Population Biology of Environmental Gender-Determination in Chrysemys picta

锦龟环境性别决定的种群生物学

• 批准号: 9629529
• 负责人: Fredric Janzen
• 金额: $ 10.08万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-10-01 至 2000-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9629529&HistoricalAwards=false
• 关键词: Population; Biology; Environmental; Gender; Determination

9629529 Janzen For most animals gender is determined by the chromosomes. In several groups of vertebrate animals gender is determined by the temperature experienced during embryonic development. This project will investigate the biology of temperature-dependent sex determination (TSD) in a natural population of the turtle Chrysemys picta. It will consider how egg size, nest-site selection, and predation affect offspring survival and sex ratio. Nesting females will be followed from year to year to study nest-site consistency. This project will help explain why some groups of animals have their gender determined by temperature rather than by chromosomes. This extends understanding of what affects fertility and sex ratio in natural populations. This project will show how habitat use and predators affect population dynamics in animals with TSD. Many such species are endangered and this information can help their conservation.

9629529 Janzen 对于大多数动物来说，性别是由染色体决定的。 在几类脊椎动物中，性别是由胚胎发育过程中经历的温度决定的。 该项目将研究 Chrysemys picta 自然种群中温度依赖性性别决定 (TSD) 的生物学。 它将考虑蛋的大小、巢穴选择和捕食如何影响后代的生存和性别比。 我们将每年对筑巢的雌性进行跟踪，以研究筑巢地点的一致性。 该项目将有助于解释为什么某些动物群体的性别是由温度而不是染色体决定的。 这扩展了对影响自然人口生育率和性别比的因素的理解。 该项目将展示栖息地的利用和捕食者如何影响患有 TSD 的动物的种群动态。 许多此类物种都濒临灭绝，这些信息可以帮助保护它们。