DISSERTATION RESEARCH: Food webs in stable isotope space: How patch size and connectivity alter food web structure, functional redundancy, and trophic position

论文研究：稳定同位素空间中的食物网：斑块大小和连通性如何改变食物网结构、功能冗余和营养位置

• 批准号: 0710004
• 负责人: William Fagan
• 金额: $ 1.16万
• 依托单位: University of Maryland, College Park
• 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 2010-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0710004&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Food; webs; stable

Food web structure influences community stability, nutrient cycling, and primary productivity. Spatial ecology, on the other hand, has identified the primary roles that patch size and connectivity play in determining the presence and abundance of species in patchy habitats. This project aims to bridge the gap between these research programs, using stable isotope analyses to elucidate how food web structure depends on patch size and context. As the ratio of heavy to light isotopes of nitrogen and carbon measure trophic position and the ultimate sources of species' biomass, the isotopic signatures of all species in a community can provide a quantitative measure of functional food web structure. Using a well-studied salt marsh arthropod community, this project will quantify the effects of patch size and connectivity on the diversity and redundancy of realized trophic positions and determine whether species' trophic positions are themselves functions of patch spatial context.This grant provides a much-needed synthesis of food web and spatial ecology that leverages a novel application of stable isotopic analysis to understand resource flow in a heterogeneous landscape. In doing so, it provides integrative training for a female graduate student, as well as basic ecological knowledge of a sensitive, economically important ecosystem.

食物网结构影响群落稳定性、养分循环和初级生产力。 另一方面，空间生态学已经确定了斑块大小和连通性在决定斑块生境中物种的存在和丰度方面所起的主要作用。 该项目旨在弥合这些研究项目之间的差距，利用稳定同位素分析来阐明食物网结构如何取决于斑块大小和背景。 由于氮和碳的重轻同位素的比率衡量营养位置和物种生物量的最终来源，因此群落中所有物种的同位素特征可以提供功能食物网结构的定量测量。 利用一个经过充分研究的盐沼节肢动物群落，该项目将量化斑块大小和连通性对已实现的营养位置的多样性和冗余度的影响，并确定物种的营养位置本身是否是斑块空间背景的函数。需要综合食物网和空间生态学，利用稳定同位素分析的新应用，以了解资源流动，异质景观 在这样做的过程中，它为女研究生提供综合培训，并提供敏感的、具有重要经济意义的生态系统的基本生态知识。