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: 0732382
• 负责人: Carin Ashjian
• 金额: $ 55.93万
• 依托单位: Woods Hole Oceanographic Institution
• 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=0732382&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俄勒冈州立大学提供资金用于分析海冰条件变化对浮游食物网结构的影响，重点关注微型浮游动物和中型浮游动物的营养联系以及春季海冰条件下白令海浮游植物大量繁殖的命运。为此，主要研究人员计划在一系列冰、冰边缘和开放水域条件下进行实验，特别是考虑分离冰藻（如果存在）作为二次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常备生物量、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物种的放牧率和猎物偏好。他们还将确定浮游生物的精细尺度垂直分布，特别是脆弱形式的浮游植物，例如群落浮游植物，以识别与水文特征相关的浮游生物/颗粒的薄层。他们的合作研究将明确解决亚北极该地区以前未探索过的营养联系。他们假设由于全球变暖而改变生态系统结构，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 BEST 实地计划期间针对春季海冰条件提出的三次年度巡航。他们将在 BEST 研究区域内沿横断面的指定站点进行全套分析（库存测定和速率测量）。将结合丰度和速率测量来确定相对的微型浮游动物和中型浮游动物放牧影响。虽然从该计划中获得的直接测量和观察将使主要研究人员能够以迄今为止无法获得的详细信息描述白令海陆架东部的微型浮游动物和中型浮游动物及其放牧影响，但他们得出的数字也将为作为 BEST 一部分开发的生态系统模型提供强有力的约束。 这些模型将成为综合最佳研究人员集体理解的重要工具。