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

• 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

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 厄尔尼诺/南方涛动（ENSO）现象是调节太平洋气候年际变化的最重要过程。 厄尔尼诺/南方涛动循环影响海洋环流模式和气候。 在厄尔尼诺年，水向北移动的速度加快;因此，许多海洋物种的分布也向北移动。 研究人员是南卡罗来纳州大学的托马斯·J·希尔比什博士，他以前曾研究过一种海洋贻贝的分布情况，这种贻贝是本世纪早些时候引入南加州的。 自引进以来，本种已向北扩展其分布范围，并与本地种贻贝形成杂交区。 这些贻贝是北美西海岸海洋群落的重要生态组成部分，引进的物种用于加州和华盛顿的水产养殖业务。 以前的研究表明，引进种和杂交区的迁移已经停止在加州的门多西诺角。 希尔比什博士将检验一个假设，即夏季在门多西诺角周围形成的上升流阻止了进一步向北迁移，这导致贻贝幼虫向近海移动，并在那里死亡。 希尔比什博士预测，在厄尔尼诺年期间，向北的迁移将恢复，因为在这段时间内，上升流大大减少。 1997年的厄尔尼诺现象是有记录以来第二大的事件，与贻贝幼虫分散的时间一致。 因此，他预测，今年将出现引进的贻贝物种和杂交区的北移，并建议在门多西诺角周围和北部地区对贻贝幼鱼进行取样。 这项工作将检验以下假设：厄尔尼诺/南方涛动循环控制的环流模式调节包括海洋贻贝在内的近岸海洋物种的扩散和分布。 这项研究还将有助于确定引进的贻贝物种是否会继续扩张，以及哪些地区最有可能受到污染。 H:\POPBIO\ABSTRACT\HILBISH.txt