Literaturdatenbank
Literaturdatenbank |
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Bujes, C. S., Molina, F. B., & Verrastro, L. (2011). Population characteristics of trachemys dorbigni (testudines, emydidae) from delta do jacuí state park, rio grande do sul, southern brazil. South American Journal of Herpetology, 6(1), 27–34.
Added by: Admin (06 Jan 2014 18:24:10 UTC) |
| Resource type: Journal Article DOI: 10.2994/057.006.0104 BibTeX citation key: Bujes2011 View all bibliographic details  |
Categories: General Keywords: Emydidae, Habitat - habitat, Schildkröten - turtles + tortoises, Südamerika - South America, Trachemys dorbigni Creators: Bujes, Molina, Verrastro Collection: South American Journal of Herpetology |
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| Abstract |
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Seasonal distribution, size classes, density, biomass, population structure, and sex ratio of Trachemys dorbigni were investigated in Delta do Jacuí State Park, Rio Grande do Sul – Brazil, between 2003 and 2006 using mark-recapture methods. A total of 137 Trachemys dorbigni individuals were captured: 93 females, 30 males, and 14 undetermined. Recapture rate was 5.1%, with a total of 7 recaptures (one animal was recaptured twice and 5 other animals were recaptured once). Individuals in these populations were active between August and April, and no turtles were captured in February. Sexual dimorphism index (i.e., females’ carapace length divided by males’ carapace length) was 1.13, and females were bigger than males in all analyzed variables, except tail base to the cloaca opening length. Density was 7.61 turtles/ha, and biomass was 8.71 kg/ha. The distribution of body size classes revealed revealed that the samples were composed mainly of adults (89.78%). Sex ratio was different from 1:1 (3:1; χ2 = 32,27; df = 1; p < 0.001).
Added by: Admin |