Patterns of species range evolution in Indo-Pacific reef assemblages reveal the Coral Triangle as a net source of transoceanic diversity.
Patterns of species range evolution in Indo-Pacific reef assemblages reveal the Coral Triangle as a net source of transoceanic diversity.
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DOI：
10.1098/rsbl.2016.0090
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发表时间：
2016-06
期刊：
影响因子：
3.3
通讯作者：
Genner MJ
中科院分区：
文献类型：
--
作者：
Evans SM;McKenna C;Simpson SD;Tournois J;Genner MJ
印度-太平洋珊瑚三角区是一个以卓越的海洋生物多样性而闻名的地区。该地区本可以充当物种丰富的“起源中心”，也可以在海平面变化等重大环境变化期间提供庇护所，从而充当“生存中心”。由于该地区位于印度洋和太平洋之间的中心位置，因此也可能成为珊瑚三角区以外物种的“积累中心”。在这里，我们使用基于种群水平 DNA 序列的重建，对 45 个印度-太平洋珊瑚礁相关生物物种（314 个种群）的范围进化进行了研究，以研究对这些假设的支持。我们的结果表明，经历最古老的定居的人群更有可能更接近珊瑚三角的中心，而不是外围地区。这些数据与珊瑚三角区是印度-太平洋地区珊瑚礁生物多样性的净来源相一致，表明该地区主要充当生存中心、起源中心或两者兼而有之。这些结果提供了证据，证明关键位置如何影响进化时间尺度上生物多样性的大规模分布。
The Coral Triangle in the Indo-Pacific is a region renowned for exceptional marine biodiversity. The area could have acted as a ‘centre of origin’ where speciation has been prolific or a ‘centre of survival’ by providing refuge during major environmental shifts such as sea-level changes. The region could also have acted as a ‘centre of accumulation’ for species with origins outside of the Coral Triangle, owing to it being at a central position between the Indian and Pacific oceans. Here, we investigated support for these hypotheses using population-level DNA sequence-based reconstructions of the range evolution of 45 species (314 populations) of Indo-Pacific reef-associated organisms. Our results show that populations undergoing the most ancient establishment were significantly more likely to be closer to the centre of the Coral Triangle than to peripheral locations. The data are consistent with the Coral Triangle being a net source of coral-reef biodiversity for the Indo-Pacific region, suggesting that the region has acted primarily as a centre of survival, a centre of origin or both. These results provide evidence of how a key location can influence the large-scale distributions of biodiversity over evolutionary timescales.