Incipient allochronic speciation by climatic disruption of the reproductive period
Incipient allochronic speciation by climatic disruption of the reproductive period
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DOI：
10.1098/rspb.2009.0349
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发表时间：
2009-08-07
影响因子：
4.7
通讯作者：
Sota, Teiji
中科院分区：
文献类型：
--
作者：
Yamamoto, Satoshi;Sota, Teiji
对生命周期时间的破坏性选择可能直接导致时间上的隔离，并最终导致异时物种形成。尽管在不同的类群中广泛观察到了相关物种之间生殖期的分离，但时间隔离是否可以作为物种形成的主要过程仍然存在争议。在日本冬季斑点夜蛾中，异时分化是由于生殖期的气候干扰造成的。在隆冬严寒的生境中，初冬和晚冬两个同域种群异时繁殖。这些群体在基因上是不同的姐妹血统，现在在日本各地共同出现。相比之下，在隆冬较温和的栖息地，这些血统形成了一个连续的成虫期，血统之间的基因流动得到了促进。这些结果，再加上幼虫对寄主的利用没有差异的事实，表明在较冷的生境中，时间隔离一直是同种异时隔离的唯一机制，异时作用不是其他适应的副产品。因此，同域斑点伊蚊种群的异时分化代表了一种由隆冬扰乱生殖期驱动的早期物种形成过程。
Disruptive selection of life-cycle timing may cause temporal isolation directly and, ultimately, allochronic speciation. Despite the fact that segregation of the reproductive period among related species has been broadly observed across taxa, it remains controversial whether temporal isolation can function as the primary process of speciation. In the Japanese winter geometrid moth Inurois punctigera, allochronic divergence has resulted from climatic disruption of the reproductive period. In habitats with severe midwinter, two sympatric groups of moth reproduce allochronically in early and late winter. These groups are genetically diverging sister lineages and now co-occur allochronically throughout Japan. By contrast, in habitats with milder midwinter these lineages form a continuous adult period and gene flow has been facilitated between the lineages. These results, together with the fact that there is no difference in larval host use, indicate that temporal isolation has been the sole mechanism for allochronic isolation in colder habitats and that allochrony is not a by-product of other adaptations. Thus, the allochronic divergence of sympatric I. punctigera populations represents an incipient speciation process driven by midwinter disruption of the reproductive period.