Diversity and the maintenance of sex by parasites
Diversity and the maintenance of sex by parasites
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DOI：
10.1111/jeb.12590
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发表时间：
2015-03-01
影响因子：
2.1
通讯作者：
King, K. C.
中科院分区：
文献类型：
--
作者：
Ashby, B.;King, K. C.
红皇后假说（RQH）预测，寄生虫介导的选择将保持在面对来自无性系的竞争有性个体。预测是，如果有性个体比无性谱系产生更多遗传多样性的后代，那么它们将是共同进化的寄生虫的困难目标。然而，已知宿主遗传多样性的增加会抑制寄生虫的传播，这可能为克隆谱系提供短期优势，并导致性别灭绝。我们使用基于个体的随机模型来测试这些想法。我们发现，如果寄生虫是容易传播的，那么性别是最有可能保持宿主多样性高，在协议与RQH。然而，如果传播率较低，我们发现性种群最有可能持续中等水平的多样性。因此，我们的研究结果强调了遗传多样性的重要性及其对寄生虫维持性别的流行病学动态的影响。
The Red Queen hypothesis (RQH) predicts that parasite-mediated selection will maintain sexual individuals in the face of competition from asexual lineages. The prediction is that sexual individuals will be difficult targets for coevolving parasites if they give rise to more genetically diverse offspring than asexual lineages. However, increasing host genetic diversity is known to suppress parasite spread, which could provide a short-term advantage to clonal lineages and lead to the extinction of sex. We test these ideas using a stochastic individual-based model. We find that if parasites are readily transmissible, then sex is most likely to be maintained when host diversity is high, in agreement with the RQH. If transmission rates are lower, however, we find that sexual populations are most likely to persist for intermediate levels of diversity. Our findings thus highlight the importance of genetic diversity and its impact on epidemiological dynamics for the maintenance of sex by parasites.