Literaturdatenbank
Literaturdatenbank |
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Refsnider, J. M., Milne-Zelman, C., Warner, D. A., & Janzen, F. J. (2014). Population sex ratios under differing local climates in a reptile with environmental sex determination. Evolutionary Ecology, (early view).
Added by: Sarina Wunderlich (06 Jul 2014 16:17:16 UTC) |
| Resource type: Journal Article DOI: 10.1007/s10682-014-9710-2 BibTeX citation key: Refsnider2014 View all bibliographic details  |
Categories: General Keywords: Emydidae, Habitat - habitat, Nordamerika - North America, Schildkröten - turtles + tortoises, Terrapene ornata, Zeitigung - incubation Creators: Janzen, Milne-Zelman, Refsnider, Warner Collection: Evolutionary Ecology |
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| Abstract |
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Populations that experience different local climates, such as those along a latitudinal gradient, must match life history traits to local environmental conditions. In species with temperature-dependent sex determination, such as many reptiles, population sex ratio is strongly influenced by local climate, yet local climate differs substantially among populations in geographically-widespread species. We studied the painted turtle at three sites across the species’ geographic range to gain a mechanistic understanding of how sex ratios are produced under different local climates. We combined data on maternal nest-site choice, nest incubation temperature, and the resultant offspring sex ratio of populations across a climatic gradient, to demonstrate how geographic variation in behavior and physiology translates into sex ratios among populations of a widely-distributed species. We found that populations across the species’ geographic range match incubation conditions with local climatic conditions through population-specific adjustment of maternal nest-site choice. Incubation temperatures during the thermosensitive period were cooler and clutches were more male-biased in the south, with populations farther north having warmer incubation temperatures and more female-biased sex ratios, yet adult sex ratios were not strongly biased in any population. Most components of maternal nest-site choice varied latitudinally among populations, suggesting that the species may have a considerable repertoire for responding to climate change through adjustment of nest-site choice.
Added by: Sarina Wunderlich |