Editor: Bill Shipley
Functional beta-diversity patterns reveal deterministic community assembly processes in eastern North American trees
Article first published online: 21 DEC 2012
© 2012 John Wiley & Sons Ltd
Global Ecology and Biogeography
Volume 22, Issue 6, pages 682–691, June 2013
How to Cite
Siefert, A., Ravenscroft, C., Weiser, M. D. and Swenson, N. G. (2013), Functional beta-diversity patterns reveal deterministic community assembly processes in eastern North American trees. Global Ecology and Biogeography, 22: 682–691. doi: 10.1111/geb.12030
- Issue published online: 5 MAY 2013
- Article first published online: 21 DEC 2012
- a National Science Foundation Graduate Research Fellowship
- Michigan State University
- Beta diversity;
- community assembly;
- eastern North America;
- environmental filtering;
- functional traits;
- species turnover;
- temperate forest;
Determining the relative influence of niche-based and neutral processes in driving the spatial turnover of community composition is a central challenge in community ecology. Spatial patterns of functional turnover, or functional beta diversity, may capture important signals of niche-based assembly processes, but these patterns have not been quantified for communities across broad geographic and environmental gradients. Here, we analyse continental-scale patterns of species and functional beta diversity in relation to space and the environment to assess the relative importance of niche-based and neutral community assembly mechanisms.
Eastern North America.
We use a continental-scale forest plot dataset and functional trait data to quantify spatial patterns of species and functional beta diversity. We use redundancy analysis-based variance partitioning to evaluate the influence of space, soil and climate on beta-diversity metrics. We use a null model approach to test for non-random functional beta diversity given the observed patterns of species turnover across spatial scales.
Species and functional beta diversity increased with increasing geographic distance (i.e. distance decay of community similarity). Results of variance partitioning analysis show that species and functional beta diversity were spatially structured and significantly related to environmental, particularly climatic, variation. Results of null model analysis show that functional beta diversity was lower than expected based on species turnover at fine scales (< 600 km) and higher than expected at broad scales (> 1800 km).
The observed patterns of functional beta diversity support a niche-based model of community assembly, driven by the deterministic filtering of species across environmental gradients based on their functional traits.