Evidence of introgression, ecological divergence and adaptation in Asterias sea stars
Evidence of introgression, ecological divergence and adaptation in Asterias sea stars
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DOI：
10.1111/mec.17118
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发表时间：
2023-09
影响因子：
4.9
通讯作者：
Melina Giakoumis;G. Pinilla‐Buitrago;Lukas J. Musher;J. Wares;S. J. Baird;M. Hickerson
中科院分区：
文献类型：
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作者：
Melina Giakoumis;G. Pinilla‐Buitrago;Lukas J. Musher;J. Wares;S. J. Baird;M. Hickerson
杂交区是了解种群进化动力学的重要窗口，揭示了基因渗入和适应等过程如何构成种群基因组变异。重要的是，它们有助于理解物种形成以及物种如何对环境做出反应。在这里，我们调查了两个密切相关的海星星物种，Asterias rubens和A。forbesi，分布沿着北大西洋的岩石欧洲和北美海岸线，并使用全基因组分子标记来推断该组物种内和物种之间的基因组变异分布。利用基因组数据和环境生态位建模，我们记录杂交发生在北方新英格兰和加拿大南部的海洋。我们调查的因素，保持这种杂交区，以及环境变量，puperness驱动选择内和物种之间。结果表明，这两个物种的环境生态位宽度不同，虎斑海盘车的环境生态位宽度相对较窄，而虎斑海盘车的环境生态位宽度相对较窄。鲁本斯的利基市场更广阔。物种分布模型准确地预测杂交发生在环境生态位重叠，从而表明环境选择在杂交区的维持中起着重要作用。我们的研究结果表明，北大西洋海星的基因组变异的分布受到环境的影响，这将是至关重要的考虑气候变化。
Hybrid zones are important windows into the evolutionary dynamics of populations, revealing how processes like introgression and adaptation structure population genomic variation. Importantly, they are useful for understanding speciation and how species respond to their environments. Here, we investigate two closely related sea star species, Asterias rubens and A. forbesi, distributed along rocky European and North American coastlines of the North Atlantic, and use genome‐wide molecular markers to infer the distribution of genomic variation within and between species in this group. Using genomic data and environmental niche modelling, we document hybridization occurring between northern New England and the southern Canadian Maritimes. We investigate the factors that maintain this hybrid zone, as well as the environmental variables that putatively drive selection within and between species. We find that the two species differ in their environmental niche breadth; Asterias forbesi displays a relatively narrow environmental niche while conversely, A. rubens has a wider niche breadth. Species distribution models accurately predict hybrids to occur within environmental niche overlap, thereby suggesting environmental selection plays an important role in the maintenance of the hybrid zone. Our results imply that the distribution of genomic variation in North Atlantic sea stars is influenced by the environment, which will be crucial to consider as the climate changes.