RUI: A Geomorphic-Tropic Hypothesis for Benthic-Pelagic Coupling in Arctic Lakes

RUI：北极湖泊底栖-远洋耦合的地貌-回归假说

• 批准号: 0516043
• 负责人: Anne Hershey
• 金额: $ 118.11万
• 依托单位: University of North Carolina Greensboro
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-15 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0516043&HistoricalAwards=false
• 关键词: RUI; Geomorphic; Tropic; Hypothesis; Benthic

RUI: A GEOMORPHIC-TROPHIC HYPOTHESIS FOR BENTHIC-PELAGIC COUPLING IN ARCTIC LAKES Studies of lakes have traditionally focused on control of phytoplankton, or pelagic, production by nutrients or food webs. However, there is growing recognition that algal and invertebrate production on the lake bottom, or benthic habitat, and benthic-pelagic coupling are also important to lake food webs and whole-lake productivity. Furthermore, the role organic matter from the surrounding terrestrial plant community in fueling lake food webs has been underemphasized. In arctic lakes, recent research has shown that coupling to the terrestrial landscape and benthic-pelagic coupling may be especially important to lake food webs and productivity. The project will examine landscape control of lake food webs, the distribution of algal productivity between pelagic and benthic habitats, and coupling of those habitats through food web and chemical and physical processes. Approaches include whole-lake tracer experiments using 15N, a stable nitrogen isotope, comparison of lakes with contrasting fish communities in constrasting landscape settings, microcosms manipulations of organic matter sources and food webs, and modeling. This research will result in improved understanding of landscape control and benthic-pelagic coupling to lake food webs and productivity. The work will train undergraduate and graduate students, and will be used by natural resource managers in Alaska and other northern regions where pristine lakes are currently being threatened by global warming, eutrophication, and other disturbances.

传统上，对湖泊的研究主要集中在通过营养物质或食物网控制浮游植物或上层生物的生产。然而，越来越多的人认识到，湖底或底栖生物栖息地的藻类和无脊椎动物生产以及底栖-上层耦合对湖泊食物网和整个湖泊的生产力也很重要。此外，来自周围陆生植物群落的有机质在湖泊食物网中的作用被低估。在北极湖泊中，最近的研究表明，与陆地景观的耦合以及底底-上层的耦合可能对湖泊食物网和生产力特别重要。该项目将审查湖泊食物网的景观控制，浮游生物和底栖生物栖息地之间藻类生产力的分布，以及这些栖息地通过食物网和化学和物理过程的耦合。方法包括使用15N（一种稳定的氮同位素）进行全湖示踪实验，在不同景观环境下对湖泊与不同鱼类群落进行比较，有机物质来源和食物网的微观操作，以及建模。这项研究将有助于提高对湖泊食物网和生产力的景观控制和底-上层耦合的理解。这项工作将培训本科生和研究生，并将用于阿拉斯加和其他北部地区的自然资源管理人员，这些地区的原始湖泊目前正受到全球变暖、富营养化和其他干扰的威胁。