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  • 1.
    Binzer, Amrei
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Biology. Linköping University, Faculty of Science & Engineering. University of Gottingen, Germany.
    Guill, Christian
    University of Gottingen, Germany; University of Potsdam, Germany; University of Amsterdam, Netherlands.
    Rall, Bjoern C.
    University of Gottingen, Germany; German Centre Integrat Biodivers Research iDiv, Germany; University of Jena, Germany.
    Brose, Ulrich
    University of Gottingen, Germany; German Centre Integrat Biodivers Research iDiv, Germany; University of Jena, Germany.
    Interactive effects of warming, eutrophication and size structure: impacts on biodiversity and food-web structure2016In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 22, no 1, p. 220-227Article in journal (Refereed)
    Abstract [en]

    Warming and eutrophication are two of the most important global change stressors for natural ecosystems, but their interaction is poorly understood. We used a dynamic model of complex, size-structured food webs to assess interactive effects on diversity and network structure. We found antagonistic impacts: Warming increases diversity in eutrophic systems and decreases it in oligotrophic systems. These effects interact with the community size structure: Communities of similarly sized species such as parasitoid-host systems are stabilized by warming and destabilized by eutrophication, whereas the diversity of size-structured predator-prey networks decreases strongly with warming, but decreases only weakly with eutrophication. Nonrandom extinction risks for generalists and specialists lead to higher connectance in networks without size structure and lower connectance in size-structured communities. Overall, our results unravel interactive impacts of warming and eutrophication and suggest that size structure may serve as an important proxy for predicting the community sensitivity to these global change stressors.

  • 2.
    Sentis, Arnaud
    et al.
    University of South Bohemia, Czech Republic; Biol Centre AS CR, Czech Republic; University of Toulouse III, France.
    Binzer, Amrei
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Biology. Linköping University, Faculty of Science & Engineering. Max Planck Institute Evolutionary Biol, Germany.
    Boukal, David S.
    University of South Bohemia, Czech Republic; Biol Centre AS CR, Czech Republic.
    Temperature-size responses alter food chain persistence across environmental gradients2017In: Ecology Letters, ISSN 1461-023X, E-ISSN 1461-0248, Vol. 20, no 7, p. 852-862Article in journal (Refereed)
    Abstract [en]

    Body-size reduction is a ubiquitous response to global warming alongside changes in species phenology and distributions. However, ecological consequences of temperature-size (TS) responses for community persistence under environmental change remain largely unexplored. Here, we investigated the interactive effects of warming, enrichment, community size structure and TS responses on a three-species food chain using a temperature-dependent model with empirical parameterisation. We found that TS responses often increase community persistence, mainly by modifying consumer-resource size ratios and thereby altering interaction strengths and energetic efficiencies. However, the sign and magnitude of these effects vary with warming and enrichment levels, TS responses of constituent species, and community size structure. We predict that the consequences of TS responses are stronger in aquatic than in terrestrial ecosystems, especially when species show different TS responses. We conclude that considering the links between phenotypic plasticity, environmental drivers and species interactions is crucial to better predict global change impacts on ecosystem diversity and stability.

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