The Upper Paraná River floodplain is inserted in a region of the Mata Atlântica biome, which is a critical area to preserve. Due to the scarcity of researches about the chiropterofauna in this region, the present study investigated species richness and abundance of bats in remnants from the stational semidecidual forest of the Upper Paraná River, southern Brazil. Samplings were taken every month, from January to December 2006, using 32 mist nets with 8.0 × 2.5 m, resulting in 640 m 2 /h and totaling a capture effort of 87,040 m 2 /h. In order to estimate the species richness, the following estimators were employed Chao1 and Jack2. During the study, a total of 563 individuals belonging to 17 species (Artibeus planirostris, Artibeus lituratus, Carollia perspicillata, Platyrrhinus lineatus, Sturnira lilium, Artibeus fimbriatus, Myotis nigricans, Desmodus rotundus, Artibeus obscurus, Noctilio albiventris, Phylostomus discolor, Phylostomus hastatus, Chrotopterus auritus, Lasiurus ega, Chiroderma villosum, Pygoderma bilabiatumand Lasiurus blossevillii) were captured. The estimated richness curves tended to stabilize, indicating that most of the species were sampled. Captured species represented 10% of the taxa recorded in Brazil and 28% in Paraná State, revealing the importance of this area for the diversity of bats. These findings indicate the need to determine actions aiming to restrict human activities in these forest fragments, in order to minimize anthropogenic impacts on the chiropterofauna.Keywords: chiropterofauna, diversity, forest remnants, fragmentation. Riqueza e abundância de espécies de morcegos em fragmentos de floresta estacional semidecidual do Alto Rio Paraná, sul do Brasil ResumoA planície de inundação do Alto Rio Paraná está inserida em uma região de bioma Mata Atlântica, área crítica para preservação. Pela carência de pesquisas acerca da quiropterofauna da região, o presente estudo investigou a riqueza e abundância de morcegos em remanescentes de floresta estacional semidecidual do alto rio Paraná, sul do Brasil. As amostragens foram realizadas mensalmente, de janeiro e dezembro de 2006, com a utilização de 32 redes de neblina com 8,0 × 2,5 m, resultando em 640 m 2 /h e totalizando um esforço de captura de 87.040 m 2 /h. Para a estimativa da riqueza foram utilizados os estimadores Chao1 e Jack2. Durante o estudo um total de 563 indivíduos pertencentes a 17 espécies (Artibeus planirostris, Artibeus lituratus, Carollia perspicillata, Platyrrhinus lineatus, Sturnira lilium, Artibeus fimbriatus, Myotis nigricans, Desmodus rotundus, Artibeus obscurus, Noctilio albiventris, Phylostomus discolor, Phylostomus hastatus, Chrotopterus auritus, Lasiurus ega, Chiroderma villosum, Pygoderma bilabiatum e Lasiurus blossevillii) foram capturados. As curvas de riqueza estimada tenderam à estabilidade, indicando que a maioria das espécies foi amostrada. As espécies capturadas representaram 10% dos táxons registrados para o Brasil e 28% para o estado do Paraná, revelando a importância dessa área para a divers...
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