Dissertation Research: Role of a Dominant Grazer in a Headwater Stream Food Web.

论文研究：主要食草动物在源头河流食物网中的作用。

• 批准号: 0107427
• 负责人: Mary Power
• 金额: $ 0.9万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-06-01 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0107427&HistoricalAwards=false
• 关键词: Dissertation; Research; Role; Dominant; Grazer

Proposal: DEB-0107427PI: Power, Mary E., and Frances C. McNeelyTitle: Dissertation Research: Role of a Dominant Grazer in a Headwater Stream Food WebThe proposed research addresses a fundamental question in ecology: what determines the structure of food webs? In general, a suite of manipulative field experiments is designed to quantify the control that herbivorous species can exert on stream food webs. Manipulations of the abundance and phenology of a dominant grazing invertebrate (Glossosoma), in combination with stable isotope analyses, will determine if the presence and density of Glossosoma control the use of algae and detritus (alternative energy sources in streams) by other species of consumers. Because Glossosoma is relatively invulnerable to predation as a consequence of its morphology (a stone case), it may prevent predator species from exerting controls over herbivores. This will be quantified with regard to a common predator, the Giant Pacific Salamander (Dicamptodon tenebrosus). The proposed work will test in a rigorous manner, the hypothesis that herbivores exert "intermediate control" over the structure of food webs.

建议：Deb-0107427PI：Power，Mary E.和France C.McNeely标题：论文研究：在源头溪流食物网中占主导地位的食草动物的角色拟议的研究解决了生态学中的一个基本问题：什么决定了食物网的结构？总体而言，设计了一套操纵性的野外实验，以量化草食物种对溪流食物网的控制。对优势食草性无脊椎动物(Glossosoma)的丰度和物候的控制，结合稳定的同位素分析，将确定Glossosoma的存在和密度是否控制其他消费者物种对藻类和碎屑(溪流中的替代能源)的使用。由于舌虫的形态相对不受捕食的影响(这是一个石头案例)，它可能会阻止捕食者物种对草食动物施加控制。这将针对一种常见的捕食者--太平洋大蜥蜴(Dicamtop Don Tenebrosus)--进行量化。这项拟议的工作将以严格的方式测试食草动物对食物网结构施加“中间控制”的假设。