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首页> 外文期刊>Parasitology >Negative covariance between parasite load and body condition in a population of feral horses
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Negative covariance between parasite load and body condition in a population of feral horses

机译：野马种群中寄生虫负荷与身体状况之间的负协方差

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摘要

In wild and domestic animals, gastrointestinal parasites can have significant impacts on host development, condition, health, reproduction and longevity. Improving our understanding of the causes and consequences of individual-level variation in parasite load is therefore of prime interest. Here we investigated the relationship between strongyle fecal egg count (FEC) and body condition in a unique, naturalized population of horses that has never been exposed to anthelmintic drugs (Sable Island, Nova Scotia, Canada). We first quantified variation in FEC and condition for 447 individuals according to intrinsic (sex, age, reproductive status, social status) and extrinsic (group size, location, local density) variables. We then quantified the repeatability of measurements obtained over a field season and tested for covariance between FEC and condition. FECs were high relative to other horse populations (mean eggs per gram +/- SD = 154328 +/- 20994). FECs generally decreased with age, were higher in lactating vs non-lactating females, and unexpectedly lower in males in some part of the island. FECs and condition were both spatially structured, with patterns depending on age, sex and reproductive status. FECs and condition were both repeatable. Most notably, FECs and condition were negatively correlated, especially in adult females.
机译：在野生和家养动物中，胃肠道寄生虫可对宿主的发育，状况，健康，繁殖和寿命产生重大影响。因此，最重要的是提高我们对寄生虫负荷中个体水平变化的原因和后果的理解。在这里，我们调查了从未接触过驱虫药的独特自然归化马群中的粪便菌卵数（FEC）与身体状况之间的关系（加拿大新斯科舍省黑貂岛）。我们首先根据内在（性别，年龄，生殖状况，社会地位）和外在（群体大小，位置，局部密度）变量对447个人的FEC和状况的变化进行了量化。然后，我们量化了在田间季节获得的测量值的可重复性，并测试了FEC和条件之间的协方差。相对于其他马群，FEC较高（每克平均卵数+/- SD = 154328 +/- 20994）。 FEC通常随着年龄的增长而下降，在哺乳期的雌性FEC高于未哺乳期的雌性，而在该岛的某些地区，男性则更低。 FECs和病情都是空间结构的，其模式取决于年龄，性别和生殖状况。 FEC和状况均可重复。最值得注意的是，FEC与病情呈负相关，特别是在成年女性中。

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