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More diverse plant communities have higher functioning over time due to turnover in complementary dominant species.

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2011
Author Allan Eric, Weisser Wolfgang, Weigelt Alexandra, Roscher Christiane, Fischer Markus, Hillebrand Helmut,
Project Mechanisms underlying plant community productivity, stability and assembly (D-A-CH/LAE)
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Original article (peer-reviewed)

Journal Proceedings of the National Academy of Sciences of the United States of America
Volume (Issue) 108(41)
Page(s) 17034 - 9
Title of proceedings Proceedings of the National Academy of Sciences of the United States of America
DOI 10.1073/pnas.1104015108


More diverse communities have been shown to have higher and more temporally stable ecosystem functioning than less diverse ones, suggesting they should also have a consistently higher level of functioning over time. Diverse communities could maintain consistently high function because the species driving function change over time (functional turnover) or because they are more likely to contain key species with temporally stable functioning. Across 7 y in a large biodiversity experiment, we show that more diverse plant communities had consistently higher productivity, that is, a higher level of functioning over time. We identify the mechanism for this as turnover in the species driving biomass production; this was substantial, and species that were rare in some years became dominant and drove function in other years. Such high turnover allowed functionally more diverse communities to maintain high biomass over time and was associated with higher levels of complementarity effects in these communities. In contrast, turnover in communities composed of functionally similar species did not promote high biomass production over time. Thus, turnover in species promotes consistently high ecosystem function when it sustains functionally complementary interactions between species. Our results strongly reinforce the argument for conservation of high biodiversity.