Campillo Luke C, Manthey Joseph D, Thomson Robert C, Hosner Peter A, Moyle Robert G
Biodiversity Institute and Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS, USA.
School of Life Sciences, University of Hawai'i - Mānoa, Honolulu, HI, USA.
Biol J Linn Soc Lond. 2020 Oct 21;131(4):814-821. doi: 10.1093/biolinnean/blaa143. eCollection 2020 Dec.
Phylogeographical studies of Philippine vertebrates have demonstrated that genetic variation is broadly partitioned by Pleistocene island aggregation. Contemporary island discontinuity is expected to influence genetic differentiation but remains relatively undocumented, perhaps because the current episode of island isolation started in relatively recent times. We investigated inter- and intra-island population structure in a Philippine endemic bird genus () to determine whether genetic differentiation has evolved during the recent period of isolation. We sequenced thousands of genome-wide restriction site associated DNA (RAD) markers from throughout the Mindanao group to assess fine-scale genetic structure across islands. Specifically, we investigated patterns of gene flow and connectivity within and between taxonomic and geographical bounds. A previous assessment of mitochondrial DNA detected deep structure between and a sister species, , but was insufficient to detect differentiation within either species. Analysis of RAD markers, however, revealed structure within between the islands of Samar/Leyte and Bohol. This genetic differentiation probably demonstrates an effect of recent geographical isolation (after the Last Glacial Maximum) on the genetic structure of Philippine avifauna. We suggest that the general lack of evidence for differentiation between recently isolated populations is a failure to detect subtle population structure owing to past genetic sampling constraints, rather than the absence of such structure.
对菲律宾脊椎动物的系统地理学研究表明，遗传变异在很大程度上是由更新世岛屿聚合划分的。当代岛屿间断性预计会影响遗传分化，但相关记录仍然相对较少，这可能是因为当前的岛屿隔离事件始于相对较近的时期。我们研究了菲律宾特有鸟类属（）的岛间和岛内种群结构，以确定在最近的隔离期内遗传分化是否已经发生演变。我们对棉兰老岛群各地数千个全基因组限制性位点相关DNA（RAD）标记进行了测序，以评估各岛屿间的精细遗传结构。具体来说，我们研究了分类学和地理界限内及之间的基因流动和连通性模式。先前对线粒体DNA的评估检测到了该物种与其姐妹物种之间的深层结构，但不足以检测任一物种内部的分化。然而，对RAD标记的分析揭示了萨马岛/莱特岛和保和岛之间该物种内部的结构。这种遗传分化可能表明最近的地理隔离（末次盛冰期之后）对菲律宾鸟类遗传结构产生了影响。我们认为，近期隔离种群之间普遍缺乏分化证据，是由于过去遗传采样限制未能检测到细微的种群结构，而非不存在这种结构。
