Biophysical and Behavioral Agents of Natural Selection in a Hybrid Zone

混合区自然选择的生物物理和行为因素

基本信息

批准号：
0131308
负责人：
Thomas Hilbish
金额：
$ 22万
依托单位：
University South Carolina Research Foundation
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2002
资助国家：
美国
起止时间：
2002-04-01 至 2005-03-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0131308&HistoricalAwards=false
关键词：
Biophysical Behavioral Agents Natural Selection

项目摘要

The structure of hybrid zones depends on the interaction of natural selection and dispersal. Simple models using different forms of natural selection have been generated to explain the structure and maintenance of hybrid zones. However, field studies have shown that natural selection can be very complex and that an understanding of hybrid zones cannot be obtained through simple models. It is necessary to determine the agent of natural selection and the ecological circumstances under which it operates to understand how hybrid zones are formed and maintained. This study proposes to determine the selective forces operating in a hybrid zone formed between two species of marine mussels. Results from a previous grant demonstrated that the two species differed in their physiological capacity to tolerate elevated silt. One possible adaptation to elevated silt is increased mobility so that the animal can move and avoid smothering. This adaptation may be detrimental in open coast environments where silt concentrations are low and mussels may be dislodged by exposure to increased wave action. Mussels that are more mobile may be exposed to greater wave action if they migrate to the top of mussel beds or into other locations where they are more likely to be dislodged. This study will test the hypothesis that these two species of mussels differ in their behavioral adaptations to silt and that these differences result in strong natural selection against the more mobile species in open coast environments.

杂交区的结构取决于自然选择和分散的相互作用。已经生成了使用不同形式的自然选择的简单模型来解释混合区域的结构和维护。但是，现场研究表明，自然选择可能非常复杂，并且无法通过简单模型获得对杂种区域的理解。有必要确定自然选择的推动者以及其操作的生态环境，以了解如何形成和维护混合区。这项研究建议确定在两种海洋贻贝之间形成的杂种区中运行的选择性力。先前赠款的结果表明，这两个物种的生理能力有所不同，可以耐受淤泥升高。一种可能适应提高淤泥的可能是提高迁移率，因此动物可以移动并避免窒息。这种适应可能在淤泥浓度较低的开放沿海环境中有害，贻贝可能会因暴露于海浪作用而消失。如果贻贝迁移到贻贝床的顶部或其他可能会被驱逐的位置，则可能会暴露于更大的波动作用。这项研究将检验以下假设：这两种贻贝在其行为适应淤泥方面有所不同，这些差异导致在开放沿海环境中针对更多流动物种的自然选择。