Literaturdatenbank
Literaturdatenbank |
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Shelby, J. A., & Mendonça, M. T. (2001). Comparison of reproductive parameters in male yellow-blotched map turtles (graptemys flavimaculata) from a historically contaminated site and a reference site. Comparative Biochemistry and Physiology Part C: Toxicology & Pharmacology, 129(3), 233–242.
Added by: Admin (17 Aug 2008 17:24:00 UTC) |
| Resource type: Journal Article BibTeX citation key: Shelby2001 View all bibliographic details  |
Categories: General Keywords: Emydidae, Graptemys, Graptemys flavimaculata, Schildkröten = turtles + tortoises, Toxikologie = toxicology, Zeitigung = incubation Creators: Mendonça, Shelby Collection: Comparative Biochemistry and Physiology Part C: Toxicology & Pharmacology |
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| Abstract |
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Graptemys flavimaculata From May to September of 1998, we collected monthly plasma samples from male yellow-blotched map turtles captured at two sites in the Pascagoula River drainage, Mississippi. One site (Vancleave) has a documented history of pollution from industrial sources (principally 2,3,7,8-tetrachlorodibenzo-p-dioxin, TCDD). Fish consumption advisories at the Vancleave site were lifted in 1996 and current impacts appear minimal. However, the yellow-blotched map turtle, a federally protected species, continues to decline in numbers. To determine if endocrine disruption could be a factor in the low reproductive rates observed in Vancleave turtles, we examined levels of plasma testosterone (T) and estradiol-17beta (E(2)) from males at this site and a second site (Leaksville), which has no known source of industrial pollution. Plasma was also tested for vitellogenin (VTG), which, in males, can be a biomarker of exposure to estrogenic contaminants. No males had detectable plasma VTG nor did mean monthly E(2) levels differ between sites. However, 10% of males from the historically polluted site were found to have high levels of E(2) (equivalent to levels found in females) and T was significantly lower for males captured at this site for 3 of 5 months. Our data suggest that the current impact of contaminants on reproduction in this population is limited. However, a portion of the population may have been affected developmentally, as represented by differences in reproductive parameters detected between sites.
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