COLLABORATIVE RESEARCH: What Controls the Transfer of Diatom Organic Matter to age-0 Pollock Prey in the Bering Sea Ecosystem?

合作研究：是什么控制着白令海生态系统中硅藻有机物向 0 岁狭鳕猎物的转移？

• 批准号: 1603460
• 负责人: Michael Lomas
• 金额: $ 10.9万
• 依托单位: Bigelow Laboratory for Ocean Sciences
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-11-01 至 2019-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1603460&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; What; Controls; Transfer

The highly productive and economically important Walleye Pollock commercial fishery of the Bering Sea depends on poorly understood food web pathways. Primary producers of organic carbon, notably diatoms, are consumed by large crustacean zooplankton, which, in turn, are consumed by juvenile pollock. The dominant paradigm for the system suggests that understanding changes in the biomass of large crustacean zooplankton can help estimate the survival of juvenile pollock; however, recent data show two orders of magnitude uncertainty in the carbon demand of large crustacean zooplankton. Such uncertainties impact the ability to manage the fishery. A revised model for the system has been proposed that involves consideration of both the quantity and quality of organic matter produced by diatoms and how this would constrain support for the commercial fishery. Before investing in a major field effort to test this approach, this project will assess the expected magnitude of change and associated errors, for diatom organic matter production, including the individual terms that are used to estimate it, i.e. abundance, growth rate, and cell carbon. This effort will be based on laboratory experiments and historical data analysis. The project will contribute to STEM workforce development through partial support for the training of a post-doctoral associate. Undergraduates would be entrained into the science through an REU program at Bigelow Laboratory for Ocean Sciences and through the Colby College Semester at Bigelow program. K-12 outreach will be facilitated through participation in the successful and long-standing Dauphin Island Sea Lab Discovery Hall program. Outreach to the general public will be accomplished through a blog, Bigelow?s Café Scientifique, and the Bigelow newsletter. The long-term goal for the research that this project would initiate is improved mechanistic and predictive models for commercial fisheries management.There is no consensus on the mechanistic relationship of where carbon from the lower trophic levels goes in the Bering Sea ecosystem, hence simple proportionality relationships between primary production and fisheries are used routinely. Bottom-up control on age-0 walleye pollock prey, i.e. large crustacean zooplankton (LCZ), could help constrain this coupling between the primary producers and pollock fishery, but there is a two-order-of-magnitude uncertainty in the LCZ carbon demand based on estimates from the Bering Sea Ecosystem Study (BEST). A new conceptual model is required and this project will begin to refine the issue by focusing on diatoms, which have a less patchy distribution than LCZ and are a key prey item of LCZ. A major knowledge gap exists in the understanding of the magnitude of diatom loss processes; the logical next step to understanding the fundamental linkage between primary production and fisheries in the eastern Bering Sea is to answer: what is the proportion of diatom primary production available for supporting higher trophic organisms and with which biogeochemical variables does this covary? Before testing this approach in a field setting, the expected magnitude of change and associated error for diatom organic matter production, including the individual terms that go into that estimate (i.e. abundance, growth rate, cell carbon), must be understood. This project will combine culture studies using diatoms isolated from high-latitude regions with literature and BEST program data to meet this initial objective.

高度的Polleye Polleye Poling Sea取决于有机碳的Rimary Food Brouner。大型的Zoplankton可以帮助估计大型甲壳动物的碳需求中的两个命令投资于测试这种方法的主要努力，该项目将评估变更和相关错误的期望，用于硅藻有机物生产，用于估计它的术语，即丰度，增长率和细胞碳将根据实验和历史数据分析。公众将通过博客，Bigelow来完成，而Bigelow通讯和Bigelow新闻通讯。在白令海洋生态系统中，通常使用初级生产和渔业之间的关系。 SEA生态系统研究（最佳）项目将通过关注硅藻的发行，而硅藻的分布不如LCZ，并且是LCZ的Akey项目。海洋要回答：在这种方法中，可用于支撑助力的生物的硅藻原生生产的比例该估计的术语（即丰度，生长速率，细胞碳）必须与培养基研究相结合的培养研究，并使用硅藻隔离的高层间区域与文献和最佳程序数据，以满足这一初始目标。