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Estimating Juvenile Abundance in a Population of the Semiaquatic Caecilian, Chthonerpeton indistinctum (Amphibia: Gymnophiona: Typhlonectidae), in Southern Brazil

The Society for the Study of Amphibians and Reptiles
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Abstract Chthonerpeton indistinctum is nontropical, and reports suggest a distinct breeding season, allowing the potential for estimation of reproductive success. A total of 67 juvenile (and four adult) C. indistinctum were captured over five visits to a site in Rio Grande do Sul, Brazil, during Winter 2001. All individuals were marked and released, and the seven juveniles recaptured allowed a Schnabel estimate of 161.0 (95% confidence limits 81.9–343.1), the first quantitive estimate of juvenile caecilian abundance. However, the large size range of juveniles caught suggests that growth rates of individuals are highly variable or that C. indistinctum does not have a distinct breeding period in this region.

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