The Geographic Scale of Larval Dispersal

幼虫传播的地理范围

基本信息

批准号：
9731277
负责人：
Thomas Hilbish
金额：
$ 11.24万
依托单位：
University of South Carolina at Columbia
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1998
资助国家：
美国
起止时间：
1998-04-01 至 2002-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9731277&HistoricalAwards=false
关键词：
Geographic Scale Larval Dispersal

项目摘要

Patterns of larval movement and the spatial scale of dispersal are expected to be major forces in regulating the dynamics of populations and communities in marine systems. The life history of most marine species includes a larval stage that is capable of dispersal over broad geographic areas and efforts to understand the population dynamics of these species have been stymied by the magnitude of larval dispersal inherent in planktotrophic development. The scale of larval dispersal is a key parameter in understanding the recruitment dynamics of marine species. We will exploit the genetic mosaics formed in a hybrid zone between two species of mussels to assess the geographic scale of larval dispersal. In this system, large numbers of larvae are produced at specific locations with distinct genetic signatures and released into the plankton. By monitoring the settlement of these `marked` larvae we will assess the geographic scale and dynamics of larval dispersal. In this study we will capitalize on molecular genetic markers, that we have developed with previous support from Biological Oceanography, that allow the population genetics of mussel larvae or spat to be determined. By exploiting both the molecular genetic markers we have developed, and the presence of genetic mosaics formed by hybridization between mussel species it will be possible to monitor the movement of larvae between geographic areas. Using this system we will determine the geographic scale of larval dispersal, spatial and temporal variation in dispersal capacity and test the hypothesis that patterns of larval movement are predominantly controlled by local circulation dynamics.

幼虫运动的模式和分散的空间尺度预计将是调节海洋系统中人口和社区动态的主要力量。大多数海洋物种的生活历史包括一个能够在广阔的地理区域扩散的幼虫阶段，以及了解这些物种的种群动态的努力受到浮游营养发展固有的幼虫分散体的幅度所阻碍。幼虫分散的尺度是理解海洋物种募集动力学的关键参数。我们将利用在两种贻贝之间在杂种区中形成的遗传镶嵌物来评估幼虫分散的地理量表。在该系统中，在特定位置产生了大量幼虫，并具有不同的遗传特征，并释放到浮游生物中。通过监视这些标记的幼虫的沉降，我们将评估幼虫分散的地理规模和动态。在这项研究中，我们将利用分子遗传标记，这些标志物在生物海洋学的先前支持下开发，从而确定贻贝幼虫或吐痰的种群遗传学。通过利用我们开发的两个分子遗传标记，以及贻贝物种之间杂交形成的遗传镶嵌物的存在，可以监测地理区域之间幼虫的运动。使用该系统，我们将确定分散能力的幼虫分散，空间和时间变化的地理量表，并检验以下假设：幼虫运动模式主要由局部循环动力学控制。