O valor de corredores florestais para a conservação de aves em paisagens fragmentadas / The value of forest corridors to bird conservation in fragmented landscapes

AUTOR(ES)

Carlos Ernesto Candia Gallardo

DATA DE PUBLICAÇÃO

2011

RESUMO

Habitat loss and fragmentation are major threats to biodiversity. Habitat corridors linking remnants are a popular strategy to reduce the negative effects of habitat loss and fragmentation. However, the evaluation of the effectiveness of corridors in conservation is limited by lack of empirical evidence, especially in the neotropics. In this thesis we empirically evaluated the importance of forest corridors as habitats and movement conduits for forest birds in fragmented Atlantic Forest landscapes. With an observational study at the community level we evaluated the effects of corridor width and type (riparian or non-riparian) on forest bird richness and composition. Under an experimental approach at the individual level we evaluated how the presence or absence of corridors and gender affected the movements of an understory bird endemic to the Atlantic Forest (Pyriglena leucoptera, Passeriformes, Thamnophilidae). We found that forest bird richness and composition were strongly affected by corridor width (but not by type). Wide corridors (>100 m) were able to harbor many forest species, whereas narrower corridors harbored and non-random and restrict group of common species. Therefore narrow corridor would have a limited value as habitats for forest species. We also found that corridors increased P. leucoptera movements and that open areas decreased them, especially for male individuals. There are evidence that corridors could increase the persistence probability of P. leucoptera in fragmented landscapes. The results of both studioes provide evidence that forest corridors are useful tools for maintain forest bird diversity in Atlantic forest fragmented landscapes.

ASSUNTO(S)

avifauna birds corredores corridors dispersal dispersão fragmentação fragmentation pyriglena leucoptera pyriglena leucoptera rádio-telemetria radiotracking

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