Extraordinarily rapid life-history divergence between Cryptasterina sea star species
Extraordinarily rapid life-history divergence between Cryptasterina sea star species
复制标题
Cryptasterina 海星物种之间的生活史差异非常快
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
R. Toonen
中科院分区：
文献类型：
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作者：
Jonathan B. Puritz;Carson C. Keever;J. Addison;M. Byrne;M. Hart;R. Grosberg;R. Toonen
生活史在控制基因流动和适应等微观进化过程以及物种形成等宏观进化过程中起着至关重要的作用。在这里，我们使用多基因座的地理分析，以研究一个物种形成事件，涉及壮观的生活史的海星姐妹物种之间的差异。隐翅虫已经进化出一套衍生的生活史特征（包括内部自受精和育雏保护），不同于它的姐妹物种隐翅虫pentagona，一个gonochoric广播产卵。我们发现，这些物种只有大约6000年的生殖隔离（95%的最高后验密度为905-22 628），这种生活史的变化可能是负责戏剧性的遗传后果，包括低核苷酸多样性，零杂合性和无基因流。这些物种的快速分化排除了一些隔离机制，如适应小生境的同域性，或在长期隔离过程中遗传漂变的缓慢分化。我们假设，物种之间的大的表型差异相对于短的分歧时间表明，观察到的生活史差异可能是人口之间的破坏性选择的直接反应。我们推测，南部山脉边缘的局部环境或人口差异可能是选择驱动已知最快的海洋物种形成事件之一的机制。
Life history plays a critical role in governing microevolutionary processes such as gene flow and adaptation, as well as macroevolutionary processes such speciation. Here, we use multilocus phylogeographic analyses to examine a speciation event involving spectacular life-history differences between sister species of sea stars. Cryptasterina hystera has evolved a suite of derived life-history traits (including internal self-fertilization and brood protection) that differ from its sister species Cryptasterina pentagona, a gonochoric broadcast spawner. We show that these species have only been reproductively isolated for approximately 6000 years (95% highest posterior density of 905–22 628), and that this life-history change may be responsible for dramatic genetic consequences, including low nucleotide diversity, zero heterozygosity and no gene flow. The rapid divergence of these species rules out some mechanisms of isolation such as adaptation to microhabitats in sympatry, or slow divergence by genetic drift during prolonged isolation. We hypothesize that the large phenotypic differences between species relative to the short divergence time suggests that the life-history differences observed may be direct responses to disruptive selection between populations. We speculate that local environmental or demographic differences at the southern range margin are possible mechanisms of selection driving one of the fastest known marine speciation events.
影响因子：
10.7
作者：
Hey, Jody
通讯作者：
Hey, Jody
影响因子：
10.7
作者：
Hey, Jody
通讯作者：
Hey, Jody