Population genetic structure in the endemic cyprinid fish Microphysogobio alticorpus in Taiwan: Evidence for a new phylogeographical area |
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| Institution: | 1. Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan;2. Hawaii Institute of Marine Biology, University of Hawaii, Kaneohe, HI 96744, USA;3. Department of Biology, Skidmore College, Saratoga Springs, NY 12866, USA;1. Institute for Environmental Sciences, University Koblenz-Landau, 76829 Landau, Germany;2. Laboratori d''Ictiologia Genètica, Facultat de Ciències-UdG, Campus de Montilivi s/n., E-17071 Girona, Spain;1. Department of Epidemiology and Health Statistics, College of Public Health, Zhengzhou University, Zhengzhou 450001, People''s Republic of China;2. Military Hospital of Henan Province, Zhengzhou 450003, People''s Republic of China;3. Shenzhen University School of Medicine, Shenzhen 518060, People''s Republic of China;4. Department of Traditional Chinese Medicine Prevention, Preventive Medicine Research Evaluation Center, Henan University of Traditional Chinese Medicine, Zhengzhou 450008, People''s Republic of China |
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| Abstract: | The Formosa Bank is a significant zoogeographical barrier for the freshwater fish in Southern Taiwan. Here, we present population genetic structure analyses on Microphysogobio alticorpus populations in Taiwan, and biogeographic pattern to infer the relationship between historic dispersal geological dynamics. A total of 24 haplotypes were genotyped for mitochondrial CR + cyt b region in 134 specimens collected from 9 populations. Relatively high levels of haplotype diversity (h = 0.896) and low levels of nucleotide diversity (π = 0.005) were detected in M. alticorpus. Two major phylogenetic haplotype groups, Clade N1+N2 and S, were revealed and estimated to diverge about 0.121 myr (million years) ago. Haplotype network and population genetic analyses indicated significant genetic structure (FST = 0.876), largely concordant with the geographical location of the populations. According to SAMOVA analysis, M. alticorpus populations were divided into five units that can be explained by episodes of dispersal and population expansion followed by population fragmentation and restricted gene flow. The results of the topological pattern and network suggested that the Kaoping River was the first habitat colonized by the ancestor of M. alticorpus, before the northward dispersal. |
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| Keywords: | Mitochondrial DNA Phylogeography Vicariance |
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