Population sex ratios under differing local climates in a reptile with environmental sex determination

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• 作者：Jeanine M. Refsnider (1) (2)
  Carrie Milne-Zelman (3)
  Daniel A. Warner (4)
  Fredric J. Janzen (1)
  
• 关键词：Chrysemys picta ; Geographic variation ; Incubation ; Nest ; site choice ; Painted turtle ; Temperature ; dependent sex determination
• 刊名：Evolutionary Ecology
• 出版年：2014
• 出版时间：September 2014
• 年：2014
• 卷：28
• 期：5
• 页码：977-989
• 全文大小：305 KB
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• 作者单位：Jeanine M. Refsnider (1) (2)
  Carrie Milne-Zelman (3)
  Daniel A. Warner (4)
  Fredric J. Janzen (1)
  
  1. Department of Ecology, Evolution and Organismal Biology, Iowa State University, 251 Bessey Hall, Ames, IA, 50011-1020, USA
  2. Department of Environmental Science, Policy, and Management, University of California, Berkeley, 130 Mulford Hall, Berkeley, CA, 94720-3114, USA
  3. Department of Biology, Aurora University, 347 S. Gladstone Ave., Aurora, IL, 60506-4892, USA
  4. Department of Biology, University of Alabama at Birmingham, 464 Campbell Hall, Birmingham, AL, 35294-1170, USA
  
• ISSN：1573-8477

文摘

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.