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Response of Plankton Biomass Across Gradients of Fish Density and Lake Trophic State: Experimental Test of the Fish X Lake Trophic State Interaction Hypothesis

浮游生物量对鱼类密度和湖泊营养状态梯度的响应：鱼类 X 湖泊营养状态相互作用假设的实验检验

基本信息

批准号：
8906653
负责人：
Ray Drenner
金额：
$ 14.88万
依托单位：
Texas Christian University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1989
资助国家：
美国
起止时间：
1989-08-01 至 1992-01-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8906653&HistoricalAwards=false
关键词：
Response Plankton Biomass Across Gradients

项目摘要

Ecologists have hypothesized that regulation of plankton communities by planktivores varies with lake trophic state, suggesting that an interaction effect exists between fish effects and lake trophic state effects on plankton communities. A fish x lake trophic state interaction effect is one that cannot be predicted by considering fish effects independently of lake trophic state effects. To date, there have been no tests of this fish x lake trophic state interaction hypothesis. In the proposed study, there are two principle parts: (1) a test of the fish x lake trophic state interaction hypothesis using outdoor tank experiments to examine the effects of five different densities of a planktivore, bluegill (Lepomis macrochirus), on the biomass and species composition of picoplankton, nanoplankton, microplankton, mesoplankton, and macroplankton from six lake communities representing the range of trophic states of southwestern reservoirs, and (2) the development of regression models for predicting biomass of picoplankton, nanoplankton, microplankton, mesoplankton, and macroplankton across gradients of fish density and lake trophic state. The study will provide the first view of how the impacts of different densities of fish on plankton biomass change with lake trophic state.

生态学家假设浮游生物的调节食草动物群落随湖泊营养状态而变化，这表明鱼类效应之间存在相互作用效应，以及湖泊营养状态对浮游生物群落的影响。鱼x 湖泊营养状态相互作用效应是一个不能通过考虑独立于湖泊的鱼类影响进行预测营养状态效应到目前为止，还没有对此进行测试鱼类与湖泊营养状态相互作用假说。在建议研究，有两个原则部分：（1）测试的鱼x湖营养状态相互作用假说，使用户外坦克实验，以检查五种不同的影响，密度的食鱼，蓝鳃鱼（蓝鳃鱼），微型浮游生物的生物量和种类组成，微型浮游生物、微型浮游生物、中型浮游生物和大型浮游生物，六个湖泊群落代表了西南部储层;（2）海退发育微型浮游生物，微型浮游生物，微型浮游生物、中型浮游生物和大型浮游生物跨越梯度鱼类密度和湖泊营养状态的关系。此项研究将提供第一种观点是不同密度的鱼类浮游生物量随湖泊营养状态的变化。