Collaborative Research: BEST: The Trophic Role of Euphausiids in the eastern Bering Sea: Ecosystem Responses to Changing Sea-ice Conditions

合作研究：最佳：白令海东部磷虾的营养作用：生态系统对海冰条件变化的响应

• 批准号: 0732667
• 负责人: Rodger Harvey
• 金额: $ 58.35万
• 依托单位: University of Maryland Center for Environmental Sciences
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-15 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0732667&HistoricalAwards=false
• 关键词: Collaborative; Research; BEST; Trophic; Role

Harvey 0732667Univ. of Maryland Center for Environmental Sciences/CBLThe principal investigators' primary hypothesis is that seasonal and interannual variation in the timing and coverage of sea-ice and associated food resources will lead to differences in age structure, diet history and nutritional condition for euphausids, which ultimately translate into differences in production rates and availability as prey to higher trophic levels. Funds are provided to quantify the age structure and diet history of important euphausids together with detailed information on their consumption and growth and to link field collections and analysis with laboratory rearing for age calibrations and shipboard feeding experiments to test the validation and retention of trophic lipid markers as well as the quality and quantity of food resources.The investigators' objectives include:1. To determine the potential impact of climate driven changes in sea-ice conditions on lipid content and lipid classes in major euphausid species and thus nutritional condition and reproductive potential over seasonal and interannual time scales.2. To understand the feeding history, feeding rates and grazing strategies of euphausids under changing spatial (i.e. ice-covered, ice-edge, and open water zones) and temporal (i.e. seasonal and interannual) prey fields. Multiple approaches (i.e. feeding experiments, gut content analysis) will be used for validation and determination of retention of specific lipid dietary markers.3. To apply recent advances in biochemical approaches to determine the age structure in field populations of euphausids and the potential effects of climate change on maintenance or disruption of cohort populations seasonally and interannually. Laboratory rearing conducted in parallel by Alaskan colleagues will allow calibrating precise ages in cohorts.This project is part of a larger program designed to develop understanding of the integrated ecosystem of the eastern Bering Sea shelf, a highly productive region of US coastal waters. This ecosystem is home to a major portion of the commercial fisheries of the US and also provides significant resources to subsistence hunters and fisherman of Alaska. Euphausids are believed to be a critical link in the food web connecting plankton to fish resources in the region. Understanding the ecology of these organisms is critical to understanding how the commercial and subsistence fisheries may respond to a changing environment.

哈维 0732667大学。马里兰环境科学中心/CBL的主要研究人员的主要假设是，海冰和相关食物资源的时间和覆盖范围的季节性和年际变化将导致磷虾的年龄结构、饮食史和营养状况的差异，最终导致磷虾的年龄结构、饮食史和营养状况的差异。转化为生产率和可用性的差异，成为更高营养水平的猎物。提供资金来量化重要磷虾的年龄结构和饮食历史以及其消耗和生长的详细信息，并将现场收集和分析与实验室饲养进行年龄校准和船上饲养实验联系起来，以测试营养脂质标记的验证和保留以及食物资源的质量和数量。研究者的目标包括： 1．确定气候驱动的海冰条件变化对主要磷虾物种的脂质含量和脂质类别的潜在影响，从而确定季节性和年际时间尺度上的营养状况和繁殖潜力。2．了解磷虾在空间（即冰覆盖、冰缘和开阔水域）和时间（即季节性和年际）猎物场变化下的摄食历史、摄食率和放牧策略。 将使用多种方法（即喂养实验、肠道内容物分析）来验证和确定特定脂质饮食标记物的保留。3。应用生化方法的最新进展来确定磷虾野外种群的年龄结构以及气候变化对种群种群季节性和年际维持或破坏的潜在影响。阿拉斯加同事同时进行的实验室饲养将能够校准群体中的精确年龄。该项目是一个更大计划的一部分，该计划旨在加深对东白令海陆架综合生态系统的了解，白令海陆架是美国沿海水域的一个高产地区。 该生态系统是美国大部分商业渔业的所在地，也为阿拉斯加的自给猎人和渔民提供了大量资源。 磷虾被认为是连接该地区浮游生物和鱼类资源的食物网中的关键环节。 了解这些生物体的生态对于了解商业和自给渔业如何应对不断变化的环境至关重要。