Dissertation Research: Alternate States of Metalimnetic Systems Resulting from Cascading Trophic Interactions

论文研究：级联营养相互作用产生的元金属系统的交替状态

• 批准号: 8800578
• 负责人: Stephen Carpenter
• 金额: $ 0.65万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-07-01 至 1990-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8800578&HistoricalAwards=false
• 关键词: Dissertation; Research; Alternate; States; Metalimnetic

This study will evaluate the ability of metalimnetic phytoplankton to mitigate the effects on intergrated water column primary productivity of changes in piscivory. It is hypothesized that increased planktivory will lead to reduced grazing, increased epilimnetic chlorophyll, reduced transparency, and elimination of metalimnetic algae, thereby shifting the locus of production to the epilimnion with little change in total primary production. This mechanism could substantially alter the effects of cascading trophic interactions in lakes which support deep chlorophyll maxima. The hypothesis will be tested with a whole- lake planktivore addition experiment. Both experimental and control lakes presently support dense metalimnetic algal populations. Biomass budgets derived from this sampling and epilimnetic budgets derived from another project will be used to analyze the qualitative and quantitative effects of changes in planktivory within metalimnetic and epilimnetic algal populations, and the implications of those changes to total primary productivity.

这项研究将评估金属颗粒浮游植物减轻对piscivory变化的主要生产力的影响的能力。 假设木板增加将导致放牧减少，癫痫叶绿素降低，透明度降低和消除金属含量藻类，从而将产量的产量转移到静脉内，而总初级产量的变化很小。 这种机制可能会大大改变支持深叶绿素最大值的湖泊中层层相互作用的影响。 该假设将通过全湖浮游生物添加实验进行检验。 实验和对照湖泊目前都支持致密的金属藻类种群。 从另一个项目中得出的这种抽样和映标预算得出的生物量预算将用于分析金属智能和铭记藻类种群中浮游生物变化的定性和定量影响，以及这些变化对总初级生产力的含义。