Collaborative: Assessing Effects of Food Web Structure on Patterns of Productivity and Trophic Transfer in Lake Food Webs

协作：评估食物网结构对湖泊食物网生产力和营养转移模式的影响

• 批准号: 9520884
• 负责人: Hunter Carrick
• 金额: $ 3.8万
• 依托单位: SUNY College at Buffalo
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-10-01 至 1998-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9520884&HistoricalAwards=false
• 关键词: Collaborative; Assessing; Effects; Food; Web

9520884 Carrick This research will examine the effect of upper food web configuration on pelagic ecosystem structure, carbon flow, and productivity in Castle Lake, California. This research builds on a whole lake food web manipulation, and augments the value and importance of a well-developed long term data set emphasizing biological and climatic determinants of primary productivity. In this project, food web configuration in Castle Lake will be manipulated by varying the stocking rates of rainbow trout. The manipulation will reduce rainbow trout, thus increasing the abundance of golden shiners, copepods, and micrograzers of bacteria. By measuring rates of microbial and primary production and assessing population and growth dynamics of metazoans and fish, this research will estimate patterns of production and carbon flow through the food web under different food web configurations. The response of the Castle Lake food web to trophic structure manipulation will be compared to concurrent dynamics in an unperturbed reference site, Cliff Lake. In addition to the whole lake manipulation, a series of meso- and microcosm experiments to address mechanisms determining food web structure will be conducted. This research will be summarized and synthesized within a quantitative simulation model. This quantitative framework will allow integration from investigations spanning a variety of spatial and temporal scales, and will allow interpretation of microbial and classic-based food web dynamics within the context of the long-term data record for the Castle Lake ecosystem.

本研究将探讨上层食物网配置对加州城堡湖中上层生态系统结构、碳流和生产力的影响。本研究建立在整个湖泊食物网操作的基础上，并增加了一个完善的长期数据集的价值和重要性，强调了初级生产力的生物和气候决定因素。在这个项目中，城堡湖的食物网配置将通过改变虹鳟鱼的放养率来控制。这种做法会减少虹鳟鱼的数量，从而增加金光鱼、桡足类和细菌微食草动物的数量。通过测量微生物和初级生产速率，评估后生动物和鱼类的种群和生长动态，本研究将估算不同食物网配置下食物网的生产模式和碳流。城堡湖食物网对营养结构操纵的响应将与一个未受干扰的参考地点克里夫湖的同步动态进行比较。除了整个湖泊的操作外，还将进行一系列中观和微观实验，以研究食物网结构的决定机制。本研究将在定量模拟模型中进行总结和综合。这个定量框架将允许整合跨越各种空间和时间尺度的调查，并将允许在城堡湖生态系统的长期数据记录背景下解释微生物和基于经典的食物网动态。