Local adaptation drives thermal tolerance among parasite populations: a common garden experiment
Local adaptation drives thermal tolerance among parasite populations: a common garden experiment
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局部适应提高了寄生虫种群的热耐受性：一个常见的花园实验
DOI：
10.1098/rspb.2016.0587
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Blanchet
中科院分区：
文献类型：
--
作者：
Mazé-Guilmo;Blanchet
Understanding the evolutionary responses of organisms to thermal regimes is of prime importance to better predict their ability to cope with ongoing climate change. Although this question has attracted interest in free-living organisms, whether or not infectious diseases have evolved heterogeneous responses to climate is still an open question. Here, we ran a common garden experiment using the fish ectoparasiteTracheliastes polycolpus, (i) to test whether parasites living in thermally heterogeneous rivers respond differently to an experimental thermal gradient and (ii) to determine the evolutionary processes (natural selection or genetic drift) underlying these responses. We demonstrated that the reaction norms involving the survival rate of the parasite larvae (i.e. the infective stage) across a temperature gradient significantly varied among six parasite populations. Using aQst/Fstapproach and phenotype–environment associations, we further showed that the evolution of survival rate partly depended upon temperature regimes experiencedin situ, and was mostly underlined by diversifying selection, but also—to some extent—by stabilizing selection and genetic drift. This evolutionary response led to population divergences in thermal tolerance across the landscape, which has implications for predicting the effects of future climate change.
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