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Abiotic versus biotic hierarchies in the assembly of parasite populations.

机译：寄生虫种群聚集中的非生物与生物层次结构。

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摘要

The presence or absence of parasites within host populations is the result of a complex of factors, both biotic and abiotic. This study uses a non-parametric classification tree approach to evaluate the relative importance of key abiotic and biotic drivers controlling the presence/absence of parasites with complex life cycles in a sentinel, the common killifish Fundulus heteroclitus. Parasite communities were classified from 480 individuals representing 15 fish from 4 distinct marsh sites in each of 4 consecutive seasons between 2006 and 2007. Abiotic parameters were recorded at continuous water monitoring stations located at each of the 4 sites. Classification trees identified the presence of benthic invertebrate species (Gammarus sp. and Littorina sp.) as the most important variables in determining parasite presence: secondary splitters were dominated by abiotic variables including conductance, pH and temperature. Seventy percent of hosts were successfully classified into the correct category (infected/uninfected) based on only these criteria. The presence of competent definitive hosts was not considered to be an important explanatory variable. These data suggest that the most important determinant of the presence of these parasite populations in the common killifish is the availability of diverse communities of benthic invertebrates.
机译：寄主种群中是否存在寄生虫是生物和非生物因素共同作用的结果。这项研究使用非参数分类树方法来评估关键的非生物和生物驱动因素的相对重要性，这些驱动因素控制着存在或不存在具有复杂生命周期的常见寄生鱼（即kill鱼，底栖鱼类）的寄生虫。在2006年至2007年的连续4个季节中，对来自480个个体的寄生虫群落进行了分类，这些个体代表来自4个不同沼泽地的15条鱼。在四个地点中每个地点的连续水监测站记录了非生物参数。分类树将底栖无脊椎动物物种（伽玛鲁斯和Littorina物种）的存在确定为确定寄生虫存在的最重要变量：次级分离器主要由非生物变量控制，包括电导率，pH和温度。仅根据这些条件，百分之七十的宿主就可以成功地分类为正确的类别（感染/未感染）。合格的权威宿主的存在不被认为是重要的解释变量。这些数据表明，在常见的幼鱼中这些寄生虫种群的存在的最重要的决定因素是底栖无脊椎动物多样性社区的可用性。

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