Intensity of infection with intracellular Eimeria spp. and pinworms is reduced in hybrid mice compared to parental subspecies,Journal of Evolutionary Biology

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Intensity of infection with intracellular Eimeria spp. and pinworms is reduced in hybrid mice compared to parental subspecies
Journal of Evolutionary Biology ( IF 2.1 ) Pub Date : 2020-01-02 , DOI: 10.1111/jeb.13578
Alice Balard _{1,

2} , Víctor Hugo Jarquín-Díaz _{1,

2} , Jenny Jost _{1,

2} , Iva Martincová ₃ , Ľudovít Ďureje ₃ , Jaroslav Piálek ₃ , Miloš Macholán ₄ , Joëlle Goüy de Bellocq ₃ , Stuart J E Baird ₃ , Emanuel Heitlinger _{1,

2}

Affiliation

Genetic diversity in animal immune systems is usually beneficial. In hybrid recombinants, this is less clear, as the immune system could also be impacted by genetic conflicts. In the European house mouse hybrid zone, the long‐standing impression that hybrid mice are more highly parasitized and less fit than parentals persists despite the findings of recent studies. Working across a novel transect, we assessed infections by intracellular protozoans, Eimeria spp., and infections by extracellular macroparasites, pinworms. For Eimeria, we found lower intensities in hybrid hosts than in parental mice but no evidence of lowered probability of infection or increased mortality in the centre of the hybrid zone. This means ecological factors are very unlikely to be responsible for the reduced load of infected hybrids. Focusing on parasite intensity (load in infected hosts), we also corroborated reduced pinworm loads reported for hybrid mice in previous studies. We conclude that intensity of diverse parasites, including the previously unstudied Eimeria, is reduced in hybrid mice compared to parental subspecies. We suggest caution in extrapolating this to differences in hybrid host fitness in the absence of, for example, evidence for a link between parasitemia and health.

中文翻译：

细胞内艾美球虫感染的强度。与亲本亚种相比，杂交小鼠的蛲虫减少了

动物免疫系统的遗传多样性通常是有益的。在杂交重组体中，这一点不太清楚，因为免疫系统也可能受到遗传冲突的影响。在欧洲家鼠杂交区，尽管最近的研究有结果，但长期以来的印象仍然存在，即杂交小鼠比亲本更容易寄生且更不健康。我们在一个新的横断面上工作，评估了细胞内原生动物艾美球虫的感染和细胞外大寄生虫蛲虫的感染。对于艾美球虫，我们发现杂交宿主的强度低于亲本小鼠，但没有证据表明杂交区中心感染概率降低或死亡率增加。这意味着生态因素不太可能是受感染杂交种负载减少的原因。关注寄生虫强度（受感染宿主中的负载），我们还证实了先前研究中杂交小鼠报告的蛲虫负载减少。我们得出结论，与亲本亚种相比，杂种小鼠的各种寄生虫（包括先前未研究的艾美球虫）的强度降低。我们建议在没有证据表明寄生虫血症与健康之间存在联系的情况下，谨慎地将其推断为混合宿主适应性的差异。

更新日期：2020-01-02

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