Collaborative Dissertation Research: Carbon and Nitrogen Pathways in Lake Ecosystems: The Influence of Nutrients and Food Webs on Benthic-pelagic Links

9520663 LODGE本提案将检验以下假设：湖泊食物网中底栖和中上层初级生产的相对重要性取决于湖泊营养状况，并受鱼类调节。 以往的结果表明，底栖生物和浮游生物通过营养关系密切相关，并形成碳和氮流的重要管道。 鱼类构成底栖和中上层群落，是底栖和中上层生境之间有机物质和营养物质的重要载体。 将采用稳定同位素方法，将这项研究纳入对底栖-中上层营养联系的全面了解。 稳定同位素将用于确定浮游食物网、底栖大型无脊椎动物群落和底栖藻类之间的营养联系。

9520663 LODGE This proposal will test the hypothesis that the relative importance of benthic and pelagic primary production in lake food webs is dependent on lake trophic status and is regulated by fish. Previous results indicate that benthic and pelagic organisms are strongly linked through trophic relationships and form important conduits for carbon and nitrogen flow. Fish structure benthic and pelagic communities and are important vectors of organic material and nutrients between benthic and pelagic habitats. A stable isotope method will be used to integrate this research into a comprehensive understanding of benthic-pelagic trophic links. The stable isotopes will be used to determine the trophic links between pelagic food webs, benthic macroinvertebrate communities, and benthic algae.