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Abundance and body size relationship in a bird community from Central Brazil Relacao entre abundancia e tamanho do corpo em uma comunidade de aves no Brasil Central



Abundance and body size relationship in a bird community from Central Brazil Relacao entre abundancia e tamanho do corpo em uma comunidade de aves no Brasil Central



Ararajuba. Junho; 101: 1-14



One of the most obvious variables that affect abundance is body size. The purpose of this study was to analyze the abundance - body size relationship in a local bird community from Central Brazil (Bonsucesso Farm. located in Caldazinha City, GO). The effects of the range center index (RCI) and phylogenetic structure on this relationship were evaluated. Linear transection was the methodology used to define checklist and estimate abundances. Body size data and phylogenetic hypothesis were obtained from the literature. The abundance and body size relationship for 124 species followed Brown and Maurer's model, that is defined by a polygonal constraint pattern with a negative relationship between maximum abundance and body size. So, the abundance - body size relationship does not follow a simple energetic equivalence rule. There was also an influence of the geographical distribution patterns, affecting two aspects: the rare species showed high RCI values, and so are more peripheral to the study site. There was a gradient of reduction of RCI values toward the superior limit of the constraint polygon. The influence of phylogeny was also important, and there was a change ir. the shape of the relationship according to the taxonomic level, with a significant and positive relationship for the Suboscine birds in the community. Thus, in phenotypically similar groups, larger species are more abundant, maybe because they are superior competitively. The constraint polygon was not revealed for data transformed according to phylogenetic independent contrasts and autorregressive method, probably because of the changes in patterns through time. Thus, all effects tested showed significant effects in the abundance and body size relationship but, like in many macroecological studies, the complex observed patterns are not easily explained in terms of their causal evolutionary and ecological mechanisms.

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