Experimental niche evolution alters the strength of the diversity–productivity relationship

Abstract

The relationship between biodiversity and ecosystem functioning (BEF) has become a cornerstone of community and ecosystem ecology1,2,3 and an essential criterion for making decisions in conservation biology and policy planning4,5. It has recently been proposed that evolutionary history should influence the BEF relationship because it determines species traits and, thus, species’ ability to exploit resources6,7. Here we test this hypothesis by combining experimental evolution with a BEF experiment. We isolated 20 bacterial strains from a marine environment and evolved each to be generalists or specialists8. We then tested the effect of evolutionary history on the strength of the BEF relationship with assemblages of 1 to 20 species constructed from the specialists, generalists and ancestors9. Assemblages of generalists were more productive on average because of their superior ability to exploit the environmental heterogeneity10. The slope of the BEF relationship was, however, stronger for the specialist assemblages because of enhanced niche complementarity. These results show how the BEF relationship depends critically on the legacy of past evolutionary events.

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Figure 1: Theoretical predictions of the effect of niche specialization on the strength of the BEF relationship.
Figure 2: Evolutionary treatments affect the strength of the biodiversity–productivity relationships.
Figure 3: The relationship between NDI and ecosystem functioning.

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Acknowledgements

We thank T. Barraclough, G. Bell, M. Loreau, R. C. MacLean and A. Paquette for comments on earlier versions of the manuscript. This work was supported by a fellowship from the Natural Sciences and Engineering Research Council of Canada and a research grant from the Canada Research Chair Program, to D.G., and research grant ANR-09-JCJC-0110-01, to N.M.

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D.G., T. Bell, C.B., T. Bouvier, T.P., P.V. and N.M. designed the research; D.G., C.B., T.P., P.V., T. Bell and N.M. conducted the research; and D.G., T. Bell and N.M. contributed to the model, analytical tools and wrote the manuscript. D.G., T. Bell, C.B., T. Bouvier, T.P., P.V. and N.M. edited the manuscript.

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Correspondence to Dominique Gravel or Nicolas Mouquet.

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The authors declare no competing financial interests.

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Gravel, D., Bell, T., Barbera, C. et al. Experimental niche evolution alters the strength of the diversity–productivity relationship. Nature 469, 89–92 (2011). https://doi.org/10.1038/nature09592

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