Dissertation Research: Linking an Invasive Ecosystem Engineer with Community and Ecosystem-Level Impacts: North American Beaver Effects on Stream Food Webs of Southern Chile

论文研究：将入侵生态系统工程师与社区和生态系统层面的影响联系起来：北美海狸对智利南部溪流食物网的影响

基本信息

批准号：
0407875
负责人：
Amy Rosemond
金额：
$ 1.19万
依托单位：
University of Georgia Research Foundation Inc
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2004
资助国家：
美国
起止时间：
2004-07-01 至 2006-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0407875&HistoricalAwards=false
关键词：
Dissertation Research Linking Invasive Ecosystem

项目摘要

The impact of invasive, introduced species on ecosystems is a critical area of research for ecology. Understanding the context-dependent responses of species and ecosystems to exotics is necessary to comprehend and predict current impacts and future alterations to vulnerable systems. The North American beaver introduction into southern Chile is a particularly compelling case because of the beaver's ability to engineer entire ecosystems. This introduction is having destructive impacts, causing dramatic changes in forests and streams. Stream food webs depend on forests for organic matter and shading. This study addresses the beaver's influences on stream invertebrate community structure, secondary production, trophic energy flow and food web dynamics in response to changes in streamside forest cover using novel techniques. It is expected that the beaver's cumulative impacts, shaping and structuring non-native communities and ecosystem function, may not be predictable based on North American studies, due to differences in vegetation and evolutionary history of beaver and forests in South America. The broader impacts of this dissertation will include cooperative research, education and conservation initiatives with local Chilean partners that will allow important parts of the research to be accomplished and also provide support and input to the local efforts.

入侵、引进物种对生态系统的影响是生态学研究的一个关键领域。了解物种和生态系统对外来物种的依赖环境的反应对于理解和预测脆弱系统当前的影响和未来的变化是必要的。北美河狸引入智利南部是一个特别引人注目的案例，因为河狸有能力改造整个生态系统。这种引入正在产生破坏性影响，导致森林和溪流发生巨大变化。河流食物网依赖森林提供有机物质和遮荫。本研究利用新技术探讨了河狸对溪流无脊椎动物群落结构、二次生产、营养能量流和食物网动态的影响，以响应溪边森林覆盖的变化。由于南美洲河狸和森林的植被和进化历史的差异，预计河狸的累积影响、塑造和构建非本地群落和生态系统功能可能无法根据北美研究进行预测。本论文的更广泛影响将包括与智利当地合作伙伴的合作研究、教育和保护举措，这将使研究的重要部分得以完成，并为当地的努力提供支持和投入。