Dissertation Research: The Influence of Predation on Mayfly Assemblages: Comparative Studies in Neotropical Streams

论文研究：捕食对蜉蝣群落的影响：新热带溪流的比较研究

• 批准号: 8701014
• 负责人: David Allan
• 金额: $ 1.28万
• 依托单位: University of Maryland, College Park
• 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: 1987-07-01 至 1989-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8701014&HistoricalAwards=false
• 关键词: Dissertation; Research; Influence; Predation; Mayfly

Little is known about the role of predators in tropical rivers. This study will examine predator prey relationships in a series of Venezuelan streams, where a wide range of predation regimes are found in close proximity. In order to investigate the direct and indirect effects of predators on mayflies (Order:Ephemeroptera), a series of comparative studies will be conducted between streams that range from naturally fishless to others containing 60 fish species. Direct effects of predators will be examined by performing field enclosure/exclosure experiments. Field experiments will be coupled with data on mayfly drift, predator numbers and diet, to determine if the efficacy of predators in controlling prey abundance differs according to predator density and/or prey recolonization potential. Indirect effects of predators will be examined in several contexts. Diel patterns of mayfly drift and activity on stone tops will be compared between sites. Cinematography will be used to explore the importance of predators in determining both when and where mayflies forage, and the effects of predator harassment on foraging efficiency. Findings from this research will have bearing on general questions concerning the significance of predation in structuring lotic systems and whether the role of biotic interactions differs between tropical and temperate systems. Professor J. D. Allan and doctoral candidate A. S. Flecker are well qualified to conduct the investigation which will entail significant logistic and scientific challenges. The ecology of neotropical rivers is an important area for ecological research.

关于热带雨林中捕食者的作用， 河流 本研究将探讨捕食者与被捕食者的关系， 一系列委内瑞拉的溪流，在那里， 政权是紧密相连的。 为了研究 捕食者对蜉蝣的直接和间接影响 （目：蜉蝣目），一系列的比较研究将在 在河流之间进行，从自然无鱼到 有60种鱼类。 捕食者的直接影响 将通过进行现场封闭/围封进行检查 实验现场实验将结合以下数据： 蜉蝣漂移，捕食者数量和饮食，以确定是否 捕食者控制猎物数量的效率 根据捕食者密度和/或被捕食者密度 潜力 捕食者的间接影响将在 几个背景。 蜉蝣漂移和活动的昼夜模式 将比较不同地点的石顶。电影将是 用来探索捕食者在决定 蜉蝣觅食的时间和地点以及捕食者的影响 对觅食效率的影响 这项研究的结果 将影响到有关的一般问题， 捕食在构建lotic系统中的重要性， 生物相互作用的作用是否在热带和热带之间不同， 温和的系统。 J.D.教授艾伦和博士候选人A。S. 弗莱克很有资格进行调查， 将带来重大的后勤和科学挑战。 的 新热带河流生态学是生态学的重要领域， research.