Effects of Anadromous Salmon on North Shore Stream Ecosystems

溯河产卵鲑鱼对北岸溪流生态系统的影响

• 批准号: 9119417
• 负责人: Anne Hershey
• 金额: $ 38.58万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-04-15 至 1995-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9119417&HistoricalAwards=false
• 关键词: Effects; Anadromous; Salmon; North; Shore

For streams on the North Shore of Lake Superior, salmon are a recently introduced exotic species, and may be altering the stream ecosystems from their historic state. Are salmon migrations into streams a significant source of nutrients and high quality organic matter for these stream ecosystems? The importance of migration salmon in nutrient and organic matter flow through stream ecosystem components will be tested using experimental, comparative, and stable isotope tracer techniques. It is hypothesized that the presence of salmon will: 1) result in a shift away from terrestrial sources of organic matter and inorganic nutrients toward lake derived sources (salmon carcasses and spawn); and 2) will alter the seasonal patterns of nutrient limitation. This shift will be reflected in changes in periphyton, fine particle and dissolved organic carbon, grazer, shredder, and collector components of the ecosystem which can be traced using stable isotopes. It is further hypothesized that, 3) the size of a patch of salmon carcasses determines the spatial scale of the effect on the resource within the ecosystem. A combination of experimental and comparative studies will provide insight into the interdependence of nutrient limitation and nutrient and organic matter flow through these stream ecosystems.

对于苏必利尔湖上级北岸的溪流来说，鲑鱼是 最近引进的外来物种，并可能改变 使生态系统脱离历史状态。 是鲑鱼 迁移到溪流中，成为营养物质的重要来源， 高质量的有机物对这些河流生态系统的影响 的 洄游鲑鱼营养和有机质重要性 通过河流生态系统组件的流量将使用 实验、比较和稳定同位素示踪技术。 据推测，鲑鱼的存在将：1）导致 从陆地来源的有机物质转移， 无机营养物向湖泊来源（鲑鱼尸体 并产卵）; 2）将改变营养的季节模式 限制. 这一转变将反映在 附着生物、细颗粒物和溶解有机碳、食草动物、 切碎机和收集器组件的生态系统，可以 用稳定同位素追踪。 进一步假设， 3)一块鲑鱼尸体的大小决定了 对生态系统内资源的影响程度。 一 实验和比较研究的结合将提供 深入了解营养限制的相互依存关系， 养分和有机物流经这些河流生态系统。