A parasite-mediated life-history shift in Daphnia magna
A parasite-mediated life-history shift in Daphnia magna
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DOI：
10.1098/rspb.2004.2959
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发表时间：
2005-03-07
影响因子：
4.7
通讯作者：
Little, TJ
中科院分区：
文献类型：
--
作者：
Chadwick, W;Little, TJ
寄生对寄主种群的影响将受到易感性的遗传变异和表型可塑性生活史特征的调节，这些表型生活史特征被改变，以减轻感染的适应后果。在这项研究中，我们测试了甲壳类大型水蚤在暴露于水平传播的微孢子虫Glugoids enterinalis后的生活史变化。在两个独立的实验中，我们将宿主暴露在寄生虫孢子中，并测量了它们相对于对照组的繁殖力。我们发现，暴露于肠虫的寄主表现出繁殖力补偿，即寄主将其生活史策略转向早期繁殖。我们的实验包括多种寄主基因型，它们之间的细微差异表明，繁殖力补偿可能受制于寄生虫介导的自然选择。
The impact of parasitism on host populations will be modulated by both genetic variation for susceptibility, and phenotypically plastic life-history traits that are altered to lessen the fitness consequences of infection. In this study we tested for life-history shifts in the crustacean Daphnia magna following exposure to the horizontally transmitted microsporidian, Glugoides intestinalis. In two separate experiments, we exposed hosts to parasite spores and measured their fecundity relative to controls. We show that hosts exposed to G. intestinalis show fecundity compensation, i.e. hosts shift their life-history strategy towards early reproduction. Our experiments included multiple host genotypes, and subtle differences among them indicated that fecundity compensation could be subject to parasite-mediated natural selection.