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Title: Population demographic history of a temperate shrub, Rhododendron weyrichii (Ericaceae), on continental islands of Japan and South Korea
Authors: Yoichi, Watanabe
Tamaki, Ichiro
Sakaguchi, Shota  kyouindb  KAKEN_id  orcid (unconfirmed)
Song, Jong-Suk
Yamamoto, Shin-ichi
Tomaru, Nobuhiro
Author's alias: 阪口, 翔太
Keywords: ecological niche modeling
historical vicariance
island biogeography
isolation with migration model
population demography
Issue Date: 21-Nov-2016
Publisher: Wiley-Blackwell
Journal title: Ecology and Evolution
Volume: 6
Issue: 24
Start page: 8800
End page: 8810
Abstract: Continental islands provide opportunities for testing the effects of isolation and migration on genetic variation in plant populations. In characteristic of continental islands is that the geographic connections between these islands, which are currently distinguished by seaways, have experienced fluctuations caused by sea-level changes due to climate oscillations during the Quaternary. Plant populations on the islands have migrated between these islands via the exposed seafloors or been isolated. Here, we examined the demographic history of a temperate shrub, Rhododendron weyrichii, which is distributed in the southwestern parts of the Japanese archipelago and on an island of South Korea, using statistical phylogeographic approaches based on the DNA sequences of two chloroplast and eight nuclear loci in samples analyzed from 18 populations on eight continental islands, and palaeodistribution modeling. Time estimates for four island populations indicate that the durations of vicariance history are different between these populations, and these events have continued since the last glacial or may have predated the last glacial. The constancy or expansion of population sizes on the Japanese islands, and in contrast a bottleneck in population size on the Korean island Jeju, suggests that these islands may have provided different conditions for sustaining populations. The result of palaeodistribution modeling indicates that the longitudinal range of the species as a whole has not changed greatly since the last glacial maximum. These results indicate that exposed seafloors during the glacial period formed both effective and ineffective migration corridors. These findings may shed light on the effects of seafloor exposure on the migration of plants distributed across continental islands.
Rights: © 2016 The Authors. Ecology and Evolution. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
DOI(Published Version): 10.1002/ece3.2576
PubMed ID: 28035270
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