Abstract
The magnitude and frequency of extreme weather events are predicted to increase in the future due to ongoing climate change. In particular, floods and droughts resulting from climate change are thought to alter the ecosystem functions and stability. However, knowledge of the effects of these weather events on soil fauna is scarce, although they are key towards functioning of terrestrial ecosystems. Plant species richness has been shown to affect the stability of ecosystem functions and food webs. Here, we used the occurrence of a natural flood in a biodiversity grassland experiment that was followed by a simulated summer drought experiment, to investigate the interactive effects of plant species richness, a natural flood, and a subsequent summer drought on nematode communities. Three and five months after the natural flooding, effects of flooding severity were still detectable in the belowground system. We found that flooding severity decreased soil nematode food-web structure (loss of K-strategists) and the abundance of plant feeding nematodes. However, high plant species richness maintained higher diversity and abundance of higher trophic levels compared to monocultures throughout the flood. The subsequent summer drought seemed to be of lower importance but reversed negative flooding effects in some cases. This probably occurred because the studied grassland system is well adapted to drought, or because drought conditions alleviated the negative impact of long-term soil waterlogging. Using soil nematodes as indicator taxa, this study suggests that high plant species richness can maintain soil food web complexity after consecutive environmental perturbations.
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Acknowledgements
The Jena Experiment is funded by the Deutsche Forschungsgemeinschaft (FOR 1451). Marcel Ciobanu gratefully acknowledges the financial support by the Transnational Access to Research Infrastructures activity in the 7th Framework Programme of the European Community under the Experimentation in Ecosystem Research (ExpeER) project for conducting the research. Further support came from the German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, funded by the German Research Foundation (FZT 118). We thank Ilka Wolf, Sylvia Creutzburg and Silke Schroeckh for their help during field sampling, as well as Laura Naujoks (nematode extraction) and Daniela Wagner (nematode counting).
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AV designed and established the drought experiment; AE, NE and WWW were responsible for the maintenance of the Jena Experiment; NE, MC and SC conceived and designed this study; MC conducted fieldwork, SC analyzed the data. SC and MC wrote the first draft of the manuscript with substantial input of AJW; all authors contributed to revisions.
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Communicated by Liliane Ruess.
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Cesarz, S., Ciobanu, M., Wright, A.J. et al. Plant species richness sustains higher trophic levels of soil nematode communities after consecutive environmental perturbations. Oecologia 184, 715–728 (2017). https://doi.org/10.1007/s00442-017-3893-5
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DOI: https://doi.org/10.1007/s00442-017-3893-5