Dissertation Research: Vocal, Morphological, and Genetic Diversification in the North American Red Crossbill (Loxia curvirostra) Complex

论文研究：北美红交嘴雀 (Loxia curvirostra) 复合体的声音、形态和遗传多样性

• 批准号: 8700999
• 负责人: Ned Johnson
• 金额: $ 1.05万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-06-01 至 1989-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8700999&HistoricalAwards=false
• 关键词: Dissertation; Research; Vocal; Morphological; Genetic

Vocal behavior is important in evolutionary processes in songbirds, yet few studies have attempted to explain morphological and genetic diversification in light of vocal information. This research will integrate vocal, morphological, and genetic data in the highly polytypic North American red crossbill (Loxia curvirostra) complex. This group presents an unsolved evolutionary paradox: the birds are nomadic, suggesting a high rate of gene flow, yet there is extreme diversity in bill size, body size, and plumage coloration within the group. Several testable alternative hypotheses regarding the nature of the variation in North American red crossbills will be tested. The hypothesis currently favored by ornithologists is that different forms of red crossbill are subspecies. This hypothesis, along with alternative hypotheses that the forms may be species, discontinuous morphs within breeding populations, or the result of developmental plasticity will also be examined. Data to be gathered include information on geographic variation in vocalizations, morphology, and allozymes, combined with information on mating behavior and breeding structure in populations.

鸣禽的发声行为在进化过程中很重要，但很少有研究试图根据发声信息来解释形态和遗传多样性。这项研究将整合高度多型性的北美红嘴鸟(Loxia Curvirostra)复合体的发声、形态和遗传数据。这一群体呈现了一个尚未解决的进化悖论：这种鸟类是游牧的，这意味着基因流动的速度很高，但该群体内的喙大小、身体大小和羽毛颜色都存在极大的多样性。关于北美红色交叉票据变异的性质的几个可测试的替代假设将被测试。目前鸟类学家支持的假设是，不同形式的红斑嘴鸟是亚种。这一假设，以及另一种形式可能是物种的假说，繁殖种群中的不连续形态，或发育可塑性的结果也将被检验。要收集的数据包括发声、形态和等位酶的地理变异信息，以及种群中交配行为和繁殖结构的信息。