Metrics matter: the effect of parasite richness, intensity and prevalence on the evolution of host migration

Metrics matter: the effect of parasite richness, intensity and prevalence on the evolution of host migration
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指标很重要:寄生虫丰富度、强度和流行率对宿主迁徙进化的影响

DOI:
10.1098/rspb.2018.2147
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发表时间:
2018
期刊:
Proceedings of the Royal Society B: Biological Sciences
影响因子:
--
通讯作者:
Zuk, Marlene
Zuk, Marlene
中科院分区:
--
文献类型:
--
作者:
Shaw, Allison K.;Sherman, Julie;Barker, F. Keith;Zuk, Marlene

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长期以来,寄生虫一直被认为会影响迁移的演变,但通过量化感染成本来精确确定这种情况发生的条件仍然是一个挑战。在这里,我们开发了一个模型,展示了用于描述感染的度量(丰富度/多样性,流行率或强度)如何塑造移民是否会演变的预测。该模型表明,基于最小化丰富度的预测结果与基于最小化流行率的预测结果相反,只有在最小化流行率时才选择迁移。与这些发现相一致的是,测量寄生虫多样性的实证研究通常发现,移民的情况比居民更糟,而那些测量流行率或强度的研究发现相反。我们自己对鱼类寄生虫数据的实证分析发现,移民(所有类型)的寄生虫丰富度高于居民,但患病率或强度没有显着差异。
Parasites have long been thought to influence the evolution of migration, but precisely determining the conditions under which this occurs by quantifying costs of infection remains a challenge. Here we developed a model that demonstrates how the metric used to describe infection (richness/diversity, prevalence or intensity) shapes the prediction of whether migration will evolve. The model shows that predictions based on minimizing richness yield opposite results compared to those based on minimizing prevalence, with migration only selected for when minimizing prevalence. Consistent with these findings, empirical studies that measure parasite diversity typically find that migrants are worse off than residents, while those measuring prevalence or intensity find the opposite. Our own empirical analysis of fish parasite data finds that migrants (of all types) have higher parasite richness than residents, but with no significant difference in either prevalence or intensity.
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