SGER: Impact of Severe ENSO Events on Insular Endemic Shorefish Populations

SGER：严重 ENSO 事件对岛屿特有滨鱼种群的影响

• 批准号: 9729390
• 负责人: Gerard Wellington
• 金额: $ 1.96万
• 依托单位: University of Houston
• 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: 1998-01-01 至 1999-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9729390&HistoricalAwards=false
• 关键词: SGER; Impact; Severe; ENSO; Events

Recent meteorological predictions indicate that a severe El Nino/Southern Oscillation will develop during that latter part of 1997 and extend through 1998. This ENSO event is predicted to be comparable or more intense than the 1982/83 event the strongest ENSO recorded in this century. This SGER study will gather baseline data for investigating the effects of this ENSO on recruitment and population dynamics of reef fish populations in the Galapagos Islands. Of particular interest is the effects of hybridization and introgression observed between invading mainland species and island endemics that resulted from the 1982/83 ENSO. Recent work has found evidence to indicate that extensive recruitment of the mainland damselfish species, Stegastes acapulcoensis in Galapagos occurred during 1982 83. Currently extant populations of S. acapulcoensis coexist in Galapagos alongside the island endemic, Stegastes arcilrons. Otolith analyses of adult fish indicate that the first cohort of these adults arrived in 1983. The population has subsequently grown, presumably from local recruitment. In addition, a significant proportion of hybrids have been detected by electrophoretic protein analyses. Dr. Wellington predicts that another invasion will occur in early to mid 1998. He add associates will document the distribution and intensity of recruitment of S. acapulcoensis in the Galapagos Archipelago. These data will provide invaluable information needed to predict potential effects of climate change on insular marine organisms.

最近气象预测显示，1997年下半年将出现严重的厄尔尼诺/南方涛动，并将持续到1998年。据预测，这次ENSO事件与1982/83年的事件相当或更强烈 这是本世纪有记录以来最强的ENSO现象。这项SGER研究将收集基线数据，以调查厄尔尼诺/南方涛动对加拉帕戈斯群岛珊瑚礁鱼类种群的补充和种群动态的影响。特别令人感兴趣的是杂交和渗入之间观察到的入侵大陆物种和岛屿特有的，导致1982/83年厄尔尼诺/南方涛动的影响。最近的工作已经发现的证据表明，广泛的招聘大陆雀鲷物种，Stegastes acquincoensis在加拉帕戈斯群岛加拉帕戈斯发生在1982 - 83。现存的S.在加拉帕戈斯，与岛上特有的黑冠雀（Stegastes arcilrons）共存。对成鱼的耳石分析表明，第一批成鱼于1983年抵达。后来人口增加，大概是从当地招募的。此外，通过蛋白质电泳分析检测到了相当大比例的杂交种。惠灵顿博士预测，另一次入侵将在1998年初至年中发生。他补充说，助手们将记录S的分布和招募强度。产于加拉帕戈斯群岛的阿肯科龙。这些数据将为预测气候变化对岛屿海洋生物的潜在影响提供宝贵的信息。