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Diaz-Paniagua, C., Hidalgo-Vila, J., Marco, A., Andreu, A. C., & Portheault, A. (2006). Characteristics of two reproductive populations of the red-eared turtle, trachemys scripta elegans, in southwestern spain. caracteristicas de nos poblaciones reproductoras del galapago de florida, trachemys scripta elegans, en el suroeste de espana. Revista Española de Herpetología, 20, 5–16. 
Added by: Admin (14 Aug 2008 20:34:34 UTC)
Resource type: Journal Article
BibTeX citation key: PerezSantigosa2006c
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Categories: General
Keywords: Emydidae, Emys, Emys orbicularis, Fortpflanzung = reproduction, Geoemydidae, Habitat = habitat, Mauremys, Mauremys leprosa, Schildkröten = turtles + tortoises, Südwesteuropa = South-Western Europe, Trachemys, Trachemys scripta
Creators: , Andreu, Diaz-Paniagua, Hidalgo-Vila, Marco, Portheault
Collection: Revista Española de Herpetología
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Between 2000 and 2005, 197 and 227 individuals of Trachemys scripta elegans were captured in two lagoons in Huelva, where there are also authoctonous species (Mauremys leprosa and Emys orbicularis). Sex-ratio was even in one of the exotic species population while females outnumbered males in the other. Sexual dimorphism was found, with females reaching larger body size (mean carapace length = 211.5 mm and mean body mass = 1422.4 g) than males (mean carapace length = 169.6 mm and mean body mass = 670.7 g). The largest individual was a female of 257 mm carapace length and 2700 g body mass. The oldest individual (age recorded by skeletochronology) were a nine year old female in one locality, and a 10 year old female in the other. The 2003 age distribution was mostly composed of individuals of age classes 3-5 years. Successful reproduction was confirmed through the presence of 1-3 years individuals in the lagoons, as well as by the observation of a large number of nests and by the emergence of hatchlings from field incubated nests. Exotic turtles were active from February through November, showing maximum activity in summer and early autumn. According to the age structure of these populations and to the first observations of exotic turtles in these two lagoons, we consider that these naturalized populations originated with the release of pet turtles approximately in 1995, or even earlier. In both study sites, the population size of the exotic species was larger than 200 turtles in about 10 years. Exotic turtles outnumbered autochthonous species in one of these localities.
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