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首页> 外文期刊>The Royal Society Proceedings B: Biological Sciences >Host densities as determinants of abundance in parasite communities.
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Host densities as determinants of abundance in parasite communities.

机译：寄主密度是寄生虫群落中丰富度的决定因素。

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摘要

Several epidemiological models predict a positive relationship between host population density and abundance of directly transmitted macroparasites. These models are generalized and tested by a comparative study, using data on communities of gastrointestinal strongylid nematodes from 19 mammalian species, representing the examination of 6670 individual hosts. Both the average abundance of all strongylid nematodes within a host species and the 2 components of abundance (prevalence and intensity) were studied. The effects of host body weight, diet, fecundity and age at maturity and parasite body size were controlled for directly, and the phylogenetically independent contrast method was used to control for confounding factors more generally. Host population density and average parasite abundance were strongly positively correlated within mammalian taxa, and across all species when the effects of host body weight were controlled for. Controlling for other variables did not change this. Even with a single parasite species occurring in several host species, abundance was highest in the host species with the highest population density. Prevalence and intensity showed similar patterns. These patterns provide the first macroecological evidence consistentwith the prediction that transmission rates depend on host population density in natural parasite communities.
机译：几种流行病学模型预测寄主种群密度与直接传播的大量寄生虫数量之间呈正相关。通过使用来自19个哺乳动物物种的胃肠道强线虫线虫群落的数据，对这些模型进行了概括和测试，进行了比较研究，代表了对6670名个体宿主的检查。研究了寄主物种内所有线虫线虫的平均丰度和丰度的两个组成部分（患病率和强度）。直接控制宿主体重，饮食，繁殖力和成熟度以及寄生虫体型的影响，并使用系统发育独立对比方法更普遍地控制混杂因素。在控制宿主体重的影响下，哺乳动物分类群内以及所有物种之间的寄主种群密度和平均寄生虫丰度均呈强正相关。控制其他变量并没有改变这一点。即使在多个寄主物种中出现单个寄生虫物种，其种群密度最高的寄主物种中的丰度也最高。患病率和强度显示出相似的模式。这些模式提供了第一个宏观生态学证据，与传播速率取决于自然寄生虫群落中寄主种群密度的预测相一致。

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