Literaturdatenbank
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Selman, W., Qualls, C. P., & Kreiser, B. R. , Is there a population structure in the yellow-blotched sawback turtle (graptemys flavimaculata) in a seemingly continuous environment? Paper presented at Turtle Survival Alliance 2006 Annual Meeting.
Added by: Admin (13 Dec 2008 22:23:55 UTC) |
| Resource type: Proceedings Article BibTeX citation key: Selman2006 View all bibliographic details  |
Categories: General Keywords: Emydidae, Genetik = genetics, Graptemys, Graptemys flavimaculata, Graptemys oculifera, Habitat = habitat, Nordamerika = North America, Schildkröten = turtles + tortoises Creators: Kreiser, Qualls, Selman Collection: Turtle Survival Alliance 2006 Annual Meeting |
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| Abstract |
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The yellow-blotched sawback turtle (Graptemys flavimaculata) is a freshwater aquatic turtle that is endemic to the Pascagoula River system of southern Mississippi, USA. Population declines led to Federal listing as a threatened species in 1991, as well as being listed by the Turtle Conservation Fund/ IUCN as one of the 25 most endangered turtles in the world. However, no research has focused on the population structure of this species. Population structure will be assessed by using morphometric and genetic analyses (microsatellites). During the spring and summer of 2005, we conducted research at three sites in the Pascagoula River basin: (1) north of Hattiesburg, MS, on the Leaf River; (2) south of Leakesville, MS, on the Chickasawhay River; and (3) east of Vancleave, MS, on the lower Pascagoula River. An additional study site on the Pearl River was included using the sister species, the ringed sawback turtle (Graptemys oculifera), for morphometric and genetic comparison. Turtles were trapped by using basking traps attached to turtle basking structures. When later approached by boat, turtles were startled into the traps and quickly removed. Once removed from the trap, 1 mL of blood was collected, as well as morphometric data. Morphometric analyses of carapace length using a two factor ANOVA indicated that G. flavimaculata have significantly larger carapace lengths than G. oculifera (F 3,316 = 10.86, p = 0.0011). Additionally, there was a significant difference in carapace lengths between the three sites for G. flavimaculata (F 3, 221 = 3.76, p = 0.02), with Vancleave females and males being the largest. Preliminary analysis of the microsatellite data for G. flavimaculata suggests that there could be genetic differentiation among the three different sites, with more extensive data to be presented.
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