Title page for etd-0718118-141715


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URN etd-0718118-141715
Author JIEHONG WEI
Author's Email Address w443687230@163.com
Statistics This thesis had been viewed 5577 times. Download 86 times.
Department Department of Oceanography
Year 2017
Semester 2
Degree Master
Type of Document
Language English
Title Population genetics of Tridentiger barbatus along the coast of China
Date of Defense 2018-07-27
Page Count 47
Keyword
  • phylogeography
  • Tridentiger barbatus
  • population genetics
  • coastal China
  • current
  • Abstract Gene exchange of widespread marine species populations may be easily interrupted
    by various conditions in the ocean, which may result in divergences. Previous studies
    suggested that complex coastal current system, Changjiang Diluted Water and
    Pleistocene Glacial Cycle are possible factors causing divergence of marine
    organisms in Coastal China. Tridentiger barbatus is a benthic goby widely spread in
    coastal China, Korea and Japan. In this study, we collected 258 individuals of T.
    barbatus from 14 sites along the coast of China to explore its genetic structure.
    Fragments of cyt b, Rh and RAG1 from all individuals were obtained and analyzed.
    Bayesian trees and TCS network revealed two deeply divided lineages (southern
    lineage and northern lineage) in T. barbatus, distributions of the two lineages
    appeared to match summer coastal current pattern in China. It implied that currents
    may have important effect on the phylogeographic pattern of T. barbatus. Cyt b
    haplotype distributions and AMOVA showed further divisions within southern
    lineage, which may be related to currents and barriers in coastal China. Divergence
    time of the two lineages was 1.65 Mya, which may be dated back to Pleistocene
    glacial cycles. Tajima’ D and Fu’ Fs statistics were significantly negative in both
    southern and northern lineage, suggesting that the two lineages might have undergone
    sudden expansions in past. Bayesian skyline plot showed that sudden expansion times
    of southern and northern lineage were 0.010 Mya and 0.015 Mya, respectively, which
    happened at the end of the last glacial period (about 0.02 Mya). It implied that
    Pleistocene glaciation may be important to divergence and population size of T.
    barbatus.
    Advisory Committee
  • Jen-Chieh Shiao - chair
  • Min-Yun Liu - co-chair
  • Te-yu Liao - advisor
  • Files
  • etd-0718118-141715.pdf
  • Indicate in-campus at 1 year and off-campus access at 1 year.
    Date of Submission 2018-08-18

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