Microparasite species richness in rodents is higher at lower latitudes and is associated with reduced litter size
Microparasite species richness in rodents is higher at lower latitudes and is associated with reduced litter size
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DOI：
10.1111/j.1600-0706.2011.19314.x
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发表时间：
2011-12-01
期刊：
影响因子：
3.4
通讯作者：
Morand, Serge
中科院分区：
文献类型：
--
作者：
Bordes, Frederic;Guegan, Jean Francois;Morand, Serge
热带地区的寄生虫物种负荷预计较高，寄生虫物种丰富度较高，会对宿主生理或人口统计产生累积影响。尽管经常被假设或预测，但关于物种纬度模式的经验证据很少或相互矛盾，并且关于伴随感染的影响的研究主要是在宿主种内水平上进行的。因此，即使不是虚假的，广泛的概括也是非常困难的。通过关注啮齿动物物种及其非真核微寄生虫（即病毒和细菌），我们使用比较方法调查了啮齿动物物种中微寄生虫物种的丰富度（根据它们出现的纬度）。我们还探讨了啮齿类动物的繁殖特征、纬度和微寄生虫物种丰富度之间的联系。我们首次发现，在啮齿类动物中，病毒物种丰富度随着热带纬度的增加而增加，而当微寄生虫物种丰富度独立于纬度而增加时，啮齿类动物的产仔数似乎会减少。这些结果支持这样的假设：热带地区的啮齿动物物种实际上含有较高的寄生虫物种负荷，至少在病毒物种丰富度方面是如此，并且寄生虫物种丰富度影响啮齿动物的生活史特征。尽管由于缺乏数据而没有考虑季节性等其他因素，但我们的研究强调了慢性微寄生虫感染可能对其啮齿动物宿主宿主产生有害影响，特别是影响产仔数。
Parasite species loads are expected to be higher in the tropics and higher parasite species richness to have cumulative effects on host physiology or demography. Despite being regularly assumed or predicted, empirical evidence on specieslatitude patterns is scarce or contradictory and studies on the impacts of concomitant infections have mainly been done at host intra-specific level. Broad generalizations are then very hard, if not spurious.By focusing on rodent species and their non-eukaryotic microparasites (i.e. viruses and bacteria), we investigated, using a comparative approach, microparasite species richness across rodent species according to the latitude where they occur. We also explored the links between rodents' reproductive traits, latitude and microparasite species richness.We find for the first time in rodents that virus species richness increases towards tropical latitudes, and that rodent litter size seems to decrease when microparasite species richness increases independently from the latitude. These results support the hypotheses that rodent species in the tropics effectively harbour higher parasite species loads, at least in terms of species richness for viruses, and that parasite species richness influences rodent life-history traits. Although some other factors, such as seasonality, were not taken into account due the lack of data, our study stresses the idea that chronic microparasite infections may have detrimental effects on their rodent host reservoirs, notably by affecting litter size.