Abstract Detail

Biogeography

Lima , Jacira Rabelo [1], Tozzi , Ana Maria Goulart de Azevedo  [2], Mansano, Vidal de Freitas  [1].

Phylogenetic structure of Leguminosae assemblages in South America.

Leguminosae is found in various vegetation types in South America, occurring from seasonal to humid vegetation. The most severe conditions (higher temperatures and less precipitation) of the seasonal vegetation, when compared with the humid vegetation, can act as strong environmental filters for the species present there. Environments where the structuring forces are abiotic filters tend to present species with similar niches, and thus more phylogenetically related than expected by chance (clumped). Once the seasonal vegetation present in South America represents a more stressful environment compared to areas of humid vegetation, it is expected that these areas have a clumped phylogenetic structure. We carried out a survey of tree and shrub species of Leguminosae present in different vegetation in South America based on published works. A phylogenetic tree was calculated using the software package phylomatic Phylocom. The richness, diversity and phylogenetic structure (Phylogenetic Species Variability - PSV; Average Taxonomic Distinctness - ATD and Net Relatedness Index - NRI) were calculated using PAM software. Our revision inclued 328 areas studied, resulting 124 genera and 780 species. The driest areas present, in general, higher species richness and a clumped phylogenetic structure. This result suggests that, in these dry areas, the environmental filters are probably more important in structuring the community. For some areas of humid vegetation, the main structuring force is competition, which leads to an increase in the number of taxa of different lineages and a consequent over dispersion phylogenetic structure.

Broader Impacts:

1 - Instituto de Pesquisas Jardim Botânico do Rio de Janeiro , Rua: Pacheco Leão, 915, Jardim Botânico, Rio de Janeiro, Rio de Janeiro, 22460-030, Brazil
2 - Universidade Estadual de Campinas, Departamento de Biologia Vegetal, Rua: Monteiro Lobato, 255, Cidade Universitária "Zeferino Vaz", Campinas, São Paulo, 13083-970, Brazil

Keywords:
Leguminosae
environmental filters
phylogenetic structure
South America.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Khorassan Ballroom/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 5:30 PM
Number: PBG003
Abstract ID:997