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Haemoproteus infected birds have increased lifetime reproductive success

机译：受血红蛋白感染的鸟类提高了终生繁殖成功率

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The impact of haematozoan infection on host fitness has received substantial attention since Hamilton and Zuk posited that parasites are important drivers of sexual selection. However, short-term studies testing the assumption that these parasites consistently reduce host fitness in the wild have produced contradictory results. To address this complex issue, we conducted a long-term study examining the relationship between naturally occurring infection with Haemoproteus and Plasmodium, and lifetime reproductive success and survival of Mountain White-crowned Sparrows. Specifically, we tested the hypothesis that birds infected with haematozoan parasites have reduced survival (as determined by overwinter return rates) and reproductive success. Contrary to expectation, there was no relationship between Haemoproteus and Plasmodium infection and reproduction or survival in males, nor was there a relationship between Plasmodium infection and reproduction in females. Interestingly, Haemoproteus-infected females had significantly higher overwinter return rates and these females fledged more than twice as many chicks during their lifetimes as did uninfected females. We discuss the impact of parasitic infections on host fitness in light of these findings and suggest that, in the case of less virulent pathogens, investment in excessive immune defence may decrease lifetime reproduction.
机译：自汉密尔顿和祖克提出寄生虫是性选择的重要驱动因素以来，血吸虫感染对宿主适应性的影响已受到广泛关注。然而，短期研究测试了这些寄生虫在野外持续降低宿主适应性的假设，得出了矛盾的结果。为了解决这个复杂的问题，我们进行了一项长期研究，研究了血红蛋白和疟原虫的自然感染与山白冠麻雀的终生生殖成功和生存之间的关系。具体而言，我们测试了以下假设：感染了血原虫的鸟类降低了存活率（由越冬返还率确定）并获得了繁殖成功。与预期相反，男性中血红蛋白和疟原虫感染与生殖或存活之间没有关系，女性中疟原虫感染与生殖没有关系。有趣的是，感染了变形杆菌的雌性的越冬归巢率明显更高，这些雌性一生中的雏鸡逃生率是未感染雌性的两倍。根据这些发现，我们讨论了寄生虫感染对宿主健康的影响，并建议，在低致病性病原体的情况下，对过度免疫防御的投资可能会减少终生繁殖。

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