Little Genetic Differences between Korean and Japanese Populations in Songbirds(Part Two Natural History Studies)

スポンサーリンク

概要

• 論文の詳細を見る

• In order to get general view of historical relationship between Korean and Japanese populations of passerine birds, we investigated genetic divergence between the two populations in ten species; six resident species, three migratory species and one species (Cettia diphone) resident in Honshu Island of Japan and insular regions of Korea but migrant in continental Korea. Four of the six resident species (Hypsipetes amaurotis, Lanius bucephalus, Zosterops japonicus, and Passer montanus) and one of the three migratory species (Urosphena squameiceps) share the same subspecies between Korea and Honshu Island of Japan. The other two resident species (Aegithalos caudatus and Emberiza cioides), two migrant species (Acrocephalus orientalis and Locustella pleskei) and Cettia diphone show morphological difference between Korea and Honshu including adjacent islands. We analyzed complete sequences (1143-1146bp) of cytochrome b region on mitochondrial DNA which is assumed to have regular substitution rates, 2%/million years, for all short-lived birds like passerines. The intra-populational genetic difference within Japan is larger than that within Korea for 7 of 10 compared cases and the reverse is for only one case in Locustella pleskei. This suggests that intra-populational genetic variations in Japan might generally be larger than those in Korea for passerines. All six resident species have no or little genetic difference between Korean and Japanese populations. Even for both the resident species with regional difference at subspecies level, Aegithalos caudatus and Emberiza cioides, there are no genetic differences between Korea and Honshu, suggesting these subspecies of residents have diverged recently, maybe within tens of thousands years. The migratory species sharing the same subspecies between the two regions exhibit no or little genetic differences, but the two migrants with morphological difference exhibit genetic differences, of which divergence time is estimated at 0.1 and 0.6 million years ago for Acrocephalus orientalis and Locustella pleskei, respectively. This suggests no or little gene flow at least for these tens of thousands years. For Cettia diphone Japanese subspecies C. d. cantans is much smaller in body size than the continental counterpart C. d. borealis and some taxonomists divide these as different species. The genetic difference was 2.3% estimated 1.2 million years division, which is much higher than those in the other nine species. These indicate the positive relationship between morphological and genetic divergence in migratory birds. The phylogenetic relationships between Korean and Japanese populations for most bird species are likely much closer than what had been supposed before, but for some migrant species the divergence time is likely to be older than 150,000 years ago, when Honshu Island connected the continent the last time.

著者

• Nishiumi Isao

  Department Of Zoology National Science Museum

• Kim Chang-hoe

  Department Of Biodiversity Research National Institute Of Environmental Research

関連論文

• The functional anatomy of the masticatory muscles of the Malayan pangolin, Manis javanica
• BREEDING STRATEGY OF THE MALE BUSH WARBLER(Behavior Biology and Ecology,Abstracts of papers presented at the 74^ Annual Meeting of the Zoological Society of Japan)
• BREEDING STRATEGY OF MALE BUSH WARBLERS : MICROSATELLITE POLYMORPHISM ANALYSIS
• Comparison on Morphology and Genes of Oriental Great Reed Warblers in Thailand and Japan
• Little Genetic Differences between Korean and Japanese Populations in Songbirds(Part Two Natural History Studies)

スポンサーリンク