Literaturdatenbank
Literaturdatenbank |
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Steen, D. A., & Gibbs, J. A. (2004). Effects of roads on the structure of freshwater turtle populations. Conservation Biology, 18(4), 1143–1148.
Added by: Admin (14 Aug 2008 20:37:24 UTC) |
| Resource type: Journal Article BibTeX citation key: Steen2004 View all bibliographic details  |
Categories: General Keywords: Chelydra, Chelydra serpentina, Chelydridae, Chrysemys, Chrysemys picta, Emydidae, Habitat = habitat, Nordamerika = North America, Schildkröten = turtles + tortoises Creators: Gibbs, Steen Collection: Conservation Biology |
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| Abstract |
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Abstract: Road mortality has the potential to alter the structure of turtle populations because turtle populations are highly sensitive to additive sources of adult mortality. To address the issue, we captured painted turtles ( Chrysemys picta; n = 174) and snapping turtles ( Chelydra serpentina; n = 56) in 18 wetlands surrounded by low road density (1.5 km roads/km2 of landscape) and 17 wetlands surrounded by high road density (>1.5 km/km2) in central New York in 2002. High road density was associated with male-biased sex ratios in painted turtles (74% vs. 54% males; p = 0.01) and snapping turtles (95% vs. 74% males; p = 0.08), whereas turtle morphology and abundance were not associated with road density. Disproportionate road mortality of females on nesting migrations is the most likely cause of skewed sex ratios.
Added by: Admin |