The contribution of post-copulatory mechanisms to incipient ecological speciation in sticklebacks

The contribution of post-copulatory mechanisms to incipient ecological speciation in sticklebacks
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交配后机制对刺鱼早期生态物种形成的贡献

DOI:
10.1098/rsbl.2014.0933
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发表时间:
2015
期刊:
影响因子:
3.3
通讯作者:
Milinski
Milinski
中科院分区:
生物学2区
文献类型:
--
作者:
Kaufmann;Eizaguirre;Milinski

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生态可以在物种多样化方面发挥重要作用。随着个体适应不同的栖息地,生殖障碍可能会在多个层面上演变。虽然交配前的障碍已经被广泛研究,但在生态物种形成的早期阶段,交配后生殖隔离的进化仍然知之甚少。在对来自两个湖泊和两条河流的三刺刺鱼生态型进行分流时,我们观察到了湖泊和河流雄性刺鱼精子特征的差异。有趣的是,在竞争静脉体外受精实验中,这些差异并没有转化为共面雄性的生态型特定配子优先,这可能是由于拮抗补偿效应。然而,我们观察到了阻碍生态型间合子发育的间接证据,可能表明生态型之间的遗传不亲和性处于早期阶段。我们的结果表明,合子前的交配后机制在生态型分化的第一阶段中起着次要的作用,但表明遗传不亲和性可能出现在生态物种形成的早期阶段。
Ecology can play a major role in species diversification. As individuals are adapting to contrasting habitats, reproductive barriers may evolve at multiple levels. While pre-mating barriers have been extensively studied, the evolution of post-mating reproductive isolation during early stages of ecological speciation remains poorly understood. In diverging three-spined stickleback ecotypes from two lakes and two rivers, we observed differences in sperm traits between lake and river males. Interestingly, these differences did not translate into ecotype-specific gamete precedence for sympatric males in competitivein vitrofertilization experiments, potentially owing to antagonistic compensatory effects. However, we observed indirect evidence for impeded development of inter-ecotype zygotes, possibly suggesting an early stage of genetic incompatibility between ecotypes. Our results show that pre-zygotic post-copulatory mechanisms play a minor role during this first stage of ecotype divergence, but suggest that genetic incompatibilities may arise at early stages of ecological speciation.
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