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Publications (9 of 9) Show all publications
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, ISSN 2045-2322, 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)eid=2-s2.0-85070937056 (Scopus ID)
Available from: 2019-08-15 Created: 2019-08-15 Last updated: 2019-11-08Bibliographically approved
Vrasdonk, E., Palme, U., Lennartsson, T., Antonelli, A., Berg, S., Jonsson, A. & Cederberg, C. (2016). Defining the reference situation for biodiversity in Life Cycle Assessments: Review and recommendations. In: : . Paper presented at 10th International Conference on Life Cycle Assessment of Food, Dublin, 19-21 October 2016.
Open this publication in new window or tab >>Defining the reference situation for biodiversity in Life Cycle Assessments: Review and recommendations
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2016 (English)Conference paper, Published paper (Refereed)
National Category
Environmental Sciences
Research subject
Ecological Modelling Group
Identifiers
urn:nbn:se:his:diva-15101 (URN)
Conference
10th International Conference on Life Cycle Assessment of Food, Dublin, 19-21 October 2016
Funder
Swedish Research Council Formas
Available from: 2018-04-27 Created: 2018-04-27 Last updated: 2018-08-14Bibliographically approved
Berg, S., Pimenov, A., Palmer, C., Emmerson, M. & Jonsson, T. (2015). Ecological communities are vulnerable to realistic extinction sequences. Oikos, 124(4), 486-496
Open this publication in new window or tab >>Ecological communities are vulnerable to realistic extinction sequences
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2015 (English)In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 124, no 4, p. 486-496Article in journal (Refereed) Published
Place, publisher, year, edition, pages
John Wiley & Sons, 2015
National Category
Ecology
Research subject
Natural sciences; Ecological Modelling Group
Identifiers
urn:nbn:se:his:diva-10625 (URN)10.1111/oik.01279 (DOI)000352240500012 ()2-s2.0-84925853833 (Scopus ID)
Available from: 2015-01-30 Created: 2015-01-30 Last updated: 2017-12-21Bibliographically approved
Jonsson, T., Berg, S., Emmerson, M. & Pimenov, A. (2015). The context dependency of species keystone status during food web disassembly. Food Webs, 5, 1-10
Open this publication in new window or tab >>The context dependency of species keystone status during food web disassembly
2015 (English)In: Food Webs, ISSN 2352-2496, Vol. 5, p. 1-10Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
Community robustness, Extinction cascades, Secondary extinctions, Species importance, Species loss, Species traits
National Category
Ecology
Research subject
Natural sciences; Ecological Modelling Group
Identifiers
urn:nbn:se:his:diva-11995 (URN)10.1016/j.fooweb.2015.07.002 (DOI)2-s2.0-84941955313 (Scopus ID)
Available from: 2016-02-29 Created: 2016-02-29 Last updated: 2019-01-30Bibliographically approved
Jonsson, T., Berg, S., Pimenov, A., Palmer, C. & Emmerson, M. (2015). The reliability of R50 as a measure of vulnerability of food webs to sequential species deletions. Oikos, 124(4), 446-457
Open this publication in new window or tab >>The reliability of R50 as a measure of vulnerability of food webs to sequential species deletions
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2015 (English)In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 124, no 4, p. 446-457Article in journal (Refereed) Published
Place, publisher, year, edition, pages
John Wiley & Sons, 2015
National Category
Ecology
Research subject
Natural sciences; Ecological Modelling Group
Identifiers
urn:nbn:se:his:diva-10627 (URN)10.1111/oik.01588 (DOI)000352240500008 ()2-s2.0-84925861221 (Scopus ID)
Available from: 2015-01-30 Created: 2015-01-30 Last updated: 2017-12-21Bibliographically approved
Jacob, U., Jonsson, T., Berg, S., Brey, T., Eklöf, A., Mintenbeck, K., . . . Petchey, O. (2015). Valuing biodiversity and ecosystem services in a complex marine ecosystem. In: Andrea Belgrano, Guy Woodward & Ute Jacob (Ed.), Aquatic Functional Biodiversity: An Ecological and Evolutionary Perspective (pp. 189-207). London: Academic Press
Open this publication in new window or tab >>Valuing biodiversity and ecosystem services in a complex marine ecosystem
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2015 (English)In: 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)
Place, publisher, year, edition, pages
London: Academic Press, 2015
National Category
Ecology
Research subject
Natural sciences
Identifiers
urn:nbn:se:his:diva-11996 (URN)10.1016/B978-0-12-417015-5.00008-6 (DOI)2-s2.0-84940780832 (Scopus ID)978-0-12-417015-5 (ISBN)978-0-12-417020-9 (ISBN)
Available from: 2016-02-29 Created: 2016-02-29 Last updated: 2017-12-21Bibliographically approved
Kaneryd, L., Borrvall, C., Berg, S., Curtsdotter, A., Eklöf, A., Hauzy, C., . . . Ebenman, B. (2012). Species-rich ecosystems are vulnerable to cascading extinctions in an increasingly variable world. Ecology and Evolution, 2(4), 858-874
Open this publication in new window or tab >>Species-rich ecosystems are vulnerable to cascading extinctions in an increasingly variable world
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2012 (English)In: Ecology and Evolution, ISSN 2045-7758, E-ISSN 2045-7758, Vol. 2, no 4, p. 858-874Article in journal (Refereed) Published
Abstract [en]

Global warming leads to increased intensity and frequency of weather extremes. Such increased environmental variability might in turn result in increased variation in the demographic rates of interacting species with potentially important consequences for the dynamics of food webs. Using a theoretical approach, we here explore the response of food webs to a highly variable environment.We investigate how species richness and correlation in the responses of species to environmental fluctuations affect the risk of extinction cascades. We find that the risk of extinction cascades increases with increasing species richness, especially when correlation among species is low. Initial extinctions of primary producer species unleash bottom-up extinction cascades, especially in webs with specialist consumers. In this sense, species-rich ecosystems are less robust to increasing levels of environmental variability than species-poor ones. Our study thus suggests that highly speciesrich ecosystems such as coral reefs and tropical rainforests might be particularly vulnerable to increased climate variability.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2012
Keywords
Biodiversity, climate change, ecological networks, environmental variability, extinction cascades, food web, species interactions, stability, stochastic models, weather extremes
National Category
Natural Sciences
Research subject
Natural sciences
Identifiers
urn:nbn:se:his:diva-5920 (URN)10.1002/ece3.218 (DOI)000312444000015 ()22837831 (PubMedID)2-s2.0-84888028315 (Scopus ID)
Available from: 2012-06-04 Created: 2012-06-04 Last updated: 2017-12-21Bibliographically approved
Jacob, U., Thierry, A., Brose, U., Arntz, W. E., Berg, S., Brey, T., . . . Dunne, J. A. (2011). The Role of Body Size in Complex Food Webs: A Cold Case. Advances in Ecological Research, 45, 181-223
Open this publication in new window or tab >>The Role of Body Size in Complex Food Webs: A Cold Case
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2011 (English)In: Advances in Ecological Research, ISSN 0065-2504, E-ISSN 2163-582X, Vol. 45, p. 181-223Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Elsevier, 2011
Keywords
Network structure, Ecosystem, Food web, Weddell Sea
National Category
Ecology
Research subject
Natural sciences; Ecological Modelling Group
Identifiers
urn:nbn:se:his:diva-5812 (URN)10.1016/B978-0-12-386475-8.00005-8 (DOI)000303215900005 ()2-s2.0-80053185893 (Scopus ID)
Available from: 2012-04-30 Created: 2012-04-30 Last updated: 2017-12-21Bibliographically approved
Berg, S., Christianou, M., Jonsson, T. & Ebenman, B. (2011). Using sensitivity analysis to identify keystone species and keystone links in size-based food webs. Oikos, 120(4), 510-519
Open this publication in new window or tab >>Using sensitivity analysis to identify keystone species and keystone links in size-based food webs
2011 (English)In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 120, no 4, p. 510-519Article in journal (Refereed) Published
Abstract [en]

Human-induced alterations in the birth and mortality rates of species and in the strength of interactions within and between species can lead to changes in the structure and resilience of ecological communities. Recent research points to the importance of considering the distribution of body sizes of species when exploring the response of communities to such perturbations. Here, we present a new size-based approach for assessing the sensitivity and elasticity of community structure (species equilibrium abundances) and resilience (rate of return to equilibrium) to changes in the intrinsic growth rate of species and in the strengths of species interactions. We apply this approach on two natural systems, the pelagic communities of the Baltic Sea and Lake Vättern, to illustrate how it can be used to identify potential keystone species and keystone links. We find that the keystone status of a species is closely linked to its body size. The analysis also suggests that communities are structurally and dynamically more sensitive to changes in the effects of prey on their consumers than in the effects of consumers on their prey. Moreover, we discuss how community sensitivity analysis can be used to study and compare the fragility of communities with different body size distributions by measuring the mean sensitivity or elasticity over all species or all interaction links in a community. We believe that the community sensitivity analysis developed here holds some promise for identifying species and links that are critical for the structural and dynamic robustness of ecological communities.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2011
National Category
Natural Sciences
Research subject
Natural sciences
Identifiers
urn:nbn:se:his:diva-5180 (URN)10.1111/j.1600-0706.2010.18864.x (DOI)000288753800005 ()2-s2.0-79952995307 (Scopus ID)
Available from: 2011-07-01 Created: 2011-07-01 Last updated: 2017-12-21Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-6122-6167

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