論文

査読有り
2012年2月

Present and past genetic connectivity of the Indo-Pacific tropical eel Anguilla bicolor

JOURNAL OF BIOGEOGRAPHY
  • Yuki Minegishi
  • ,
  • Pierre-Alexandre Gagnaire
  • ,
  • Jun Aoyama
  • ,
  • Pierre Bosc
  • ,
  • Eric Feunteun
  • ,
  • Katsumi Tsukamoto
  • ,
  • Patrick Berrebi

39
2
開始ページ
408
終了ページ
420
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1111/j.1365-2699.2011.02603.x
出版者・発行元
WILEY-BLACKWELL

Aim The objective of this study was to reveal the present population structure and infer the gene-flow history of the Indo-Pacific tropical eel Anguilla bicolor. Location The Indo-Pacific region. Methods The entire mitochondrial control region sequence and the genotypes at six microsatellite loci were analysed for 234 specimens collected from eight representative localities where two subspecies have been historically designated. In order to infer the population structure, genetic differentiation estimates, analysis of molecular variance and gene-tree reconstruction were performed. The history of migration events and population growth was assessed using neutrality tests based on allelic frequency spectrum, coalescent-based estimation of gene flow and Bayesian demographic analysis using control region sequences. Results Population structure analysis showed genetic divergence between eels from the Indian and Pacific oceans (FST = 0.0174-0.0251, P < 0.05 for microsatellites; F ST = 0.706, P < 0.001 for control region), while no significant variation was observed within each ocean. Two mitochondrial sublineages that do not coincide with geographical regions were found in the Indian Ocean clade of a gene tree. However, these two sublineages were not differentiated at the microsatellite markers. The estimation of mitochondrial gene-flow history suggested allopatric isolation between the Indian and Pacific oceans, and a possible secondary contact within the Indian Ocean after an initial population splitting. Bayesian demographic history reconstruction and neutrality tests indicated population growth in each ocean after the Indo-Pacific divergence. Main conclusions Anguilla bicolor has diverged between the Indian and Pacific oceans, which is consistent with the classical subspecies designation, but is apparently genetically homogeneous in the Indian Ocean. The analysis of geneflow and demographic history indicated that the two mitochondrial sublineages observed in the Indian Ocean probably represent the haplotype groups of relict ancestral populations. A comparison with a sympatric congener suggested that absolute physical barriers to gene flow may not be necessary for population divergence in eels.


リンク情報
DOI
https://doi.org/10.1111/j.1365-2699.2011.02603.x
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000299042000014&DestApp=WOS_CPL
ID情報
  • DOI : 10.1111/j.1365-2699.2011.02603.x
  • ISSN : 0305-0270
  • Web of Science ID : WOS:000299042000014

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