Dissertation Research: Impacts of Logging on Patterns and Processes in a Parasite-Host Association

论文研究：日志记录对寄生虫-宿主关联模式和过程的影响

• 批准号: 9701128
• 负责人: Wayne Sousa
• 金额: $ 0.75万
• 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: 1997
• 资助国家: 美国
• 起止时间: 1997-05-15 至 1999-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9701128&HistoricalAwards=false
• 关键词: Dissertation; Research; Impacts; Logging; Patterns

9701128 Sousa Though many studies have addressed the impacts of anthropogenic disturbances on free-living species, few have considered how these impacts might disrupt the tight links between parasites and their hosts. In this study the PIs investigate the impacts of logging-induced disturbance on the density and distribution of a suite of stream-dwelling species and ask how these changes can alter dynamics of their shared trematode parasite. The trematode parasite, Cephalouterina dicamptodoni, obligately and sequentially infects larval Pacific giant salamanders (Dicamptodon tenebrosus), a common aquatic snail (Juga silicula) and a nymphal stonefly (Calineuria californica). This study consists of three phases: 1) documentation of the effects of logging on the density and distribution of each host species; 2) examination of the patterns of parasite prevalence and abundance within each host species from both logged and unlogged streams; and 3) experimental investigation of the hypothesis that disturbance-induced changes in host distributions and densities alter parasite transmission processes and in turn parasite population dynamics. This work is the first to explore the impacts of logging on both patterns and mechanisms of parasite-host interactions.

虽然许多研究已经解决了人为干扰对自由生活物种的影响，但很少有人考虑这些影响如何破坏寄生虫与宿主之间的紧密联系。在这项研究中，PI调查了伐木引起的干扰对一套流居物种的密度和分布的影响，并询问这些变化如何改变其共享的吸虫寄生虫的动态。吸虫寄生虫，Cephalouterina dicamptodoni，专性和顺序感染幼虫太平洋大鲵（Dicamptodon tenebrosus），一种常见的水生蜗牛（Juga silicula）和若虫stonphal（Calineuria californica）。本研究包括三个阶段：1）记录采伐对每种寄主密度和分布的影响; 2）检查采伐和未采伐溪流中每种寄主内寄生虫的流行和丰度模式;（3）对干扰--宿主分布和密度的诱导变化改变了寄生虫传播过程，进而改变了寄生虫种群动态。 这项工作是第一个探索的影响，日志的模式和机制的寄生虫-主机相互作用。