Collaborative Proposal - BEST: The Impact of Changes in Sea Ice Extent on Primary Production, Phytoplankton Community Structure, and Export in the eastern Bering Sea

合作提案 - BEST：海冰范围变化对白令海东部初级生产、浮游植物群落结构和出口的影响

• 批准号: 0732680
• 负责人: Edward Durbin
• 金额: $ 41.9万
• 依托单位: University of Rhode Island
• 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: 2007-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0732680&HistoricalAwards=false
• 关键词: Collaborative; Proposal; BEST; Impact; Changes

Moran 0732680Univ. of Rhode IslandFunds are provided to test the following core hypothesis: climate-driven interannual variability in sea-ice extent and duration shifts the eastern Bering Sea autotrophic community between one of two states; marginal ice-zone (MIZ) blooms vs. open-water blooms. The MIZ bloom state is characterized by high biomass, diatom-dominated blooms, high pelagic export and tight pelagic-benthic coupling, whereas the open-water bloom state is characterized by lower biomass, flagellate blooms, low pelagic export, and reduced pelagic-benthic coupling. This project will generate measurements of primary production using traditional 14C, 13C methods, and use the innovative triple oxygen isotope technique and dissolved oxygen concentrations to estimate gross and net primary production, respectively. This combination of productivity measurements will be used to test the hypothesis that while gross primary production does not change with sea-ice extent, net production does, and is inversely related to sea-ice extent.Phytoplankton community structure measurements will allow the PIs to test their hypothesis that the autotrophic community switches from a diatom-dominated, high export system in the MIZ, to a flagellate-dominated, lower export, system in open water blooms. 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. Characterization of rates of primary production by phytoplankton and the varying structure of the phytoplankton community in response to changing sea ice conditions will provide information about changes at the base of the food chain that will constrain models of the ecosystem. This information will be essential to a successful integrated ecosystem modeling protocol for the region.

Moran 0732680Univ。提供了罗德岛州基金来检验以下核心假设：海冰范围和持续时间的气候际变化使东部白令海自动营养社区在两个州之一之间转移；边缘冰区（MIZ）开花与开放水的开花。 Miz Bloom状态的特征是高生物质，硅藻为主导的盛开，高内膜导出和紧密的肾上腺纤维耦合，而开放水的绽放状态的特征是较低的生物量，鞭毛鲜花，低脊髓式出口，低脊髓出口和减少腰椎孔隙纤维螺旋体。 该项目将使用传统的14C，13C方法对初级生产产生测量，并使用创新的三氧同位素技术和溶解的氧气浓度分别估计总生产和净初级生产。 This combination of productivity measurements will be used to test the hypothesis that while gross primary production does not change with sea-ice extent, net production does, and is inversely related to sea-ice extent.Phytoplankton community structure measurements will allow the PIs to test their hypothesis that the autotrophic community switches from a diatom-dominated, high export system in the MIZ, to a flagellate-dominated, lower export, system in open water开花。该项目是一个较大计划的一部分，旨在发展对美国沿海水域高效地区东部白令海货架综合生态系统的理解。 该生态系统是美国商业渔业的主要部分的所在地，还为阿拉斯加的生存猎人和渔民提供了大量资源。 通过浮游植物的生产率和浮游植物群落的不同结构来响应不断变化的海冰条件，将提供有关食物链基础上的变化的信息，这将限制生态系统的模型。 该信息对于该地区成功的综合生态系统建模协议至关重要。