Journal of Plant Ecology Advance Access originally published online on February 25, 2008
Journal of Plant Ecology 2008 1(1):59-65; doi:10.1093/jpe/rtm004
| ||||||||||||||||||||||||||||||||||||||||||||||||||
Hierarchical reliability in experimental plant assemblages
1 Department of Ecology, Evolution, and Environmental Biology, Columbia University, New York, NY 10027, USA
2 Department of Ecology, Peking University, Beijing 100871, China
3 Institute of Environmental Sciences, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
4 Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA
5 Department of Biology, College of the Holy Cross, Worcester, MA 01610, USA
* Correspondence address. Department of Ecology, Evolution, and Environmental Biology, Columbia University, New York, NY 10027, USA. Tel: 212-854-9987; Fax: 212-854-8188; E-mail: dff2101{at}columbia.edu
Aims: The mechanism by which species richness affects variation in ecosystem functioning both within and among ecosystems remains a key question at the interface of community and ecosystem ecology. Statistical averaging (the smoothing of average system performance via consideration of additional components) and the insurance effect (reduced variation in system performance by inclusion of asynchronously varying components) predict that more diverse communities should vary less both between replicates and internally. We experimentally tested these theories in small plant assemblages.
Methods: We constructed plant assemblages modeled after old-field plant communities. We varied species richness, species composition and initial densities while holding functional group richness constant in replicate assemblages under glasshouse conditions.
Important findings: The inverse of the coefficient of variation of aboveground biomass production, a proxy measure of reliability, increased with higher diversity when examined at the level of the assemblage (i.e. among-replicate assemblages) but not at the levels of functional group or species. These stabilizing processes were weakest in low-diversity, low-density assemblages. This experiment demonstrates the utility of hierarchical analysis of ecosystem reliability at the assemblage, functional group and species level.
Keywords: ecosystem reliability • species richness • community density • functional group • ecosystem functioning