SGER: Migration of a Hybrid Zone in Response to the 1997 El Nino Event

SGER：响应 1997 年厄尔尼诺事件的混合区迁移

基本信息

批准号：
9807055
负责人：
Thomas Hilbish
金额：
$ 2.19万
依托单位：
University of South Carolina at Columbia
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1998
资助国家：
美国
起止时间：
1998-02-15 至 2000-01-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9807055&HistoricalAwards=false
关键词：
SGER Migration Hybrid Zone Response

项目摘要

Hilbish 9807055 The El Ni o/Southern Oscillation (ENSO) phenomenon is the most important process regulating year-to-year climate variation in the Pacific. The ENSO cycle affects patterns of ocean circulation as well as climate. During an El Ni o year there is an increased movement of water northward; consequently there is northward shift in the distribution of many marine species. The investigator, Dr. Thomas J. Hilbish of the University of South Carolina, has previously examined the distribution of a marine mussel that was introduced to Southern California earlier this century. Since its introduction this species has expanded its range northward and formed a hybrid zone with a native species of mussel. These mussels are important ecological constituents of marine communities on the west coast of North America and the introduced species is used in aquaculture operations in California and Washington. Previous studies indicate that the migration of the introduced species and the hybrid zone has stopped at Cape Mendocino, California. Dr. Hilbish will test the hypothesis that further migration northward has been prevented by upwelling that forms during the summer around Cape Mendocino, which causes the movement of mussel larvae offshore, where they die. Dr. Hilbish has predicted that migration northward would resume during an El Ni o year because upwelling is greatly reduced during this time. The 1997 El Ni o event is the second largest ever recorded and coincides with the period of time that mussel larvae are dispersed. Therefore he predicts that the northward movement of the introduced mussel species and the hybrid zone will occur this year and proposes to sample mussel juveniles as they recruit in the area around and north of Cape Mendocino. This work will test the hypothesis that circulation patterns controlled by the ENSO cycle regulate the dispersal and distribution of near-shore marine species, including marine mussels. This study will also help determine whether the expan sion of the introduced mussel species will continue and which regions are most likely to become contaminated. H:\POPBIO\ABSTRACT\HILBISH.txt

Hilbish 9807055 El Ni O/Southern振荡（ENSO）现象是调节太平洋年度气候变化的最重要过程。 ENSO循环会影响海洋循环的模式以及气候。在埃尔尼（El ni o）的一年中，北方的水流动增加。因此，许多海洋物种的分布北部发生了变化。调查员，南卡罗来纳大学的托马斯·J·希尔比什（Thomas J. Hilbish）博士此前曾研究过本世纪初向南加州介绍的海洋贻贝的分布。自从引入以来，该物种向北扩展了范围，并与本地贻贝形成了一个混合区。这些贻贝是北美西海岸海洋社区的重要生态成分，而引入的物种用于加利福尼亚和华盛顿的水产养殖业务。先前的研究表明，引进的物种和混合区的迁移已在加利福尼亚州的门多西诺角停止。希尔比什（Hilbish）博士将检验以下假设：在夏季夏季，夏季围绕夏季形成的上升流动，这会导致贻贝幼虫在海上死亡。希尔比什（Hilbish）博士预测，北部迁移将在一年中恢复，因为在这段时间里上升大大减少。 1997年的El Ni O事件是有史以来第二大事件，与贻贝幼虫分散的时间相吻合。因此，他预测，引入的贻贝物种的北向运动和混合区将在今年发生，并提议在门多西诺角（Cape Mendocino）周围和北部招募贻贝少年时进行采样。这项工作将检验以下假设：ENSO周期控制的循环模式调节包括海洋贻贝在内的近岸海洋物种的分散和分布。这项研究还将有助于确定引入的贻贝物种的扩展是否会继续以及最有可能受到污染的区域。 h：\ popbio \摘要\ hilbish.txt