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Mauritsson, K. & Jonsson, T. (2023). A new flexible model for maintenance and feeding expenses that improves description of individual growth in insects. Scientific Reports, 13(1), Article ID 16751.
Open this publication in new window or tab >>A new flexible model for maintenance and feeding expenses that improves description of individual growth in insects
2023 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 13, no 1, article id 16751Article in journal (Refereed) Published
Abstract [en]

Metabolic theories in ecology interpret ecological patterns at different levels through the lens of metabolism, typically applying allometric scaling to describe energy use. This requires a sound theory for individual metabolism. Common mechanistic growth models, such as ‘von Bertalanffy’, ‘dynamic energy budgets’ and the ‘ontogenetic growth model’ lack some potentially important aspects, especially regarding regulation of somatic maintenance. We develop a model for ontogenetic growth of animals, applicable to ad libitum and food limited conditions, based on an energy balance that expresses growth as the net result of assimilation and metabolic costs for maintenance, feeding and food processing. The most important contribution is the division of maintenance into a ‘non-negotiable’ and a ‘negotiable’ part, potentially resulting in hyperallometric scaling of maintenance and downregulated maintenance under food restriction. The model can also account for effects of body composition and type of growth at the cellular level. Common mechanistic growth models often fail to fully capture growth of insects. However, our model was able to capture empirical growth patterns observed in house crickets.

Place, publisher, year, edition, pages
Springer Nature, 2023
National Category
Ecology Zoology
Research subject
Ecological Modelling Group
Identifiers
urn:nbn:se:his:diva-23327 (URN)10.1038/s41598-023-43743-1 (DOI)001085340000017 ()37798309 (PubMedID)2-s2.0-85173773729 (Scopus ID)
Funder
Swedish Research Council, 2018-05523University of Skövde
Note

CC BY 4.0

Ecological Modelling Group, School of Bioscience, University of Skövde, Skövde, Sweden. email: karl.mauritsson@his.se

Funding was provided by the Swedish research council, Grant number 2018-05523.

Open access funding provided by University of Skövde.

Author correction in: Scientific Reports, Volume 13, 18808 (2023). https://doi.org/10.1038/s41598-023-45923-5

Available from: 2023-10-24 Created: 2023-10-24 Last updated: 2023-12-28Bibliographically approved
Wootton, K. L., Curtsdotter, A., Bommarco, R., Roslin, T. & Jonsson, T. (2023). Food webs coupled in space: Consumer foraging movement affects both stocks and fluxes. Ecology, 104(8), Article ID e4101.
Open this publication in new window or tab >>Food webs coupled in space: Consumer foraging movement affects both stocks and fluxes
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2023 (English)In: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 104, no 8, article id e4101Article in journal (Refereed) Published
Abstract [en]

The exchange of material and individuals between neighboring food webs is ubiquitous and affects ecosystem functioning. Here, we explore animal foraging movement between adjacent, heterogeneous habitats and its effect on a suite of interconnected ecosystem functions. Combining dynamic food web models with nutrient-recycling models, we study foraging across habitats that differ in fertility and plant diversity. We found that net foraging movement flowed from high to low fertility or high to low diversity and boosted stocks and flows across the whole loop of ecosystem functions, including biomass, detritus, and nutrients, in the recipient habitat. Contrary to common assumptions, however, the largest flows were often between the highest and intermediate fertility habitats rather than highest and lowest. The effect of consumer influx on ecosystem functions was similar to the effect of increasing fertility. Unlike fertility, however, consumer influx caused a shift toward highly predator-dominated biomass distributions, especially in habitats that were unable to support predators in the absence of consumer foraging. This shift resulted from both direct and indirect effects propagated through the interconnected ecosystem functions. Only by considering both stocks and fluxes across the whole loop of ecosystem functions do we uncover the mechanisms driving our results. In conclusion, the outcome of animal foraging movements will differ from that of dispersal and diffusion. Together we show how considering active types of animal movement and the interconnectedness of ecosystem functions can aid our understanding of the patchy landscapes of the Anthropocene.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023
National Category
Ecology
Research subject
Ecological Modelling Group
Identifiers
urn:nbn:se:his:diva-23049 (URN)10.1002/ecy.4101 (DOI)001021620600001 ()37203417 (PubMedID)2-s2.0-85163791488 (Scopus ID)
Funder
Swedish Research Council, 2016‐06872Swedish Research Council, 2018‐05523EU, Horizon 2020, 856506EU, European Research Council, 856506
Note

CC BY-NC 4.0

Correspondence: Kate L. Wootton Email: kate.l.wootton@gmail.com Present address Kate L. Wootton, School of Biological Sciences, University of Canterbury, Christchurch, New Zealand.

We thank Kevin McCann, David Gilljam, and YuvalZelnick for helpful comments on an earlier version of this manuscript. Kate L. Wootton, Tomas Roslin, and Tomas Jonsson were funded by Vetenskapsrådet (VR) Grant 2016-06872, and Tomas Jonsson was also partially fundedby VR Grant 2018-05523. Tomas Roslin was funded by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement 856506; ERC-synergy project LIFEPLAN). Open access publishing facilitated by University of Canterbury, as part of the Wiley - University of Canterbury agreement via the Council of Australian University Librarians.

Available from: 2023-07-20 Created: 2023-07-20 Last updated: 2023-12-19Bibliographically approved
Wootton, K. L., Curtsdotter, A., Roslin, T., Bommarco, R. & Jonsson, T. (2023). Towards a modular theory of trophic interactions. Functional Ecology, 37(1), 26-43
Open this publication in new window or tab >>Towards a modular theory of trophic interactions
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2023 (English)In: Functional Ecology, ISSN 0269-8463, E-ISSN 1365-2435, Vol. 37, no 1, p. 26-43Article in journal (Refereed) Published
Abstract [en]

Species traits and environmental conditions determine the occurrence and strength of trophic interactions. If we understand the relationship between these factors and trophic interactions, we can make more accurate predictions and build better trophic-interaction models. We can compare traits and conditions by considering their effect on different parts (steps) of a trophic interaction, such as the steps search and pursuit. By linking traits to relevant steps, we can use these relationships to build trophic-interaction models. Currently, this is done ad hoc, defining steps based on the species and traits of interest. This makes it difficult to compare across traits and species and gain an overarching understanding of how traits and the environment drive trophic interactions. We present a comprehensive approach for the explicit choice of interaction steps and species traits or environmental conditions, which is readily integrated into existing models. The core of this framework is that it is modular; we present eight steps that occur in all trophic interactions and use them to build a modular, general dynamic model. When applying the framework, one explicitly selects only the most relevant steps and uses those to build a specific model. To build our modular framework, we revisit and expand the functional and numerical response functions, dividing the trophic interaction into eight steps: (1) search, (2) prey detection, (3) attack decision, (4) pursuit, (5) subjugation, (6) ingestion, (7) digestion and (8) nutrient allocation. Together these steps form a general dynamical model where trophic interactions can be explicitly parameterized for multiple traits and environmental factors. We then concretize this approach by outlining how a specific community can be modelled by selecting key modules (steps) and parameterizing them for relevant factors. This we exemplify for a community of terrestrial arthropods using empirical data on body size and temperature responses. With species interactions at the core of community dynamics, our modular approach allows for quantification and comparisons of the importance of different steps, traits, and abiotic factors across ecosystems and trophic-interaction types, and provides a powerful tool for trait-based prediction of food-web structure and dynamics. A free Plain Language Summary can be found within the Supporting Information of this article. 

Place, publisher, year, edition, pages
John Wiley & Sons, 2023
Keywords
body size, ecological interaction networks, food webs, functional response, numerical response, predator–prey interactions, trait-based approaches
National Category
Ecology
Research subject
Ecological Modelling Group
Identifiers
urn:nbn:se:his:diva-20718 (URN)10.1111/1365-2435.13954 (DOI)000717846600001 ()2-s2.0-85119146521 (Scopus ID)
Funder
Swedish Research Council, 2016-04580
Note

© 2021 British Ecological Society

First published: 22 October 2021

Correspondence: Kate L. Wootton

Financial support from the Swedish Research Council (VR, Dnr 2016-04580)

Available from: 2021-11-25 Created: 2021-11-25 Last updated: 2023-01-31Bibliographically approved
Wootton, K. L., Curtsdotter, A., Jonsson, T., Banks, H. T., Bommarco, R., Roslin, T. & Laubmeier, A. N. (2022). Beyond body size-new traits for new heights in trait-based modelling of predator-prey dynamics. PLOS ONE, 17(7 July), Article ID e0251896.
Open this publication in new window or tab >>Beyond body size-new traits for new heights in trait-based modelling of predator-prey dynamics
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2022 (English)In: PLOS ONE, E-ISSN 1932-6203, Vol. 17, no 7 July, article id e0251896Article in journal (Refereed) Published
Abstract [en]

Food webs map feeding interactions among species, providing a valuable tool for understanding and predicting community dynamics. Using species' body sizes is a promising avenue for parameterizing food-web models, but such approaches have not yet been able to fully recover observed community dynamics. Such discrepancies suggest that traits other than body size also play important roles. For example, differences in species' use of microhabitat or non-consumptive effects of intraguild predators may affect dynamics in ways not captured by body size. In Laubmeier et al. (2018), we developed a dynamic food-web model incorporating microhabitat and non-consumptive predator effects in addition to body size, and used simulations to suggest an optimal sampling design of a mesocosm experiment to test the model. Here, we perform the mesocosm experiment to generate empirical timeseries of insect herbivore and predator abundance dynamics. We minimize least squares error between the model and time-series to determine parameter values of four alternative models, which differ in terms of including vs excluding microhabitat use and non-consumptive predator-predator effects. We use both statistical and expert-knowledge criteria to compare the models and find including both microhabitat use and non-consumptive predatorpredator effects best explains observed aphid and predator population dynamics, followed by the model including microhabitat alone. This ranking suggests that microhabitat plays a larger role in driving population dynamics than non-consumptive predator-predator effects, although both are clearly important. Our results illustrate the importance of additional traits alongside body size in driving trophic interactions. They also point to the need to consider trophic interactions and population dynamics in a wider community context, where non-trophic impacts can dramatically modify the interplay between multiple predators and prey. Overall, we demonstrate the potential for utilizing traits beyond body size to improve traitbased models and the value of iterative cycling between theory, data and experiment to hone current insights into how traits affect food-web dynamics. © 2022 Wootton et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Place, publisher, year, edition, pages
Public Library of Science, 2022
Keywords
aphid, article, body size, food web, herbivore, least square analysis, mesocosm, microhabitat, nonhuman, population dynamics, predator, simulation, theoretical study, time series analysis, animal, food chain, herbivory, insect, predation, Animals, Insecta, Predatory Behavior
National Category
Ecology Environmental Sciences Other Biological Topics
Research subject
Ecological Modelling Group
Identifiers
urn:nbn:se:his:diva-21668 (URN)10.1371/journal.pone.0251896 (DOI)000911392100001 ()35862348 (PubMedID)2-s2.0-85134750752 (Scopus ID)
Note

CC BY 4.0

Correspondence Address: Wootton, K.L.; Swedish University of Agricultural Sciences, Sweden; email: kate.l.wootton@gmail.com

Data Availability Statement: All data are available from the Swedish national  data service https://snd.gu.se/en. Title: Population dynamics in greenhouse experiments of aphids and their predators, based on body size and habitat use.

Funding: This research was supported by the Swedish University of Agricultural Sciences, Faculty of Natural Resources and Agricultural Sciences (KLW, RB, TR) and the Swedish University of Agricultural Sciences, August T. Larsson guest researchers programme (awarded to RB) URL:https://www.slu.se/en/faculties/nj/

Available from: 2022-08-08 Created: 2022-08-08 Last updated: 2023-03-02Bibliographically approved
Berg, S., Jonsson, A., Jonsson, T. & Quttineh, N.-H. (2022). Ekologisk funktionalitet av värdekärnor för barrskogar inom Västra Götalands län: Ett strategiskt underlag för planering av förändrad skogsskötsel av barrskogsområden inom Västra Götalands län i syfte att stärka skogarnas förutsättningar att stödja biologisk mångfald och skogens klimatnytta.
Open this publication in new window or tab >>Ekologisk funktionalitet av värdekärnor för barrskogar inom Västra Götalands län: Ett strategiskt underlag för planering av förändrad skogsskötsel av barrskogsområden inom Västra Götalands län i syfte att stärka skogarnas förutsättningar att stödja biologisk mångfald och skogens klimatnytta
2022 (Swedish)Report (Other (popular science, discussion, etc.))
Abstract [sv]

Skogsstyrelsen redovisar i sin utvärdering av miljömålet Levande skogar 2019 att centrala hinder för uppfyllelse av miljömålet är minskande och fragmenterade livsmiljöer och minskande och/eller små populationer av ett antal hotade arter knutna till skogsekosystemet. En väg framåt för att vända denna trend är att framtidens skogsbruk bland annat bör utvecklas utifrån ett landskapsperspektiv och där hyggesfria skogsbruksmetoder ökar i omfattning.

Länsstyrelserna i Sverige har genom sitt arbete med regionala handlingsplaner för grön infrastruktur identifierat så kallade värdekärnor – områden av stor betydelse för skogsarternas överlevnad. I denna studie har Västra Götalands läns värdekärnor analyserats med avseende på deras förmåga att stödja biologisk mångfald i ett landskapsperspektiv. Arbetet har gjorts i samverkan med Länsstyrelsen för Västra götalands län.

Metoden som använts är Biotope Biodiversity Capacity Indicator (BBCI). Metoden har utvecklats inom forskningsprojektet “Landscape biodiversity capacity: a tool for measuring, monitoring and managing” finansierat av Naturvårdsverkets miljöforskningsanslag (2019-2022).

Resultaten visar vilka geografiskt avgränsade värdekärnor som idag har hög ekologisk funktionalitet och som utgör biologiska överlevnads- och spridningshotspots för arter knutna till barrskogar. Vidare visar resultaten att endast sju kommuner har BBCI-värden över 1, det vill säga, ett hållbart skogslandskap som kan hålla fokusarten i ett 100-årsperspektiv.

För att nå de svenska miljömålen Levande skogar och Ett rikt växt- och djurliv samt skapa bättre förutsättningar för skogens biologiska mångfald att fortleva behöver nuvarande skogsmetoder med trakthyggesbruk anpassas till brukningsformer som tar större hänsyn till skogens ekosystem. Resultaten från denna studie kan ge prioriteringsunderlag för inom vilka produktionsskogar en så kallad återvildning genom förändrad brukningsmetod skulle kunna resultera i betydelsefull ökad ekologisk funktionalitet på landskapsnivå för de västgötska barrskogarna.     

Publisher
p. 49
Keywords
barrskog, grön infrastruktur, värdekärnor, biologisk mångfald, markanvändning, skogsskötsel
National Category
Ecology
Research subject
Ecological Modelling Group
Identifiers
urn:nbn:se:his:diva-21129 (URN)
Note

[Rapporten är gjord] i samverkan med Länsstyrelsen i Västra götalands län. 

Available from: 2022-05-11 Created: 2022-05-11 Last updated: 2022-05-12Bibliographically approved
Jonsson, A., Berg, S., Quttineh, N.-H., Leidenberger, S. & Jonsson, T. (2022). Landskapets förmåga att hålla biologisk mångfald: – en indikator för biologisk mångfald och ett planeringsverktyg för prioritering av markanvändning. Naturvårdsverket
Open this publication in new window or tab >>Landskapets förmåga att hålla biologisk mångfald: – en indikator för biologisk mångfald och ett planeringsverktyg för prioritering av markanvändning
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2022 (Swedish)Report (Other academic)
Abstract [sv]

Rapporten beskriver ett nytt verktyg framtaget för att underlätta planering av grön infrastruktur på landskapsnivå och ger via fallstudier exempel på hur verktyget kan användas. Projektet har utförts i ett samarbete med expertis inom teoretisk ekologi, ekologi, biodiversitetsinformatik och tillämpad matematik.

Forskningsprojektet har utvecklat en modell för att uppskatta ett landskaps för-måga att hålla biologisk mångfald i dess olika biotoper (Biotope Biodiversity Capacity Indicator, BBCI). Ett teoretiskt ramverk baserat på ekologisk kunskap har tagits fram som grund för modellen.

Syftet med BBCI är att modellen ska kunna användas som ett planeringsverktyg för att:

  • stärka biologisk mångfald i ett landskap,
  • förbättra förutsättningarna för arter att använda hela landskapet och
  • skapa bättre förutsättningar för hänsyn till biologisk mångfald i samband med samhällsutveckling.

För att testa och beskriva verktygets användbarhet har fyra fallstudier genomförts med olika fokus:

  1. Analys av fragmenteringen i ett barrskogslandskap som sköts med särskild naturhänsyn i Västernorrlands län.
  2. Analys av barrskogsvärdekärnors kapacitet för biologisk mångfald inom Västra Götalands län som synliggör vikten av kommunöverskridande samverkan.
  3. Analys av potentiella målkonflikter mellan två biotoper, ädellövskog och öppen mark med skyddsvärda träd i Valle.
  4. Analys av kapacitet för biologisk mångfald hos äldre ädellövträd i ett landskap mixat med urbana miljöer och landsbygd, Mjölby kommun.

Parallellt med utvcklingen av BBCI har en tät dialog och samverkan skett med olika intressenter och slutanvändare. Den breda dialogen har medfört ett effektivt kun-skapsutbyte mellan olika parter.

Rapporten avslutas med att beskriva utmaningar och verktygets utvecklings-potential både avseende pedagogik och teknik men även hur modellen kan byggas på och utvecklas med ytterligare funktioner för en breddad tillämpning.

Abstract [en]

The report describes a new tool, developed to facilitate the planning of green infrastruc-ture at the landscape level, and provides via case studies examples of how the tool can be used. The project has been a collaboration with expertise in theoretical ecology, ecology, biodiversity informatics and applied mathematics.

The research project has developed a model for estimating a landscape’s ability to maintain biodiversity in its various biotopes (Biotope Biodiversity Capacity Indicator, BBCI). A theoretical framework based on ecological knowledge has been developed as a basis for the model.

The purpose of the BBCI is to be a planning tool to:

  • strengthen landscape biodiversity,
  • improve the conditions for species to use the entire landscape and
  • create better conditions for consideration of biological diversity in connection with societal development.

To test and describe the usefulness of the tools, four case studies with different focuses have been conducted:

  1. Analysis of the fragmentation in a coniferous forest landscape that is managed with special consideration for nature in Västernorrland County.
  2. Analysis of valuable coniferous forest cores and their capacity for biological diversity within Västra Götaland County, with highlights on the importance of cross-municipal collaboration.
  3. Analysis of potential target conflicts between two biotopes, deciduous forest and open land with trees worthy of protection in Valle.
  4. Analysis of capacity for biodiversity in older deciduous trees in a mixed urban and countryside landscape, Mjölby municipality.

Parallel to the development of BBCI, a close dialogue and collaboration has taken place with stakeholders and end users. The broad dialogue has resulted in an effective exchange of knowledge.

The report concludes by describing challenges and development potential of the tool, both in terms of pedagogy and technology as well as how the model can further developed with additional functions.

Place, publisher, year, edition, pages
Naturvårdsverket, 2022. p. 42
Series
Rapport / Naturvårdsverket, ISSN 0282-7298 ; 7062
National Category
Ecology
Research subject
Ecological Modelling Group
Identifiers
urn:nbn:se:his:diva-22001 (URN)978-91-620-7062-5 (ISBN)
Funder
Swedish Environmental Protection Agency
Available from: 2022-11-02 Created: 2022-11-02 Last updated: 2022-11-03Bibliographically approved
Roos, H., Berg, S., Jonsson, A., Jonsson, T. & Thordarson, M. (2021). Identification of patches with high ecological importance of broadleaved forests and open lands with valuable trees in Valle: Using a biodiversity capacity landscape metric, combining area and connectivity, to examining management options. Länsstyrelsen Västra Götaland
Open this publication in new window or tab >>Identification of patches with high ecological importance of broadleaved forests and open lands with valuable trees in Valle: Using a biodiversity capacity landscape metric, combining area and connectivity, to examining management options
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2021 (English)Report (Other academic)
Abstract [en]

This study is a complement to previous studies of regional action plans of green infrastructure in Valle (County Administrative Board 2016; County Administrative Board 2019). The aim was to identify the relative importance of biotope patches of broadleaved forest and open lands with valuable trees, respectively, in Valle for the maintenance and enhancement of biodiversity. A testversion of the method Biotope Biodiversity Capacity Indicator (BBCI) was applied on the two biotopes of broadleaved forest and open lands with valuable trees in Valle. BBCI was developed within the project “Landscape biodiversity capacity: a tool for measuring, monitoring and managing” financed by the Swedish Environmental Protection Agency, Miljövårdsanslaget (2019-2021).The results of the BBCI-analysis identified hotspots areas for the two studied biotopes in Valle, that is, areas with important patches for the sustainability of BBCI. For broadleaved forest, the northern part of Valle stands out as highly importantand for open lands with valuable trees the south-southwest parts of Valle stands out as the most important area. In this study, effects on BBCI from restauration of broadleaved forests to open land with valuable trees was evaluated. Calculations of BBCI shows encouraging results of an increased capacity for biodiversity of the biotope with open lands with valuable trees but not a significant decrease in biodiversity capacity of broadleaved forest, despite the area losses and fragmentation caused from the restauration. Both biotopes have BBCI values above one, showing that they are sustainable within a 100 year period. The result can be used as support to management plans of nature reserves in a landscape setting and as recommendations or advice to private land owners. Moreover, the study was produced within the work of BIOGOV, where regional action plans for nature, tourisms, culture and small enterprises were under development.

Place, publisher, year, edition, pages
Länsstyrelsen Västra Götaland, 2021. p. 36
Series
Rapport / Länsstyrelsen Västra Götaland, ISSN 1403-168X ; 2021:14
National Category
Ecology
Research subject
Ecological Modelling Group
Identifiers
urn:nbn:se:his:diva-20518 (URN)
Funder
Swedish Environmental Protection Agency
Note

Löpnummer: 2021:14

Diarienummer: 511-54932-2020

Kontakt: Henrik Roos

Available from: 2021-09-01 Created: 2021-09-01 Last updated: 2021-09-01Bibliographically approved
Sandström, A., Norrgård, J., Axenrot, T., Setzer, M. & Jonsson, T. (2020). Getting Choosy About Whitefish in Lake Vättern: Using Participatory Approaches to Improve Fisheries Selectivity. In: Peter Holm, Maria Hadjimichael, Sebastian Linke, Steven Mackinson (Ed.), Collaborative Research in Fisheries: (pp. 43-59). Cham: Springer
Open this publication in new window or tab >>Getting Choosy About Whitefish in Lake Vättern: Using Participatory Approaches to Improve Fisheries Selectivity
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2020 (English)In: Collaborative Research in Fisheries / [ed] Peter Holm, Maria Hadjimichael, Sebastian Linke, Steven Mackinson, Cham: Springer, 2020, p. 43-59Chapter in book (Refereed)
Abstract [en]

Our case study was channeled through a comanagement group and initiated by fishermen. The aim was to develop the selectivity of the fisheries in Lake Vättern through a collaboration of fishermen, regional managers, and scientists. The case study was planned collectively within the fisheries co-management group and through workshops with participating fishermen. Fishermen were given special permits to test various strategies adapted to their own experiences and the properties of their local fishing grounds. First, the population structure of the focal species, whitefish, was investigated in a joint study utilizing fishermen’s experiential knowledge and genetic analyses of whitefish. The results showed that the population is divided into at least two unique stocks that ideally should be managed separately. Second, the results from studies on by-catch in different areas, seasons, and gears indicated a substantial potential to increase the selectivity in this fishery, particularly by targeting whitefish aggregations adjacent to spawning areas. Our study highlights the potential of the participatory approach when facilitating solutions to problems related to small-scale fisheries management. Nevertheless, we also identify some factors that might jeopardize the long-term success and dissemination of results from this case study. The recent discovery of high levels of dioxins and dioxin-like PCBs in muscle tissue of whitefish might make it harder for fishermen to sell their catch. Moreover, since the comanagement group only has an advisory function, the Swedish national authority needs to take the initiative and first implement the suggested changes in management.

Place, publisher, year, edition, pages
Cham: Springer, 2020
Series
MARE Publication Series, ISSN 2212-6260, E-ISSN 2212-6279 ; 22
Keywords
Participatory research, Comanagement, Selectivity, Lake fisheries, Whitefish
National Category
Environmental Sciences Ecology
Research subject
Ecological Modelling Group
Identifiers
urn:nbn:se:his:diva-18317 (URN)10.1007/978-3-030-26784-1_4 (DOI)978-3-030-26783-4 (ISBN)978-3-030-26784-1 (ISBN)
Available from: 2020-03-17 Created: 2020-03-17 Last updated: 2020-04-22Bibliographically approved
Säterberg, T., Jonsson, T., Yearsley, J., Berg, S. & Ebenman, B. (2019). A potential role for rare species in ecosystem dynamics. Scientific Reports, 9, 1-12, Article ID 11107.
Open this publication in new window or tab >>A potential role for rare species in ecosystem dynamics
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2019 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 9, p. 1-12, article id 11107Article in journal (Refereed) Published
Abstract [en]

The ecological importance of common species for many ecosystem processes and functions is unquestionably due to their high a bundance.Yet, the importance of rare species is much less understood. Here we take a theoretical approach, exposing dynamical models of ecological networks to small perturbations, to explore the dynamical importance of rare and common species. We find that both species types contribute to the recovery of communities following generic perturbations (i.e. perturbations affecting all species).Yet, when perturbations are selective (i.e. affects only one species), perturbations to rare species have the most pronounced effect on community stability. We show that this is due to the strong indirect effects induced by perturbations to rare species. Because indirect effects typically set in at longer timescales, our results indicate that the importance of rare species may be easily overlooked and thus underrated. Hence, our study provides a potential ecological motive for the management and protection of rare species.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019
Keywords
ecological interactions, interaction strengths, food, diversity, perturbations, extinctions, complexity, stability
National Category
Ecology
Research subject
Ecological Modelling Group
Identifiers
urn:nbn:se:his:diva-17533 (URN)10.1038/s41598-019-47541-6 (DOI)000477950800030 ()31366907 (PubMedID)2-s2.0-85070937056 (Scopus ID)
Available from: 2019-08-15 Created: 2019-08-15 Last updated: 2022-09-15Bibliographically approved
Curtsdotter, A., Banks, H. T., Banks, J. E., Jonsson, M., Jonsson, T., Laubmeier, A. N., . . . Bommarco, R. (2019). Ecosystem function in predator-prey food webs: confronting dynamic models with empirical data. Journal of Animal Ecology, 88(2), 196-210
Open this publication in new window or tab >>Ecosystem function in predator-prey food webs: confronting dynamic models with empirical data
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2019 (English)In: Journal of Animal Ecology, ISSN 0021-8790, E-ISSN 1365-2656, Vol. 88, no 2, p. 196-210Article in journal (Refereed) Published
Abstract [en]

Most ecosystem functions and related services involve species interactions across trophic levels, for example, pollination and biological pest control. Despite this, our understanding of ecosystem function in multitrophic communities is poor, and research has been limited to either manipulation in small communities or statistical descriptions in larger ones. Recent advances in food web ecology may allow us to overcome the trade-off between mechanistic insight and ecological realism. Molecular tools now simplify the detection of feeding interactions, and trait-based approaches allow the application of dynamic food web models to real ecosystems. We performed the first test of an allometric food web model's ability to replicate temporally nonaggregated abundance data from the field and to provide mechanistic insight into the function of predation. We aimed to reproduce and explore the drivers of the population dynamics of the aphid herbivore Rhopalosiphum padi observed in ten Swedish barley fields. We used a dynamic food web model, taking observed interactions and abundances of predators and alternative prey as input data, allowing us to examine the role of predation in aphid population control. The inverse problem methods were used for simultaneous model fit optimization and model parameterization. The model captured >70% of the variation in aphid abundance in five of ten fields, supporting the model-embodied hypothesis that body size can be an important determinant of predation in the arthropod community. We further demonstrate how in-depth model analysis can disentangle the likely drivers of function, such as the community's abundance and trait composition. Analysing the variability in model performance revealed knowledge gaps, such as the source of episodic aphid mortality, and general method development needs that, if addressed, would further increase model success and enable stronger inference about ecosystem function. The results demonstrate that confronting dynamic food web models with abundance data from the field is a viable approach to evaluate ecological theory and to aid our understanding of function in real ecosystems. However, to realize the full potential of food web models, in ecosystem function research and beyond, trait-based parameterization must be refined and extended to include more traits than body size. © 2018 The Authors. Journal of Animal Ecology © 2018 British Ecological Society

Place, publisher, year, edition, pages
John Wiley & Sons, 2019
Keywords
agricultural pests, allometry, body mass, conservation biological control, herbivore suppression, multitrophic functioning, predator–prey interactions, species traits
National Category
Bioinformatics and Systems Biology
Research subject
Ecological Modelling Group
Identifiers
urn:nbn:se:his:diva-16247 (URN)10.1111/1365-2656.12892 (DOI)000458963200002 ()30079547 (PubMedID)2-s2.0-85052925738 (Scopus ID)
Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2022-01-21Bibliographically approved
Projects
ACME: AdvanCing the Metabolic theory of Ecology [2018-05523_VR]; University of Skövde
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-5234-9576

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