Dissertation Research: Evaluating changes in food web linkages and mercury bioaccumulation by top predators in response to the removal of an introduced predator

论文研究：评估食物网联系和顶级捕食者汞生物累积的变化，以响应外来捕食者的清除

• 批准号: 0710279
• 负责人: Clifford Kraft
• 金额: $ 1.11万
• 依托单位: Cornell Univ - State: AWDS MADE PRIOR MAY 2010
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-06-01 至 2008-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0710279&HistoricalAwards=false
• 关键词: Dissertation; Research; Evaluating; changes; food

This project will investigate the food web effects of removing a widely introduced non-native predator found in northern lakes. Smallmouth bass were introduced into the study lake more than 50 years ago, which resulted in reduced abundance of native prey fish and major food web changes. A smallmouth bass removal program implemented in 2000 resulted in increased native prey fish abundance, restoration of food web linkages (measured using stable isotopes in fish tissue), and changes in mercury concentrations in top predators. Project goals are to: 1) quantify changes in lake fish communities, food web linkages and mercury bioaccumulation that have occurred in response to the ongoing removal effort, 2) evaluate the processes responsible for these changes, 3) and evaluate predator removal/control as a tool to manage lake ecosystems.Limited information is available regarding the effects of large-scale predator manipulations, which are commonly implemented to provide recreational angling opportunities in North American lakes. Results from this study will provide an improved ability to: 1) use stable isotopes in fish tissue as a metric for lake restoration, 2) understand and alter processes responsible for mercury accumulation in sport fish, and 3) implement management approaches to restore native fish communities impacted by dominant non-native species.

该项目将调查消除北部湖泊中广泛引入的非本地捕食者对食物网的影响。 50 多年前，小口黑鲈被引入研究湖，导致本地猎物鱼类数量减少，食物网发生重大变化。 2000 年实施的小口黑鲈清除计划增加了本地被捕食鱼类的丰度，恢复了食物网联系（使用鱼类组织中的稳定同位素进行测量），并改变了顶级捕食者体内的汞浓度。项目目标是：1) 量化因持续清除工作而发生的湖泊鱼类群落、食物网联系和汞生物累积的变化，2) 评估造成这些变化的过程，3) 并评估捕食者清除/控制作为管理湖泊生态系统的工具。有关大规模捕食者操纵的影响的信息有限，大规模捕食者操纵通常是为了在北美湖泊提供休闲钓鱼机会而实施的。这项研究的结果将提供改进的能力：1）使用鱼类组织中的稳定同位素作为湖泊恢复的指标，2）了解和改变运动鱼中汞积累的过程，以及3）实施管理方法来恢复受主要非本地物种影响的本地鱼类群落。