Literaturdatenbank
Literaturdatenbank |
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Willoughby, J. R. (2012). Demographic and genetic status of the wood turtle in the lower peninsula of michigan. Unpublished thesis , Central Michigan University, Mount Pleasant, Michigan.
Added by: Admin (06 Jan 2014 18:23:15 UTC) |
| Resource type: Thesis/Dissertation BibTeX citation key: anon2012.14772 View all bibliographic details  |
Categories: General Keywords: Emydidae, Genetik - genetics, Glyptemys insculpta, Habitat - habitat, Nordamerika - North America, Schildkröten - turtles + tortoises Creators: Willoughby Publisher: Central Michigan University (Mount Pleasant, Michigan) |
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| Abstract |
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Populations of wood turtles, Glyptemys insculpta, have steadily decreased over the past 30 years due to the destruction and degradation of necessary habitat. We sampled wood turtles from three areas in Michigan, USA to determine the number of and distribution of populations, quantify demographic trends, and measure the effect of declining population size on genetic diversity. Wood turtle samples (n=68) were collected from 3 rivers in the Lower Peninsula of Michigan and analyzed at 9 microsatellite loci. The programs Structure and Baps identified 2 populations that split sampling sites between a North and South population. In both populations, MSVar analysis of genealogies estimated r<0, indicating demographic decline. Although no evidence of a bottleneck was detected using the program Bottleneck (p=0.303 North, p=0.290 South), I did find some evidence of inbreeding (average North FIS=0.25, average South FIS=0.23). The relatively high genetic diversity observed in the North and South populations, an uncommon characteristic of declining populations, is likely due to immigration between the two populations (FST=0.043) coupled with the long lifespan of the wood turtle. The steady demographic decline observed and the slow loss of genetic diversity presents a unique conservation opportunity to improve populations demographically without the added cost and considerations necessary in the conservation of genetically depauperate populations.
Added by: Admin |