between the metabolic rate of individuals and a population-level ecological process and as such provides strong support for research that aims to integrate body mass, via its effect on metabolism, consumption and competition, into models of populations and communities.
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  • 32.
    Jonsson, Tomas
    Swedish University of Agricultural Sciences.
    Trophic links and the relationship between predator and prey body sizes in food webs2014In: Community Ecology, ISSN 1585-8553, Vol. 15, p. 54-64Article in journal (Refereed)
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  • 33.
    Jonsson, Tomas
    et al.
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Berg, Sofia
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. Department of Physics, Chemistry and Biology, Division of Theoretical Biology, Linköping University, Linköping, Sweden.
    Emmerson, Mark
    School of Biological Sciences, Queen's University Belfast, Belfast, UK.
    Pimenov, Alexander
    Environmental Research Institute, University College Cork, Lee Road, Cork, Ireland / Weierstrass Institute, Berlin, Germany.
    The context dependency of species keystone status during food web disassembly2015In: Food Webs, ISSN 2352-2496, Vol. 5, p. 1-10Article in journal (Refereed)
  • 34.
    Jonsson, Tomas
    et al.
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. Dept of Ecology, Swedish Univ. of Agricultural Sciences, Uppsala, Sweden.
    Berg, Sofia
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. Dept of Physics, Chemistry and Biology, Div. of Theoretical Biology, Linköping Univ., Linköping, Sweden.
    Pimenov, Alexander
    Environmental Res. Inst., Univ. College Cork, Cork, Ireland / Weierstrass Inst., Berlin, Germany.
    Palmer, Catherine
    Environmental Res. Inst., Univ. College Cork, Cork, Ireland.
    Emmerson, Mark
    School of Biological Sciences, Queen's Univ. Belfast, Belfast, United Kingdom.
    The reliability of R50 as a measure of vulnerability of food webs to sequential species deletions2015In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 124, no 4, p. 446-457Article in journal (Refereed)
  • 35.
    Jonsson, Tomas
    et al.
    University of Skövde, School of Bioscience. University of Skövde, Systems Biology Research Environment. Department of ecology, Swedish university of agricultural sciences, Sweden / Department of physics, chemistry and biology, Division of theoretical biology, Linköping university, Sweden.
    Berg, Sofia
    University of Skövde, School of Bioscience. University of Skövde, Systems Biology Research Environment. Department of physics, chemistry and biology, Division of theoretical biology, Linköping university, Sweden.
    Säterberg, Torbjörn
    Department of physics, chemistry and biology, Division of theoretical biology, Linköping university, Sweden.
    Hauzy, Céline
    Department of physics, chemistry and biology, Division of theoretical biology, Linköping university, Sweden / UPMC, Ecologie et evolution, France INRA, USC 2031 Ecologie des populations et communautés, France.
    Ebenman, Bo
    Department of physics, chemistry and biology, Division of theoretical biology, Linköping university, Sweden.
    Rare but Important: Perturbations to Uncommon Species Can Have a Large Impact on the Structure of Ecological Communities2017In: Adaptive Food Webs: Stability and Transitions of Real and Model Ecosystems / [ed] John C. Moore, Peter C. de Ruiter, Kevin S. McCann, Volkmar Wolters, Cambridge University Press, 2017, p. 324-341Chapter in book (Refereed)
  • 36.
    Jonsson, Tomas
    et al.
    University of Skövde, School of Life Sciences.
    Cohen, Joel E.
    Carpenter, Stephen R.
    Food webs, body size, and species abundance in ecological community description2005In: Advances in Ecological Research, ISSN 0065-2504, E-ISSN 2163-582X, Vol. 36, p. 1-83Article in journal (Refereed)
  • 37.
    Jonsson, Tomas
    et al.
    Department of Biology, Linköping University, Linköping, Sweden.
    Ebenman, Bo
    Department of Biology, Linköping University, Linköping, Sweden.
    Effects of predator-prey body size ratios on the stability of food chains1998In: Journal of Theoretical Biology, ISSN 0022-5193, E-ISSN 1095-8541, Vol. 193, no 3, p. 407-417Article in journal (Refereed)
  • 38.
    Jonsson, Tomas
    et al.
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Kaartinen, Riikka
    Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Jonsson, Mattias
    Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Bommarco, Riccardo
    Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Predictive power of food web models based on body size decreases with trophic complexity2018In: Ecology Letters, ISSN 1461-023X, E-ISSN 1461-0248, Vol. 21, no 5, p. 702-712Article in journal (Refereed)
    Abstract [en]

    Food web models parameterised using body size show promise to predict trophic interaction strengths (IS) and abundance dynamics. However, this remains to be rigorously tested in food webs beyond simple trophic modules, where indirect and intraguild interactions could be important and driven by traits other than body size. We systematically varied predator body size, guild composition and richness in microcosm insect webs and compared experimental outcomes with predictions of IS from models with allometrically scaled parameters. Body size was a strong predictor of IS in simple modules (r(2)=0.92), but with increasing complexity the predictive power decreased, with model IS being consistently overestimated. We quantify the strength of observed trophic interaction modifications, partition this into density-mediated vs. behaviour-mediated indirect effects and show that model shortcomings in predicting IS is related to the size of behaviour-mediated effects. Our findings encourage development of dynamical food web models explicitly including and exploring indirect mechanisms.

  • 39.
    Jonsson, Tomas
    et al.
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Setzer, Malin
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    A freshwater predator hit twice by effects of warming across trophic levels2015In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 6, article id 5992Article in journal (Refereed)
  • 40.
    Karlsson, David
    University of Skövde, School of Bioscience.
    Uppskattning av nätselektivitet och populationsstruktur av sik (Coregonus spp) i Vättern2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
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  • 41.
    Karlsson, Susanna
    University of Skövde, School of Life Sciences.
    HARR (THYMALLUS THYMALLUS) I VÄTTERBÄCKARNA: En studie om samband mellan bottenfauna och harrens förekomst2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
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    harr
  • 42.
    Kollberg, Ida
    et al.
    Swedish University of Agricultural Sciences, Department of Ecology, Uppsala, Sweden.
    Bylund, H.
    Swedish University of Agricultural Sciences, Department of Ecology, Uppsala, Sweden.
    Jonsson, Tomas
    Swedish University of Agricultural Sciences, Department of Ecology, Uppsala, Sweden.
    Schmidt, A.
    Max Planck Institute for Chemical Ecology, Department of Biochemistry, Jena, Germany.
    Gershenzon, J.
    Max Planck Institute for Chemical Ecology, Department of Biochemistry, Jena, Germany.
    Björkman, C.
    Swedish University of Agricultural Sciences, Department of Ecology, Uppsala, Sweden.
    Temperature affects insect outbreak risk through tritrophic interactions mediated by plant secondary compounds2015In: Ecosphere, ISSN 2150-8925, E-ISSN 2150-8925, Vol. 6, no 6, article id 102Article in journal (Refereed)
  • 43.
    Kotta, Jonne
    et al.
    Estonian Marine Institute, University of Tartu, Tallinn, Estonia.
    Vanhatalo, Jarno
    Department of Mathematics and Statistics and Organismal and Evolutionary Biology Research Program, University of Helsinki, Helsinki, Finland.
    Jänes, Holger
    Estonian Marine Institute, University of Tartu, Tallinn, Estonia / Centre for Integrative Ecology, Deakin University, Melbourne, Victoria, Australia.
    Orav-Kotta, Helen
    Estonian Marine Institute, University of Tartu, Tallinn, Estonia.
    Rugiu, Luca
    Department of Biology, University of Turku, Turku, Finland.
    Jormalainen, Veijo
    Department of Biology, University of Turku, Turku, Finland.
    Bobsien, Ivo
    GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany.
    Viitasalo, Markku
    Finnish Environment Institute, Helsinki, Finland.
    Virtanen, Elina
    Finnish Environment Institute, Helsinki, Finland.
    Nyström Sandman, Antonia
    AquaBiota Water Research, Stockholm, Sweden.
    Isaeus, Martin
    AquaBiota Water Research, Stockholm, Sweden.
    Leidenberger, Sonja
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Jonsson, Per R.
    Department of Marine Sciences – Tjärnö, University of Gothenburg, Tjärnö, Strömstad, Sweden.
    Johannesson, Kerstin
    Department of Marine Sciences – Tjärnö, University of Gothenburg, Tjärnö, Strömstad, Sweden.
    Integrating experimental and distribution data to predict future species patterns2019In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 1821Article in journal (Refereed)
    Abstract [en]

    Predictive species distribution models are mostly based on statistical dependence between environmental and distributional data and therefore may fail to account for physiological limits and biological interactions that are fundamental when modelling species distributions under future climate conditions. Here, we developed a state-of-the-art method integrating biological theory with survey and experimental data in a way that allows us to explicitly model both physical tolerance limits of species and inherent natural variability in regional conditions and thereby improve the reliability of species distribution predictions under future climate conditions. By using a macroalga-herbivore association (Fucus vesiculosus - Idotea balthica) as a case study, we illustrated how salinity reduction and temperature increase under future climate conditions may significantly reduce the occurrence and biomass of these important coastal species. Moreover, we showed that the reduction of herbivore occurrence is linked to reduction of their host macroalgae. Spatial predictive modelling and experimental biology have been traditionally seen as separate fields but stronger interlinkages between these disciplines can improve species distribution projections under climate change. Experiments enable qualitative prior knowledge to be defined and identify cause-effect relationships, and thereby better foresee alterations in ecosystem structure and functioning under future climate conditions that are not necessarily seen in projections based on non-causal statistical relationships alone.

  • 44.
    Larsson, Maria
    University of Skövde, School of Life Sciences.
    Finns det något samband mellan stormusslors (unionoida) föryngring och utsläpp i närheten av dess levnadsmiljö?: en jämförelse mellan vattendrag i Västra Götaland2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Common species of freshwater mussels may, like the freshwater pearl mussel (Margaritifera margaritifera) have a drastic decline in number and there is several reasons, like sedimentation, a decline of host fishes, introduction of alien species, nutrition leakages from agriculture and pollutants of medic drugs and poison. Ann Gustavsson made in the year of 2007 a study over rejuventation of freshwater great mussels in nine watersystems and considered that the rejuventation within the populations were all along the line poor. This study orients from her work and points to determine if there is a connection between the poor juventation and pollution of nitrogen and phosphorous from industries and private sanitations. The study was performed with the software program ArcGIS9.2 to take out drainage areas for the concerned habitats and contact was made with the concerned authoritys. When it comes to supervision of private sanitations is it the countys and for industries is it the county administrative board. Most of the countys had a very difficult way to reach their data of the private sanitations and those who had data had great holes in their knowledge in them. The greatest emission of nitrogen was without doubt the industries, but a more even allocation could be seen in the pollution of phosphourus, where the industries and the private sanitations stood for about fifty- fifty of the pollution. The greatest emission of nitrogen and phosphourus happened in Viskan, in the drainage area for Lekvad,there it was a lack of mussels. The species of Anodonta anatina showed a strong positive correlation between emission of nitrogen and phosphourus with the way of juvenile mussels in the population. More studies is need to do in these areas, both when it comes to continuing mapping of rejuventation within the freshwater great mussels in several waters and template value for pollution of nitrogen and phosphourus, that is very doubtful today. Even studies concerning other factors, like predation, host fishes and the influence of poison and medic drugs is needing to do, as it is few studies concerning this today.

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  • 45.
    Laubmeier, A. N.
    et al.
    Center for Research in Scientific Computation, North Carolina State University, Raleigh, NC, USA.
    Wootton, Kate
    Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Banks, J. E.
    Undergraduate Research Opportunities Center, California State University, Monterey Bay, Seaside, CA, USA.
    Bommarco, Riccardo
    Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Curtsdotter, Alva
    Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Jonsson, Tomas
    Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Roslin, Tomas
    Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Banks, H. T.
    Center for Research in Scientific Computation, North Carolina State University, Raleigh, NC, USA.
    From theory to experimental design: Quantifying a trait-based theory of predator-prey dynamics2018In: PLoS ONE, E-ISSN 1932-6203, Vol. 13, no 4, article id e0195919Article in journal (Refereed)
    Abstract [en]

    Successfully applying theoretical models to natural communities and predicting ecosystem behavior under changing conditions is the backbone of predictive ecology. However, the experiments required to test these models are dictated by practical constraints, and models are often opportunistically validated against data for which they were never intended. Alternatively, we can inform and improve experimental design by an in-depth pre-experimental analysis of the model, generating experiments better targeted at testing the validity of a theory. Here, we describe this process for a specific experiment. Starting from food web ecological theory, we formulate a model and design an experiment to optimally test the validity of the theory, supplementing traditional design considerations with model analysis. The experiment itself will be run and described in a separate paper. The theory we test is that trophic population dynamics are dictated by species traits, and we study this in a community of terrestrial arthropods. We depart from the Allometric Trophic Network (ATN) model and hypothesize that including habitat use, in addition to body mass, is necessary to better model trophic interactions. We therefore formulate new terms which account for micro-habitat use as well as intra-and interspecific interference in the ATN model. We design an experiment and an effective sampling regime to test this model and the underlying assumptions about the traits dominating trophic interactions. We arrive at a detailed sampling protocol to maximize information content in the empirical data obtained from the experiment and, relying on theoretical analysis of the proposed model, explore potential shortcomings of our design. Consequently, since this is a "pre-experimental" exercise aimed at improving the links between hypothesis formulation, model construction, experimental design and data collection, we hasten to publish our findings before analyzing data from the actual experiment, thus setting the stage for strong inference.

  • 46.
    Lee, Marcus
    et al.
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden.
    Zhang, Huan
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden / Chinese Academy of Sciences, Institute of Hydrobiology, Wuhan, People’s Republic of China.
    Sha, Yongcui
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden.
    Hegg, Alexander
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden.
    Ekelund Ugge, Gustaf
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden.
    Vinterstare, Jerker
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden.
    Škerlep, Martin
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden.
    Pärssinen, Varpu
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden.
    Herzog, Simon David
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden.
    Björnerås, Caroline
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden.
    Gollnisch, Raphael
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden.
    Johansson, Emma
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden.
    Hu, Nan
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden.
    Nilsson, Anders P.
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden / Department of Environmental and Life Sciences, Karlstad University, Karlstad, Sweden.
    Hulthén, Kaj
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden / Department of Environmental and Life Sciences, Karlstad University, Karlstad, Sweden / Department of Biological Sciences and W.M. Keck Center for Behavioral Biology, North Carolina State University, Raleigh, NC, USA.
    Rengefors, Karin
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden.
    Langerhans, Brian R.
    Department of Biological Sciences and W.M. Keck Center for Behavioral Biology, North Carolina State University, Raleigh, NC, USA.
    Brönmark, Christer
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden.
    Hansson, Lars-Anders
    Department of Biology, Aquatic Ecology, Lund University, Lund, Sweden.
    Low-latitude zooplankton pigmentation plasticity in response to multiple threats2019In: Royal Society Open Science, E-ISSN 2054-5703, Vol. 6, no 7, article id 190321Article in journal (Refereed)
    Abstract [en]

    Crustacean copepods in high-latitude lakes frequently alter their pigmentation facultatively to defend themselves against prevailing threats, such as solar ultraviolet radiation ( UVR) and visually oriented predators. Strong seasonality in those environments promotes phenotypic plasticity. To date, no one has investigated whether low-latitude copepods, experiencing continuous stress from UVR and predation threats, exhibit similar inducible defences. We here investigated the pigmentation levels of Bahamian 'blue hole' copepods, addressing this deficit. Examining several populations varying in predation risk, we found the lowest levels of pigmentation in the population experiencing the highest predation pressure. In a laboratory experiment, we found that, in contrast with our predictions, copepods from these relatively constant environments did show some changes in pigmentation subsequent to the removal of UVR; however, exposure to water from different predation regimes induced minor and idiosyncratic pigmentation change. Our findings suggest that low-latitude zooplankton in inland environments may exhibit reduced, but non-zero, levels of phenotypic plasticity compared with their high-latitude counterparts.

  • 47.
    Leickt, Evelina
    University of Skövde, School of Life Sciences.
    Bäverhyddors påverkan på vattenlevande evertebrater2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The activity of beavers creates productive wetlands with high biodiversity. A previous study found that dam constructions of beavers contribute to a higher number of aquatic invertebrate species compared to upstream and downstream sites. In some cases beavers build their hut along the shore without damming up the water flow (Törnblom & Henrikson 2011). This report is intended to determine how the beaver hut affects the abundance of water living invertebrates.Sampling at the beaver hut, upstream and downstream, of water living invertebrates was performed. To determine differences in individual number, species number and diversity index between the sites statistical calculation was performed. The results show a difference in individual numbers between beaver huts and downstream and upstream sites and the individual number was higher at the beaver hut than the two other sites. No difference in number of species or diversity index was found. The higher temperature of the water and more nutrition is two aspects that are discussed as contributing factor to the higher number of individuals near the hut. The difference in species and species number between a beaver dam and a beaver hut build long side the shore is also discussed.

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  • 48.
    Leidenberger, Sonja
    ArtDatabanken, Swedish Species Information Centre, SLU, Uppsala, Sweden.
    Biodling på naturligt sätt – inte omöjligt2016In: Fauna och flora : populär tidskrift för biologi, ISSN 0014-8903, Vol. 111, no 3, p. 46-47Article, book review (Other (popular science, discussion, etc.))
  • 49.
    Leidenberger, Sonja
    et al.
    University of Skövde, School of Bioscience. University of Skövde, Systems Biology Research Environment.
    Boström, Sven
    Naturhistoriska riksmuseet.
    Diversitet hos hakmaskar – tarmparasiter hos gråsälar i Östersjön2019In: Fauna och flora : populär tidskrift för biologi, ISSN 0014-8903, Vol. 114, no 2, p. 35-39Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    Döda gråsälar i Östersjön har insamlats och undersökts genom obduktion på Naturhistoriska riksmuseet sedan 1970-talet. En relativt stor andel av de obducerade sälarna har haft sår i tarmarna,och troligen kan perforerade tarmsår vara en av orsakerna till att de har dött. Tarmsåren förorsakas av tre arter av hakmaskar i släktet Corynosoma, och dessa har blivit föremål för ingående morfologiska och ekologiska studier.

  • 50.
    Leidenberger, Sonja
    et al.
    University of Skövde, School of Bioscience. University of Skövde, Systems Biology Research Environment.
    Boström, Sven
    Swedish Museum of Natural History, Department of Zoology, Stockholm, Sweden.
    Wayland, Matthew Thomas
    University of Cambridge, United Kingdom.
    Host records and geographical distribution of Corynosoma magdaleni, C. semerme and C. strumosum (Acanthocephala: Polymorphidae)2020In: Biodiversity Data Journal, ISSN 1314-2836, E-ISSN 1314-2828, Vol. 8, article id e50500Article in journal (Refereed)
    Abstract [en]

    A literature survey was conducted to investigate the host and geographical distribution patterns of three Corynosoma species (Acanthocephala: Polymorphidae), viz. C. magdaleni, C. semerme and C. strumosum. All three species appear to be restricted to the Northern Hemisphere. Occurrence records of C. magdaleni are limited to the Northern Atlantic coasts, while C. semerme has a circumpolar distribution. The geographical range of Corynosoma strumosum encompasses the distributions of the other two species, but also extends into warmer southern regions. Some Corynosoma populations are living with their definitive hosts in very isolated locations, such as in the brackish Baltic Sea or different freshwater lakes (e.g. Lake Saimaa). All three species have a heteroxenous life cycle, comprising a peracaridan intermediate host, a fish paratenic host and a mammalian definitive host. Occasionally, an acanthocephalan may enter an accidental host, from which it is unable to complete its life cycle. The host records reported here are categorised by type, i.e. intermediate, paratenic, definitive or accidental. While most of the definitive hosts are shared amongst the three Corynosoma species, C. strumosum showed the broadest range of paratenic hosts, which reflects its more extensive geographical distribution. One aim of this study and extensive literature summary is to guide future sampling efforts therewith contribute to throw more light on the on-going species and morphotype discussion for this interesting parasite species.

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