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Article
Biodiversity and Ecosystem Functioning: Importance of Species Evenness in an Old Field
Ecology (2000)
  • Brian J. Wilsey, McGill University
  • Catherine Potvin, McGill University
Abstract

Changes in land use, habitat fragmentation, nutrient enrichment, and environmental stress often lead to reduced plant diversity in ecosystems. However, it remains controversial whether these reductions in diversity will affect energy flow and nutrient cycling. Diversity has two components: species richness, or the number of plant species in a given area, and species evenness, or how well distributed abundance or biomass is among species within a community. We experimentally varied species evenness and the identity of the dominant plant species in an old field of Quebec to test whether plant productivity would increase with increasing levels of evenness, and whether relationships would be invariant with respect to species identity. Total and belowground biomass increased linearly with increasing levels of evenness after one growing season. These relationships did not depend on the identity of the dominant species. Relationships between aboveground biomass and evenness varied and depended on the identity of the dominant. Our results are largely consistent with the idea that humaninfluenced reductions in small-scale plant diversity, in this case evenness, will lead to indirect reductions in total primary productivity. Furthermore, because the evenness treatments were not confounded with species identity, our results suggest that diversity has an effect on plant productivity above and beyond the sampling effect (having a higher probability of species with higher growth rates in diverse communities) seen in studies that vary species richness.

Keywords
  • biodiversity and ecosystem functioning,
  • biomass and plant species evenness,
  • old fields,
  • plant community composition; productivity vs. plant diversity,
  • Quebec,
  • species evenness
Publication Date
2000
Citation Information
Brian J. Wilsey and Catherine Potvin. "Biodiversity and Ecosystem Functioning: Importance of Species Evenness in an Old Field" Ecology Vol. 81 Iss. 4 (2000)
Available at: http://works.bepress.com/brian_wilsey/28/