Literaturdatenbank
Literaturdatenbank |
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Rhen, T., & Lang, J. W. (1998). Among-family variation for environmental sex determination in reptiles. Evolution, 52(5), 1514–1520.
Added by: Admin (14 Aug 2008 22:46:53 UTC) |
| Resource type: Journal Article BibTeX citation key: Rhen1998 View all bibliographic details  |
Categories: General Keywords: Chelydra, Chelydra serpentina, Chelydridae, Chrysemys, Chrysemys picta, Emydidae, Panzerechsen = crocodilia, Schildkröten = turtles + tortoises, Zeitigung = incubation Creators: Lang, Rhen Collection: Evolution |
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| Abstract |
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Unlike birds and mammals, in many reptiles the temperature experienced by a developing embryo determines its gonadal sex. To understand how temperature-dependent sex determination (TSD) evolves, we must first determine the nature of genetic variation for sex ratio. Here, we analyze among-family variation for sex ratio in three TSD species: the American alligator (Alligator mississipiensis), the common snapping turtle (Chelydra serpentina), and the painted turtle (Chrysemys picta). Significant family effects and significant temperature effects were detected in all three species. In addition, family-by-temperature interactions were evident in the alligator and the snapping turtle, but not in the painted turtle. Overall, the among-family variation detected in this study indicates potential for sex-ratio evolution in at least three reptiles with TSD. Consequently, climate change scenarios that are posited on the presumption that sex-ratio evolution in TSD reptiles is genetically constrained may require reevaluation
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