Literaturdatenbank
Literaturdatenbank |
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Silveira, M. L., Hartmann, M. T., & Bager, A. (2012). Biometrics, sex ratio and sexual dimorphism of trachemys dorbigni (duméril & bibron 1835) (testudines, emydidae) from an artificial reservoir in the municipality of são gabriel, rio grande do sul, brazil. Biotemas, 25(3), 187–193.
Added by: Sarina Wunderlich (18 Nov 2012 17:47:04 UTC) |
| Resource type: Journal Article DOI: 10.5007/2175-7925.2012v25n3p187 BibTeX citation key: Silveira2012 View all bibliographic details  |
Categories: General Keywords: Emydidae, Fortpflanzung = reproduction, Habitat = habitat, Morphologie = morphology, Schildkröten = turtles + tortoises, Südamerika = South America, Trachemys, Trachemys dorbigni Creators: Bager, Hartmann, Silveira Collection: Biotemas |
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| Abstract |
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Biometrics, sex ratio and sexual dimorphism of Trachemys dorbigni (Duméril & Bibron 1835) (Testudines, Emydidae) from an artificial reservoir in the municipality of São Gabriel, Rio Grande do Sul, Brazil. This work describes the population structure of Trachemys dorbigni from an artificial reservoir (30º20’16,03”S, 54º15’46,68”W) in the municipality of São Gabriel, Rio Grande do Sul, Brazil. From March 2009 to February 2010, forty-four individuals were collected: 34 females, seven males, and three juveniles. The sex ratio was 4.85 females: 1 male (1:1). The mean carapace length of the adults was 190.50 ± 22.81mm (N=41) and the mean body mass was 1.210 ± 420g (N=37). Carapace length averaged 179.10 ± 18.60mm (N =7) for males and 192.90 ± 23.10mm (N=34) for females. Females were significantly larger than males for six of the eleven measurements made and smaller for one measurement, which was the distance from the base of tail to the cloacae. The discriminant analysis revealed significant morphological differences between males and females (P<0,05; F3.37=21.02; Wilks’ lambda=0.36), indicating carapace and plastron terminal distance, curvilinear carapace length and distance from the base of tail to the cloacae as important variables for sexing this species.
Added by: Sarina Wunderlich |