Study of Biological Response to Regime Shifts and ENSO Events in the Peruvian Humboldt Current Ecosystem

秘鲁洪堡洋流生态系统对政权转变和 ENSO 事件的生物响应研究

• 批准号: 0526392
• 负责人: Gordon Swartzman
• 金额: $ 34.92万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0526392&HistoricalAwards=false
• 关键词: Study; Biological; Response; Regime; Shifts

The principal investigator and others have suggested that there has been a strong biological response to the 1997-1998-regime shift in the California Current Ecosystem (CCE) and that analogous changes are likely in the Humboldt Current Ecosystem (HCE) off Ecuador, Peru and Chile. The PI will be collaborating with an international team of scientists familiar with the HCE to analyze available data, based primarily on acoustic survey and zooplankton and phytoplankton net data collected, regularly and intensively, by the Instituto del Mar del Peru (IMARPE) in Callao, Peru between 1983-2003 (for fish distributions from acoustics), and 1960-2003 (for zooplankton and phytoplankton net samples). The primary aim of this project is to examine the long-term pattern in distribution and abundance in the HCE of the two major pelagic fish species, Anchovy (Engraulis ringens), and Sardine (Sardinops sagax) and of the size distribution and abundance of zooplankton, and to determine their relationship to environmental factors (e.g. currents, temperature, bathymetry, eddy vorticity) and, for the fish, to their primary prey resource, zooplankton. To this end, the research team will test hypotheses concerning the spatial aggregation and overlap of these species, expected shifts in fish and zooplankton abundance and biomass distribution during warm and cold regimes (and the extreme temperature anomaly periods of El Nino and La Nina), and the relationship of anchovy stomach fullness and diet to prey availability. The broader impacts resulting from the proposed activity include providing a biological basis for management of the world's most important fisheries in upwelling systems. The collaboration and training opportunities for work in Peru fulfill a great opportunity to trade data resources for analysis capability and improved opportunity for peer publications by IMARPE scientists.

首席研究员和其他人提出，加利福尼亚洋流生态系统（CCE）对1997-1998年的制度转变产生了强烈的生物反应，厄瓜多尔、秘鲁和智利附近的洪堡洋流生态系统（HCE）也可能发生类似的变化。PI将与一个熟悉HCE的国际科学家小组合作，分析现有数据，主要基于声学调查和浮游动物和浮游植物网数据，这些数据是由秘鲁卡亚奥的秘鲁海洋研究所（IMARPE）在1983-2003年（声学鱼类分布）和1960-2003年（浮游动物和浮游植物网样本）定期和密集收集的。该项目的主要目的是研究两种主要的远洋鱼类，鳀鱼（Engraulis ringens）和沙丁鱼（Sardinops sagax）在HCE中的分布和丰度的长期模式，以及浮游动物的大小分布和丰度，并确定它们与环境因素（例如洋流、温度、水深、涡度）的关系，以及鱼类与其主要猎物资源浮游动物的关系。为此，研究小组将测试关于这些物种的空间聚集和重叠的假设，在温暖和寒冷的情况下（以及厄尔尼诺和拉尼娜的极端温度异常时期），鱼类和浮游动物丰度和生物量分布的预期变化，以及凤尾鱼胃饱腹度和饮食与猎物可用性的关系。拟议的活动所产生的更广泛的影响包括为管理上升流系统中世界上最重要的渔业提供生物学基础。在秘鲁工作的合作和培训机会提供了一个很好的机会，可以用数据资源交换分析能力，并改善IMARPE科学家发表同行论文的机会。