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Phylogeography of the Endangered Species, Sinogastromyzon puliensis (Cypriniformes: Balitoridae), in Southwestern Taiwan Based on mtDNA
並列摘要
The initial colonization by Sinogastromyzon puliensis is hypothesized to be in southern Taiwan, followed by its northward dispersal. To unravel its phylogeographical history, the mitochondrial control regions of S. puliensis were sequenced. Hierarchical analysis of molecular variance (AMOVA) revealed that more genetic variation resided among populations (ΦST=0.879, p=0) than within populations (ΦSC=0.871, p=0), as supported by significant pairwise F(subscript ST) values showing high genetic differentiation and rare migrations among populations. High levels of genetic differentiation can be explained by either long-term isolation among populations or a consequence due to the founder effect. Both a Neighbor-joining (NJ) tree and maximum parsimony (MP) analysis divided 4 populations of S. puliensis into 3 major groups. Group I is composed of populations of the Wu and Choshui Rivers, in which reciprocal monophyly was not supported. The Tzengwen River, comprising group Ⅱ, is sister to group Ⅰ. Group Ⅲ is the basal clade and consisted of only the Kaoping River in a phylogram rooted by S. wui. According to the topological pattern and character of haplotypes without a 16-bp deletion, the Kaoping River is proposed to be the first habitat colonized by the ancestor of S. puliensis, after which this fish dispersed northwards. This dispersal pattern is concordant with the previously proposed hypothesis.
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延伸閱讀
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