Article first published online: 14 SEP 2012
© 2012 The Authors. New Phytologist © 2012 New Phytologist Trust
Volume 196, Issue 3, pages 824–834, November 2012
How to Cite
Schöb, C., Butterfield, B. J. and Pugnaire, F. I. (2012), Foundation species influence trait-based community assembly. New Phytologist, 196: 824–834. doi: 10.1111/j.1469-8137.2012.04306.x
- Issue published online: 9 OCT 2012
- Article first published online: 14 SEP 2012
- Manuscript Accepted: 1 AUG 2012
- Manuscript Received: 30 MAY 2012
- MICINN. Grant Number: CGL2010-17081
- Organismo Autónomo Parques Nacionales. Grant Number: 0002/9
- Swiss National Science Foundation. Grant Number: PBBEP3_128361
- community assembly;
- functional traits;
- intraspecific variability;
- niche theory;
- plant–plant interactions
- Here, we incorporate facilitation into trait-based community assembly theory by testing two mutually compatible facilitative mechanisms: changes in the environmental filter, causing either an increase in the range of trait values (i.e. a range expansion effect) and/or a shift in trait distributions (i.e. a range shift effect); and changes in trait spacing, suggesting an effect on niche differentiation.
- We analyzed the distribution of three functional traits – leaf dry matter content, specific leaf area and lateral spread – of plant communities dominated by a cushion-forming foundation species at four sites differing in elevation and aspect.
- We found support for environmental filtering and niche differentiation mechanisms by cushions, with filtering effects (in particular range shifts) increasing with environmental severity at higher elevation. The effect size of cushions on trait distribution was similar to that of environmental gradients caused by elevation and aspect. The consideration of intraspecific trait variability improved the detection of cushion effects on trait distributions.
- Our results highlight the importance of facilitation in the modification of taxonomic and functional diversity of ecological communities, and indicate that facilitation can occur through combined effects on environmental filtering and niche differentiation, with strong environmental context dependence of each mechanism.