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Deterministic tropical tree community turnover: evidence from patterns of functional beta diversity along an
Nathan G Swenson1, Pedro Anglada-Cordero, John A Barone
1Department of Plant Biology, Michigan State University, East Lansing, MI 48824, USA. swensonn@msu.edu
Proceedings. Biological Sciences
|September 24, 2010
Summary
Tropical tree communities show decreasing functional similarity with elevation. This pattern supports deterministic assembly, not random chance, in diverse ecosystems.
Area of Science:
- Ecology
- Plant Community Ecology
- Biodiversity Research
Background:
- Understanding tropical tree diversity mechanisms is a key ecological challenge.
- Existing hypotheses include niche-based deterministic and dispersal-based stochastic models.
- Testing these requires detailed species functional trait information, often lacking population-level variability.
Purpose of the Study:
- To investigate functional beta diversity in tropical tree communities along an elevational gradient.
- To incorporate population-level trait variability into community assembly analyses.
- To determine if community assembly patterns are random or deterministic.
Main Methods:
- Quantified functional beta diversity across 15 tropical forest plots along an elevational gradient.
- Explicitly incorporated population-level trait variability, moving beyond species trait means.
- Analyzed trait dispersion and community similarity patterns in relation to elevation.
Main Results:
- Observed a significant pattern of decreasing functional similarity with increasing elevation.
- Demonstrated that patterns of functional beta diversity were non-random.
- Identified a strong link between elevation and functional community structure.
Conclusions:
- Results support a deterministic model for tropical tree community assembly and turnover.
- Elevational gradients significantly influence functional trait composition and diversity.
- Incorporating population-level trait variability provides a more robust understanding of community dynamics.
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