GLOBEC 2000: Spatial and Temporal Variability of Microplankton in the Gulf of Alaska

GLOBEC 2000：阿拉斯加湾微型浮游生物的时空变化

• 批准号: 0107769
• 负责人: Evelyn Lessard
• 金额: $ 60.54万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-02-15 至 2007-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0107769&HistoricalAwards=false
• 关键词: GLOBEC; 2000; Spatial; Temporal; Variability

The focus of this project is to describe quantitatively the abundance, biomass and size-structure of the microplankton (phytoplankton and microzooplankton 200 um) prey fields as part of the Gulf of Alaska GLOBEC program. A central objective of the mesoscale studies is to determine how physical forcing affects the availability and production of zooplankton prey for juvenile pink salmon. Juvenile salmon prey (copepods, euphausiids, pteropods, amphipods) depend directly or indirectly on diverse mircroplanktonic prey, including microzooplankton (flagellates and ciliates) which have recently been recognized to be a significant dietary component of zooplankton. The size-structure, taxonomic composition and growth dynamics of the lower trophic food web are expected to be highly responsive to physical forcing and, in turn, exert strong influences on zooplankton growth, fecundity, community composition and nutritional state. Group-specific phytoplankton growth and microzooplankton grazing rates will also be measured to identify trophic pathways and responses to changing physical regimes. This study will provide critical mechanistic insight and validation for coupled biological-physical models of the Gulf of Alaska shelf ecosystem.

作为阿拉斯加湾 GLOBEC 计划的一部分，该项目的重点是定量描述微型浮游生物（浮游植物和微型浮游动物 200 um）猎物场的丰度、生物量和大小结构。 中尺度研究的一个中心目标是确定物理强迫如何影响幼年粉红鲑鱼浮游动物猎物的可用性和生产。 幼年鲑鱼的猎物（桡足类、磷虾科、翼足类、片足类）直接或间接依赖于多种微型浮游动物猎物，包括微型浮游动物（鞭毛虫和纤毛虫），它们最近被认为是浮游动物的重要饮食成分。 低营养级食物网的大小结构、分类组成和生长动态预计将对物理强迫高度敏感，进而对浮游动物的生长、繁殖力、群落组成和营养状态产生强烈影响。 还将测量特定群体的浮游植物生长和微型浮游动物的放牧率，以确定营养途径和对不断变化的物理状况的反应。 这项研究将为阿拉斯加湾陆架生态系统的生物物理耦合模型提供关键的机制见解和验证。