REU: Mechanisms Controlling the Production and Fate of Insect Detritivores in the Profundal of Lakes

REU：控制湖泊深处昆虫碎屑动物的生产和命运的机制

• 批准号: 8706008
• 负责人: Malcolm Butler
• 金额: $ 8.6万
• 依托单位: North Dakota State University Fargo
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-15 至 1989-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8706008&HistoricalAwards=false
• 关键词: REU; Mechanisms; Controlling; Production; Fate

Much of the organic matter produced in lakes sinks to profundal sediments where it supports a community of benthic detritivores, often dominated by larvae of the Chironomidae. These insects (midges) are an important trophic link between phytoplankton and fish. It is generally thought that lakes more productive of phytoplankton will have higher secondary production by this detritivore community, and ultimately by fish. We do not know how closely these ecosystem components are linked, nor do we understand possible trophic and life history mechanisms for such coupling. This research asks whether production by profundal chironomids reflects the food supply to this community, or whether population densities are often too low to fully utilize available resources. Pilot experiments will develop techniques for manipulating food supply and larval recruitment to the profundal benthos to test hypotheses regarding factors that may limit profundal insect production. A model of secondary production by a dominant profundal species will also quantify the loss of production to fish through predation on ascending pupae. This work will clarify the role of the profundal benthos in the trophic linkage between primary production and fish.

湖泊中产生的大部分有机物沉降到 深海沉积物支持着海底生物群落 食草动物，通常以摇蚊科的幼虫为主。 这些昆虫（摇蚊）是一个重要的营养环节， 浮游植物和鱼类。 人们普遍认为湖泊 浮游植物的生产力将有较高的次级生产力 由食鱼动物群落，最终由鱼类。 我们不 我们知道这些生态系统的组成部分是如何紧密联系在一起的，我们也不知道。 了解可能的营养和生活史机制， 偶合器. 这项研究问是否生产的深 摇蚊反映了这个群落的食物供应，或者 人口密度是否太低而无法充分利用 现有资源。 试点实验将开发操纵技术， 向深海底栖生物提供食物和补充幼虫， 测试可能限制深海昆虫的因素的假设 生产 一个主导的次级生产模型 深海物种也将量化生产损失， 鱼通过捕食上升的腐皮。 这项工作将 阐明深海底栖生物在营养联系中的作用 初级生产和鱼类之间的关系。