Invasion of an Exotic Cladoceran into North American Reservoirs

外来枝角类动物入侵北美水库

• 批准号: 9615374
• 负责人: W. John O'Brien
• 金额: --
• 依托单位: University of Kansas Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-05-15 至 1998-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9615374&HistoricalAwards=false
• 关键词: Invasion; Exotic; Cladoceran; into; North

ABSTRACT 96-15374 O'Brien Invasion of an exotic Cladoceran into North American Reservoirs Invasions of non-native species can cause profound problems by displacing or dominating indigenous species. One such recent invasion is that of Daphnia lumholtzi, a crustacean zooplankter that is invading the reservoirs of southeastern and south central North America. During the last five years D. lumholtzi has invaded 124 reservoirs in 21 states, including 29 reservoirs in Missouri and 5 in Kansas. Daphnia lumholtzi has an unusually large head and tail spines. These features would be expected to reduce predation and increase their competitive advantage compared with other daphnids lacking similar structures. The invasion of this species thus may dramatically alter freshwater food webs, where daphnids are often keystone species. In this project we will investigate the zoogeographic distribution of D. lumholtzi in Kansas and Missouri reservoirs, and will carry out extensive parallel limnological measurements. We will learn (1) what conditions affect the likelihood of invasions, and (2) the ecological effects on invaded food webs.

奥布莱恩外来枝梗类入侵北美水库非本地物种的入侵会取代或统治本地物种，从而导致严重的问题。其中一个最近的入侵是Daphnia lumholtzi，一种甲壳类动物，正在入侵北美东南部和中南部的水库。在过去的五年里，D。lumholtzi已经侵入了21个州的124个水库，其中包括密苏里州的29个水库和堪萨斯的5个水库。隆霍茨水蚤有一个异常大的头部和尾部的刺。与其他缺乏类似结构的水蚤相比，这些特征有望减少捕食并增加其竞争优势。因此，这种物种的入侵可能会极大地改变淡水食物网，而水蚤往往是关键物种。本项目主要研究了我国南方古猿的动物地理分布。在堪萨斯和密苏里州水库的lumholtzi，并将进行广泛的平行湖沼测量。我们将学习（1）什么条件会影响入侵的可能性，以及（2）对入侵食物网的生态影响。