Allopatric origin, secondary contact and subsequent isolation of sympatric rockfishes (Sebastidae: <i>Sebastes</i>) in the north-western Pacific
Allopatric origin, secondary contact and subsequent isolation of sympatric rockfishes (Sebastidae: <i>Sebastes</i>) in the north-western Pacific
复制标题
西北太平洋同域石斑鱼（Sebastidae：<i>Sebastes</i>）的异域起源、二次接触和随后的分离
DOI：
10.1093/biolinnean/blac135
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发表时间：
2022
影响因子：
1.9
通讯作者：
Kai Yoshiaki
中科院分区：
文献类型：
--
作者：
Muto Nozomu;Kai Yoshiaki
了解物种形成是如何发生的是生物学的核心。不同类群之间的基因流动与地理和物种形成的其他方面相关，因此，在分歧过程中的基因流动的检查是一个有效的方法来理解物种形成的性质。本文基于全基因组单核苷酸多态性和线粒体DNA数据，推测了西北太平洋及其边缘海同域岩鱼Steindachneriandericateswakiyai的物种形成过程。基于模型的人口统计推断表明，两个物种之间的基因流是不存在的初始和后期的分歧，目前只在中期阶段。种群扩张发生在基因流动之前或期间。最初的分歧和人口扩张的估计时间落在更新世，在此期间，目前居住的两个物种的海洋被反复隔离和重新连接。当代隔离的杂交和共享的线粒体DNA单倍型的情况下支持。我们的研究结果表明，这两个物种最初分歧的异地，其次是二次接触和渐渗和生殖隔离的完成。鉴于在海洋生物中很少测试或记录二次接触后的完全隔离，我们强调认真考虑待测试的替代分歧情景的重要性，这应考虑到地质和环境背景。
Understanding how speciation occurs is central to biology. Gene flow between diverging taxa is correlated with geography and other aspects of speciation; therefore, the examination of gene flow during divergence is a potent approach to understanding the nature of speciation. Here, we inferred the speciation process of the sympatric rockfishesSebastes steindachneriandSebastes wakiyaiin the north-western Pacific and its marginal seas based on genome-wide single nucleotide polymorphism and mitochondrial DNA data. Model-based demographic inference showed that gene flow between the two species was absent in the initial and late stages of divergence and present only in the middle stage. Population expansion occurred before or during the period of gene flow. The estimated timings of the initial divergence and population expansion fell within the Pleistocene, during which the seas currently inhabited by the two species were repeatedly isolated and reconnected. Contemporary isolation was supported by the absence of hybrids and the shared mitochondrial DNA haplotypes. Our results suggest that the two species initially diverged in allopatry, followed by secondary contact and introgression and by the completion of reproductive isolation. Given that complete isolation following secondary contact has rarely been tested or documented in marine organisms, we highlight the importance of careful consideration of alternative divergence scenarios to be tested, which should take into account the geological and environmental settings.