Dissertation Research: An Examination of Variations on the Theme of Livebearing

论文研究：对生命主题变化的考察

• 批准号: 0710185
• 负责人: David Reznick
• 金额: $ 1.14万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-06-15 至 2010-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0710185&HistoricalAwards=false
• 关键词: Dissertation; Research; Examination; Variations; Theme

The fish family Poeciliidae includes one species that lays eggs and approximately 200 that bear live young. The livebearers include many species with placentas, a trait commonly thought to exist only in mammals. Placental reproduction is a type of matrotrophy (mother feeding), or post-fertilization maternal provisioning. It has evolved multiple times in a diversity of organisms. Despite its many origins and apparent importance as a life history trait, there is no explanation for what shaped its evolution. The diversity in the Poeciliidae facilitates the study of factors that shape different modes of maternal provisioning. The proposed research includes laboratory, field, and data-mining techniques to examine several hypotheses for the evolution of matrotrophy and reproductive allocation. This work represents the first experimental test of predictions derived from the only theoretical model for the evolution of matrotrophy, examines several ad-hoc hypotheses, and has the potential to generate new, testable, hypotheses. It will facilitate broader studies on the evolution of matrotrophy. It includes collaborations with the theoreticians that developed this model, so that empirical research can inform and modify the current model and make it more biologically realistic. Numerous undergraduates will participate in this research.

鱼科包括一种产卵的鱼和大约200种生下活仔的鱼。 活产动物包括许多具有胎盘的物种，这种特征通常被认为只存在于哺乳动物中。 胎盘繁殖是一种母养型（母亲喂养），或受精后母亲提供。 它在多种生物体中进化了多次。 尽管它有许多起源和明显的重要性，作为一个生活史特征，没有解释是什么塑造了它的进化。 Poeciliidae的多样性有利于研究形成不同模式的孕产妇供应的因素。 拟议的研究包括实验室，现场和数据挖掘技术，以检查几个假设的营养和生殖分配的演变。这项工作代表了第一个实验测试的预测来自唯一的理论模型的进化的营养，检查几个特设的假设，并有可能产生新的，可检验的，假设。 这将有助于更广泛地研究营养型的进化。它包括与开发该模型的理论家合作，以便实证研究可以为当前模型提供信息和修改，使其更具生物现实性。 许多大学生将参与这项研究。