The British Herpetological Society

The Herpetological Journal is the Society's prestigious quarterly scientific journal. Articles are listed in Biological Abstracts, Current Awareness in Biological Sciences,Current Contents, Science Citation Index, and Zoological Record.

 ISSN 0268-0130

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pdf 09. Trachemys dorbigni in an anthropic environment in southern Brazil: I) Sexual size dimorphism and population estimates


Open Access

pp. 185-193
Authors: Fagundes, Camila Kurzmann; Bager, Alex & Cechin, Sonia Terezinha Zanini

Abstract: Trachemys dorbigni is the southernmost species of its genus, and is subject to strong pressure from harvesting for the pet trade. We collected 377 individuals of T. dorbigni in an urban marsh in southern Brazil between February 2006 and January 2007, to document sexual dimorphism and to provide data on the structure of the population. The sex ratio was not different from 1:1. Animals that exceeded 127 cm in carapace length (CL) were considered adults. Females were, on average, heavier and larger than males but had a smaller carapace and plastron terminal distance (CPD). The weekly recapture probability for juveniles was constant (4%). However, adults varied in weekly recapture probability, which may be associated with their reproductive behaviour. Weekly survival was constant for juveniles (94%) and adults (97%). Future investigations should analyse how survival and recapture fluctuate in an environment where a large proportion of the eggs and young are collected for the pet trade.


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