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Biodiversity and ecosystem multifunctionality

Abstract

Biodiversity loss can affect ecosystem functions and services1,2,3,4. Individual ecosystem functions generally show a positive asymptotic relationship with increasing biodiversity, suggesting that some species are redundant5,6,7,8. However, ecosystems are managed and conserved for multiple functions, which may require greater biodiversity. Here we present an analysis of published data from grassland biodiversity experiments9,10,11, and show that ecosystem multifunctionality does require greater numbers of species. We analysed each ecosystem function alone to identify species with desirable effects. We then calculated the number of species with positive effects for all possible combinations of functions. Our results show appreciable differences in the sets of species influencing different ecosystem functions, with average proportional overlap of about 0.2 to 0.5. Consequently, as more ecosystem processes were included in our analysis, more species were found to affect overall functioning. Specifically, for all of the analysed experiments, there was a positive saturating relationship between the number of ecosystem processes considered and the number of species influencing overall functioning. We conclude that because different species often influence different functions, studies focusing on individual processes in isolation will underestimate levels of biodiversity required to maintain multifunctional ecosystems.

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Figure 1: Number of species with desirable effects on the suite of ecosystem processes measured in the different BIODEPTH project experiments.
Figure 2: Positive relationship between the range of ecosystem processes considered and the number of species that affect one or more aspect of ecosystem functioning.

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Acknowledgements

We thank the BIODEPTH project members for releasing this data on Ecological Archives, E. Bazeley-White and L. Wacker for data management, M. Weilenmann for help with the manuscript, L. Jackson and the participants of the DIVERSITAS-BioMERGE 2006 workshop for discussion; W. Venables for advice on stepAIC; and M. Loreau, B. Schmid and L. Turnbull for comments.

Author Contributions The two-stage analysis of multifunctionality was conceived by A.H., the mathematical formulation by R.B., and the analysis and writing was performed jointly.

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Correspondence to Andy Hector.

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This file contains Supplementary Notes, Supplementary Table S1 and Supplementary Figures S1-S6 with Legends. (PDF 196 kb)

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Hector, A., Bagchi, R. Biodiversity and ecosystem multifunctionality. Nature 448, 188–190 (2007). https://doi.org/10.1038/nature05947

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