Collaborative Research: BEST: Mesozooplankton-microbial food web interactions in a climatically changing sea ice environment

合作研究：最佳：气候变化的海冰环境中浮游动物与微生物食物网的相互作用

• 批准号: 0732301
• 负责人: Evelyn Sherr
• 金额: $ 78.5万
• 依托单位: Oregon State University
• 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 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0732301&HistoricalAwards=false
• 关键词: Collaborative; Research; BEST; Mesozooplankton; microbial

Sherr 0732301Oregon State UniversityFunds are provided for an analysis of the impact of changing sea ice conditions on planktonic food web structure, focusing on microzooplankton and mesozooplankton trophic linkages and the fate of phytoplankton blooms in the Bering Sea during spring sea ice conditions. To this end, the principal investigators plan to conduct experiments over a range of ice, ice edge, and open water conditions, and, particularly, will consider the importance of detached ice algae, when present, as a food source for the secondary consumers. As part of this effort, they will determine standing stock biomass, composition, and size structures of phytoplankton, microzooplankton and mesozooplankton assemblages, measure microzooplankton growth and mesozooplankton reproduction rates, and measure grazing rates and prey preferences of heterotrophic protists and dominant species of mesozooplankton. They will also determine the fine scale vertical distribution of plankton, especially of fragile forms such as colonial phytoplankton, to identify thin layers of plankton/ particles in association with hydrographic features. Their collaborative study will explicitly address trophic linkages previously unexplored in this region of the subarctic. They hypothesize that changing ecosystem structure due to global warming, e.g. decrease in seasonal sea ice, will alter these trophic interactions, and thus the ultimate fates of algal production in this region. They plan to participate in each of the three annual cruises proposed for spring sea-ice conditions during the BEST field program. They will carry out a full set of analyses (standing stock determinations and rate measurements) at designated stations along transects within the BEST study area. Abundances and rate measures will be combined to determine relative microzooplankton and mesozooplankton grazing impacts. While the direct measurements and observations to be derived from this program will allow the principal investigators to describe the microzooplankton and mesozooplankton of the eastern Bering Sea shelf and their grazing impacts with a detail heretofore unavailable, the numbers they derive will also provide strong constraints on the ecosystem models to be developed as part of BEST. These models will serve as an important tool during the synthesis of the collective understanding derived by the BEST investigators.

Sherr 0732301 Oregon State UniversityFunds被提供用于分析海冰条件变化对浮游生物食物网结构的影响，重点是微型浮游动物和中型浮游动物营养联系以及春季海冰条件下白令海浮游植物水华的命运。为此，主要研究人员计划在一系列冰、冰缘和开放水域条件下进行实验，特别是将考虑分离的冰藻作为二级消费者食物来源的重要性。作为这项工作的一部分，他们将确定浮游植物、微型浮游动物和中型浮游动物组合的现存生物量、组成和大小结构，测量微型浮游动物的生长和中型浮游动物的繁殖率，并测量异养原生生物和中型浮游动物优势种的摄食率和猎物偏好。他们还将确定浮游生物的细尺度垂直分布，特别是群体浮游植物等脆弱形式，以确定与水文特征相关的浮游生物/颗粒薄层。他们的合作研究将明确解决以前在亚北极地区未探索的营养联系。他们假设，由于全球变暖而改变的生态系统结构，例如季节性海冰的减少，将改变这些营养相互作用，从而改变该地区藻类生产的最终命运。他们计划参加在最佳实地项目期间针对春季海冰条件提出的三次年度巡航中的每一次。他们将在BEST研究区内沿沿着指定的站点进行一整套分析（现存量测定和比率测量）。丰度和速率措施将结合起来，以确定相对的微型浮游动物和中型浮游动物放牧的影响。虽然直接测量和观察来自这个程序将允许主要研究人员描述的微型浮游动物和中型浮游动物的东白令海大陆架和他们的放牧影响的细节迄今为止无法获得，他们得出的数字也将提供强大的约束生态系统模型开发的一部分最佳。 这些模型将作为一个重要的工具，在综合的集体理解所得出的最佳研究。