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.

对大多数动物来说，性别是由染色体决定的。在一些脊椎动物群体中，性别是由胚胎发育过程中所经历的温度决定的。本项目将研究龟龟自然种群温度依赖性性别决定（TSD）的生物学特性。它将考虑蛋的大小、筑巢地点的选择和捕食如何影响后代的生存和性别比例。将对筑巢的雌性进行年复一年的跟踪，以研究筑巢地点的一致性。这个项目将有助于解释为什么一些动物的性别是由温度而不是由染色体决定的。这扩大了对自然种群中影响生育率和性别比的因素的理解。该项目将展示栖息地利用和捕食者如何影响TSD动物的种群动态。许多这类物种濒临灭绝，这些信息可以帮助保护它们。