Literaturdatenbank
Literaturdatenbank |
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Ashpole, S. L. (2003). Contaminant levels and embryonic development of the snapping turtle (chelydra s. serpentina) from selected great lakes areas of concern. Unpublished thesis , University of Guelph.
Added by: Admin (29 Jan 2012 12:38:31 UTC) |
| Resource type: Thesis/Dissertation BibTeX citation key: Ashpole2003 View all bibliographic details  |
Categories: General Keywords: Chelydra, Chelydra serpentina, Chelydridae, Habitat = habitat, Nordamerika = North America, Schildkröten = turtles + tortoises, Toxikologie = toxicology, Zeitigung = incubation Creators: Ashpole Publisher: University of Guelph |
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| Abstract |
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In 1999-2000, we examined temporal and geographic variation of contaminants in snapping turtle, 'Chelydra s. serpentina', eggs and assessed biological endpoints of eggs incubated artificially. Study areas included seven sites in four Great Lakes Areas of Concern (AOC) and an inland reference site. Frequencies of egg mortality and hatchling deformity increased with specific egg contaminant loads. We also examined a single AOC site to test the effect of handling stress on embryo development by comparing eggs from undisturbed natural nests, eggs in re-buried artificial nests, and eggs artificially incubated at constant temperatures. Undisturbed nests experienced the lowest frequencies of mortality and deformity. Re-buried nests experienced significantly higher frequencies of mortality than nests incubated at constant temperatures, whereas, deformity frequencies were similar among these treatments. Results from both studies indicate that snapping turtle eggs are sensitive to contaminant exposure, and to ambient environmental variables.
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