LTREB: Long-term Studies of Demography and Social Behavior in a Colonial Bird

LTREB：殖民地鸟类人口统计学和社会行为的长期研究

• 批准号: 0075199
• 负责人: Charles Brown
• 金额: $ 26.14万
• 依托单位: University of Tulsa
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-02-01 至 2007-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0075199&HistoricalAwards=false
• 关键词: LTREB; Long; term; Studies; Demography

0075199BrownThis proposal seeks support for years 20-24 of a long-term study of demography and social behavior of cliff swallows in southwestern Nebraska. The investigators will continue to monitor survival, dispersal, and colony choice for a population of marked birds that now numbers 110,286 individuals. These data will be applied to other ongoing investigations of swallow population biology that will incorporate study of the effect of group size, and will also be used to study the long-term demographic consequences of a rare climatic event that occurred in the study area in 1996. Severe weather of this timing and magnitude has occurred in southwestern Nebraska only twice inn the last 125 years, and it reduced the population of cliff swallows by over 50%. By applying the same methods and colony sampling schemes developed and used since 1982, this study will provide direct comparisons among years during a period spanning over two decades. Data gathered will be applied to work on (1) morphological evolution - directional selection on body size and selection for low levels of bilateral asymmetry brought about by the rare climatic event; (2) the relationship between colony size, steroid hormone levels, and immunocompetence - how levels of testosterone and corticosterone at different times during the breeding season vary with colony size; (3) transmission dynamics of ectoparasites and their associated alphaviruses; and (4) variation in colony size.

0075199布朗的建议寻求支持20-24年的人口统计学和内布拉斯加州西南部的悬崖燕子的社会行为的长期研究。研究人员将继续监测一个有标记的鸟类种群的生存、扩散和群体选择，这个种群现在有110,286只。这些数据将被应用到其他正在进行的调查，燕子种群生物学，将纳入研究组大小的影响，也将被用来研究一个罕见的气候事件发生在1996年的研究领域的长期人口后果。在过去的125年里，内布拉斯加州西南部只发生过两次这种时间和强度的恶劣天气，使悬崖燕子的数量减少了50%以上。通过应用自1982年以来开发和使用的相同方法和群体抽样方案，本研究将提供跨越20多年的期间内各年之间的直接比较。收集到的数据将用于研究（1）形态进化-对体型大小的定向选择和对罕见气候事件造成的低水平双侧不对称的选择;（2）群体大小、类固醇激素水平和免疫能力之间的关系-在繁殖季节的不同时间睾酮和皮质酮水平如何随群体大小变化;（3）体外寄生虫及其相关甲病毒的传播动力学;（4）菌落大小的变化。