Temperature‐dependent costs of parasitism and maintenance of polymorphism under genotype‐by‐environment interactions
Temperature‐dependent costs of parasitism and maintenance of polymorphism under genotype‐by‐environment interactions
复制标题
基因型与环境相互作用下寄生和多态性维持的温度依赖性成本
DOI：
10.1111/j.1420-9101.2008.01555.x
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发表时间：
2008
影响因子：
2.1
通讯作者：
T. Little
中科院分区：
文献类型：
--
作者：
P. Vale;Martin Stjernman;M. Stjernman;T. Little
The maintenance of genetic variation for infection‐related traits is often attributed to coevolution between hosts and parasites, but it can also be maintained by environmental variation if the relative fitness of different genotypes changes with environmental variation. To gain insight into how infection‐related traits are sensitive to environmental variation, we exposed a single host genotype of the freshwater crustacean Daphnia magna to four parasite isolates (which we assume to represent different genotypes) of its naturally co‐occurring parasite Pasteuria ramosa at 15, 20 and 25 °C. We found that the cost to the host of becoming infected varied with temperature, but the magnitude of this cost did not depend on the parasite isolate. Temperature influenced parasite fitness traits; we found parasite genotype‐by‐environment (G × E) interactions for parasite transmission stage production, suggesting the potential for temperature variation to maintain genetic variation in this trait. Finally, we tested for temperature‐dependent relationships between host and parasite fitness traits that form a key component of models of virulence evolution, and we found them to be stable across temperatures.
