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The results of biodiversity–ecosystem functioning experiments are realistic

Research output: Contribution to journalArticle

Malte Jochum, Markus Fischer, Forest Isbell, Christiane Roscher, Fons van der Plas, Steffen Boch, Gerhard Boenisch, Nina Buchmann, Jane A. Catford, Jeannine Cavender-Bares, Anne Ebeling, Nico Eisenhauer, Gerd Gleixner, Norbert Hölzel, Jens Kattge, Valentin H. Klaus, Till Kleinebecker, Markus Lange, Gaëtane Le Provost, Sebastian T. Meyer & 18 more Rafael Molina-Venegas, Liesje Mommer, Yvonne Oelmann, Caterina Penone, Daniel Prati, Peter B. Reich, Abiel Rindisbacher, Deborah Schäfer, Stefan Scheu, Bernhard Schmid, David Tilman, Teja Tscharntke, Anja Vogel, Cameron Wagg, Alexandra Weigelt, Wolfgang W. Weisser, Wolfgang Wilcke, Peter Manning

Original languageEnglish
JournalNature Ecology and Evolution
DOIs
Accepted/In press1 Jan 2020

King's Authors

Abstract

A large body of research shows that biodiversity loss can reduce ecosystem functioning. However, much of the evidence for this relationship is drawn from biodiversity–ecosystem functioning experiments in which biodiversity loss is simulated by randomly assembling communities of varying species diversity, and ecosystem functions are measured. This random assembly has led some ecologists to question the relevance of biodiversity experiments to real-world ecosystems, where community assembly or disassembly may be non-random and influenced by external drivers, such as climate, soil conditions or land use. Here, we compare data from real-world grassland plant communities with data from two of the largest and longest-running grassland biodiversity experiments (the Jena Experiment in Germany and BioDIV in the United States) in terms of their taxonomic, functional and phylogenetic diversity and functional-trait composition. We found that plant communities of biodiversity experiments cover almost all of the multivariate variation of the real-world communities, while also containing community types that are not currently observed in the real world. Moreover, they have greater variance in their compositional features than their real-world counterparts. We then re-analysed a subset of experimental data that included only ecologically realistic communities (that is, those comparable to real-world communities). For 10 out of 12 biodiversity–ecosystem functioning relationships, biodiversity effects did not differ significantly between the full dataset of biodiversity experiments and the ecologically realistic subset of experimental communities. Although we do not provide direct evidence for strong or consistent biodiversity–ecosystem functioning relationships in real-world communities, our results demonstrate that the results of biodiversity experiments are largely insensitive to the exclusion of unrealistic communities and that the conclusions drawn from biodiversity experiments are generally robust.

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