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Oecologia

, Volume 168, Issue 2, pp 533–548 | Cite as

Species traits and environmental conditions govern the relationship between biodiversity effects across trophic levels

  • Daniel E. Spooner
  • Caryn C. Vaughn
  • Heather S. Galbraith
Community ecology - Methods Paper

Abstract

Changing environments can have divergent effects on biodiversity–ecosystem function relationships at alternating trophic levels. Freshwater mussels fertilize stream foodwebs through nutrient excretion, and mussel species-specific excretion rates depend on environmental conditions. We asked how differences in mussel diversity in varying environments influence the dynamics between primary producers and consumers. We conducted field experiments manipulating mussel richness under summer (low flow, high temperature) and fall (moderate flow and temperature) conditions, measured nutrient limitation, algal biomass and grazing chironomid abundance, and analyzed the data with non-transgressive overyielding and tripartite biodiversity partitioning analyses. Algal biomass and chironomid abundance were best explained by trait-independent complementarity among mussel species, but the relationship between biodiversity effects across trophic levels (algae and grazers) depended on seasonal differences in mussel species’ trait expression (nutrient excretion and activity level). Both species identity and overall diversity effects were related to the magnitude of nutrient limitation. Our results demonstrate that biodiversity of a resource-provisioning (nutrients and habitat) group of species influences foodweb dynamics and that understanding species traits and environmental context are important for interpreting biodiversity experiments.

Keywords

Biodiversity partitioning Complementarity Ecosystem function Environmental context Freshwater Mollusk Nutrient limitation Species traits Trophic level 

Notes

Acknowledgments

We thank T. Garrett for allowing access to the field site, R. Deaton, S. and B. Dengler, D. Fenolio, S. Frazier, P. Jeyasingh, M. Jones, S. Jones, F. March, K. Reagan, R. Remington, and E. Webber for field and/or laboratory assistance, and D. Allen for comments on the manuscript. This study was funded by the National Science Foundation (DEB-0211010) and is a contribution to the program of the Oklahoma Biological Survey.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Daniel E. Spooner
    • 1
    • 2
  • Caryn C. Vaughn
    • 1
    • 3
  • Heather S. Galbraith
    • 1
    • 2
  1. 1.Oklahoma Biological Survey and Department of ZoologyUniversity of OklahomaNormanUSA
  2. 2.Northern Appalachian Research LaboratoryUnited States Geological SurveyWellsboroUSA
  3. 3.Graduate Program in Ecology and Evolutionary BiologyUniversity of OklahomaNormanUSA

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