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Composição e dinâmica da avifauna da mata de Santa Genebra, Campinas, São Paulo, Brasil

Composition and dynamics of the bird community of mata de Santa Genebra, Campinas, São Paulo, Brazil

Resumo

A quali-quantitative survey of avifauna was earried out at the Santa Genebra forest reserve (MSG) in order to evaluate the current state of conservation of this important conservation area in the interior of São Paulo Stale. The qualilative survey recorded 134 species and the quantitativo survey through unlimited distance point counts recorded the abundance of 97 species. The low number of species recorded in both surveys was due to the small size (251 ha) and the high degree of isolation of the MSG. These factors plus the extensivo degradation of the forest cover prevent recolonization of extinct species and allow the expansion of some species tolerant to disturbance. The quantitative survey showed some species with an unusually high abundance index. The abundance of most species at MSG is higher whon compared with other areas of similar vegetation which are not fragmented and isolated, There was no striking seasonal variation in the number of birds recorded. These caracteristics could be interpreted as resulting from the density compensation phenomenon. The structure of the bird community of MSG resembles that from an island with low number of species but overall density similar to that of the mainland, leading to a higher density per species. The process responsible for these patterns seems to be related to the habitat appropriateness, mainly because the MSG is completely isolated from other forest arcas.

Bird community; unlimited distance point counts; forest fragmentation; density compensation


Bird community; unlimited distance point counts; forest fragmentation; density compensation

Composição e dinâmica da avifauna da mata de Santa Genebra, Campinas, São Paulo, Brasil

Composition and dynamics of the bird community of mata de Santa Genebra, Campinas, São Paulo, Brazil

Alexandre Aleixo; Jacques M.E. Vielliard

Departamento de Zoologia, Universidade Estadual de Campinas. Caixa Postal 6109. 13083-970 Campinas. São Paulo. Brasil

ABSTRACT

A quali-quantitative survey of avifauna was earried out at the Santa Genebra forest reserve (MSG) in order to evaluate the current state of conservation of this important conservation area in the interior of São Paulo Stale. The qualilative survey recorded 134 species and the quantitativo survey through unlimited distance point counts recorded the abundance of 97 species. The low number of species recorded in both surveys was due to the small size (251 ha) and the high degree of isolation of the MSG. These factors plus the extensivo degradation of the forest cover prevent recolonization of extinct species and allow the expansion of some species tolerant to disturbance. The quantitative survey showed some species with an unusually high abundance index. The abundance of most species at MSG is higher whon compared with other areas of similar vegetation which are not fragmented and isolated, There was no striking seasonal variation in the number of birds recorded. These caracteristics could be interpreted as resulting from the density compensation phenomenon. The structure of the bird community of MSG resembles that from an island with low number of species but overall density similar to that of the mainland, leading to a higher density per species. The process responsible for these patterns seems to be related to the habitat appropriateness, mainly because the MSG is completely isolated from other forest arcas.

Key words: Bird community, unlimited distance point counts, forest fragmentation. density compensation

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Recebido em 25.X.1994; aceito em 19.IX.1995.

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Datas de Publicação

  • Publicação nesta coleção
    21 Jul 2009
  • Data do Fascículo
    Set 1995

Histórico

  • Recebido
    25 Out 1994
  • Aceito
    19 Set 1995
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