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 0732301OREGON州立大学提供了分析，分析了改变海冰条件对浮游食品网络结构的影响，重点关注Microzooplankton和Mesozooplankton Trophic Rickages以及在春季海冰条件期间Bering Sea在Bering Sea中浮游植物的命运。为此，主要研究人员计划在一系列冰，冰边和开放水上条件上进行实验，尤其是在存在的情况下，将考虑脱离的冰藻的重要性，作为中级消费者的食物来源。作为这项努力的一部分，他们将确定植物生物量，组成和大小结构的大小结构，Microzooplankton和Mesozooplankton组合，测量Microzooplankton的增长和中佐普兰克顿再生产速率，并衡量杂种蛋白质质和替代品的偏好率和偏好。他们还将确定浮游生物的细小垂直分布，尤其是脆弱形式（例如殖民浮游植物），以鉴定浮游生物/颗粒与水文特征相关的薄层。他们的协作研究将明确解决以前在亚北极地区该地区未探索的营养联系。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的相互作用，因此会改变该地区藻类产量的最终命运。他们计划在最佳现场计划期间参加为春季冰冰条件提议的三个年度巡游中的每一次。他们将在最佳研究区域内的横断面沿指定站进行全套分析（常规库存确定和费率测量值）。将合并丰度和费率度量，以确定相对的微Zooplankton和中龙兰克顿放牧影响。虽然从该程序中得出的直接测量和观察结果将使主要研究人员可以描述东部贝林海货架的Microzooplankton和Mesozooplankton及其在无法可用的细节的放牧影响，但其衍生的数字也将对生态系统模型提供强大的约束，以制定最佳的生态系统。 这些模型将在合成最佳研究者提供的集体理解过程中成为重要的工具。