Evans Ben J, Tosi Anthony J, Zeng Kai, Dushoff Jonathan, Corvelo André, Melnick Don J
Biology Department, Life Sciences Building Room 328, McMaster University, 1280 Main Street West, Hamilton, ON, Canada L8S4K1.
Department of Ecology, Evolution, and Environmental Biology, Columbia University, 10th floor Schermerhorn Extension, 119th Street and Amsterdam Avenue, New York, NY 10027, USA.
R Soc Open Sci. 2017 Oct 18;4(10):170351. doi: 10.1098/rsos.170351. eCollection 2017 Oct.
Many genera of terrestrial vertebrates diversified exclusively on one or the other side of Wallace's Line, which lies between Borneo and Sulawesi islands in Southeast Asia, and demarcates one of the sharpest biogeographic transition zones in the world. Macaque monkeys are unusual among vertebrate genera in that they are distributed on both sides of Wallace's Line, raising the question of whether dispersal across this barrier was an evolutionary one-off or a more protracted exchange-and if the latter, what were the genomic consequences. To explore the nature of speciation over the edge of this biogeographic divide, we used genomic data to test for evidence of gene flow between macaque species across Wallace's Line after macaques colonized Sulawesi. We recovered evidence of post-colonization gene flow, most prominently on the X chromosome. These results are consistent with the proposal that gene flow is a pervasive component of speciation-even when barriers to gene flow seem almost insurmountable.
许多陆生脊椎动物类群仅在华莱士线一侧或另一侧实现了多样化，华莱士线位于东南亚的婆罗洲和苏拉威西岛之间，划分出世界上最明显的生物地理过渡带之一。猕猴属在脊椎动物类群中很不寻常，因为它们分布在华莱士线两侧，这就引发了一个问题：跨越这一屏障的扩散是一次性的进化事件，还是更持久的交流——如果是后者，其基因组后果是什么。为了探究在这个生物地理分界线边缘的物种形成本质，我们利用基因组数据来检验猕猴在殖民苏拉威西岛后，跨华莱士线的猕猴物种之间基因流动的证据。我们发现了殖民后基因流动的证据，最显著的是在X染色体上。这些结果与基因流动是物种形成普遍组成部分的观点一致——即使基因流动的障碍似乎几乎无法逾越。
