Interactive effects of warming, eutrophication and size structure: impacts on biodiversity and food-web structure

Binzer, AmreiLinköpings universitet,Teoretisk Biologi,Tekniska fakulteten,University of Gottingen, Germany (author)

Funding Agencies|German Research Foundation [BR 2315/11-1]; German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig - German Research Foundation [FZT 118]; Leopoldina Fellowship Programme [LPDS 2012-07]
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.

NATURVETENSKAP Biologi hsv//swe
NATURAL SCIENCES Biological Sciences hsv//eng
complex food webs; extinctions; generalists; global change; size structure; specialists

Guill, ChristianUniversity of Gottingen, Germany; University of Potsdam, Germany; University of Amsterdam, Netherlands (author)
Rall, Bjoern C.University of Gottingen, Germany; German Centre Integrat Biodivers Research iDiv, Germany; University of Jena, Germany (author)
Brose, UlrichUniversity of Gottingen, Germany; German Centre Integrat Biodivers Research iDiv, Germany; University of Jena, Germany (author)
Linköpings universitetTeoretisk Biologi (creator_code:org_t)

By the author/editor: Binzer, Amrei; Guill, Christian; Rall, Bjoern C.; Brose, Ulrich

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