Individual-based trait analyses reveal assembly patterns in tree sapling communities
Article first published online: 13 SEP 2011
© 2011 International Association for Vegetation Science
Journal of Vegetation Science
Volume 23, Issue 1, pages 176–186, February 2012
How to Cite
Carlucci, M. B., Streit, H., Duarte, L. D.S., Pillar, V. D. (2012), Individual-based trait analyses reveal assembly patterns in tree sapling communities. Journal of Vegetation Science, 23: 176–186. doi: 10.1111/j.1654-1103.2011.01339.x
- Issue published online: 9 JAN 2012
- Article first published online: 13 SEP 2011
- Manuscript Accepted: 2 AUG 2011
- Manuscript Received: 26 MAY 2011
- CNPq. Grant Number: 479083/2008-8
- CNPq. Grant Number: 306573/2009-1
- Araucaria angustifolia;
- Assembly rules;
- Biotic interactions;
- Campos grassland;
- Environmental filtering;
- Limiting similarity;
- Niche partitioning;
- Trait convergence;
- Trait divergence
Are trait-convergence assembly patterns (TCAP) and/or trait-divergence assembly patterns (TDAP) of tree sapling communities related to microhabitat gradients in forest patches? If so, which traits are related to such patterns? What are the niche mechanisms potentially responsible for community assembly?
Grassland–forest mosaic in Serra do Sudeste region, southern Brazil (ca. 30.8°S, 53.1°W).
We used individual-based trait information of 1132 tree saplings in 40 plots along gradients of canopy openness and grazing intensity in forest patches in southern Brazil. We used a trait-based approach, bypassing taxonomic identification, as a first assessment of sapling community assembly in forest patches.
Both TCAP and TDAP indicate niche mechanisms underlying assembly of tree sapling communities. Specific leaf area (SLA), mean leaf area (LA) and relative abundance of toothed leaf margin (TLM) maximized TCAP. SLA and TLM tended to increase under more closed canopies, whereas LA had higher values at intermediate canopy openness. SLA and LA maximized TDAP and tended to vary more in more closed canopies, whereas SLA and presence of spines, which also maximized TDAP, showed higher variation under lower grazing intensity.
The taxon-free approach was very useful to infer niche mechanisms of tree sapling assembly in forest patches. By adopting an individual-based trait approach, we assumed that both intra-specific and intra-population trait variability were relevant for revealing assembly patterns. We highlight that the use of individual-based trait data in a metacommunity framework is an excellent way to evaluate TCAP and TDAP at the metacommunity scale, since it takes into account the entire variation of traits throughout communities.