Distribuição espacial e temporal de espécies simpátricas de Leptodactylus do grupo fuscus em áreas naturais e antrópicas na região de Itirapina e Brotas, sudoeste do Brasil / Spatial and temporal distribution of sympatric species of Leptodactylus group fuscus in natural and anthropic areas in Itirapina and Brotas region, southeast of Brazil

AUTOR(ES)

Hilton Masaharu Oyamaguchi

DATA DE PUBLICAÇÃO

2006

RESUMO

Anuran species inhabiting open landscapes are usually habitat generalists, so it is considered more tolerant to disturbed habitat. Although, the effect of habitat degradation on these open habitat species have been poorly documented. The goal of this study was to observe the effects of habitat modification caused by human on spatial and temporal distribution of sympatric species of Leptodactylus fuscus group (Leptodactylus fuscus, L. mystacinus, L. furnarius, L. jolyi) which are inhabiting open landscapes and are close related species. This study occurred in natural and modified open habitats of cerrado at southeast of the State of São Paulo, Brazil, between October of 2004 and February of 2005. The results of this study suggest that close related species, which present ecological similarities, can show differences on sensibility to habitat alteration. Among these four species which were object of this study, L. jolyi seems to be the most sensible to habitat degradation, which occurs only in natural habitats in Itirapina and Brotas region. Probably, these tolerance differences to habitat degradation could be related to niche breadth of each species. Therefore, generalizations about amphibians inhabiting open landscapes tolerance to habitat degradations should be avoided. On the other hand, the species that are more tolerant to habitat alteration may be favored by anthropic activities, as in urban areas, because in these places the resources could be more constant than in natural areas. This study observed that three species of Leptodactylus fuscus group which occur in urban areas (L. fuscus, L. mystacinus e L. furnarius) started first the vocalization activity and presented longer time of vocalization activities during the rainy season than in natural areas of cerrado. Perhaps this fact could reflect in bigger period of reproductive activity of these species and may result in a higher reproductive success; however it was not taken into consideration for the present research.

ASSUNTO(S)

open habitat leptodactylus leptodactylus ambiente aberto cerrado cerrado

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