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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/45594

Title: Mutilocus approach reveals cryptic lineages in the goby Rhinogobius duospilus in Hong Kong streams: role of paleodrainage systems in the shaping marked population differentiation in a city.
Authors: Tsz Huen Wu;Ling Ming Tsang;I-Shiung Chen;Ka Hou Chu
Contributors: 國立臺灣海洋大學:生命科學系
Date: 2016
Issue Date: 2018-03-28T01:43:51Z
Publisher: Molecular Phylogenetics and Evolution
Abstract: Abstract: Drainage history is a well-demonstrated factor that influences the population structure of freshwater inhabitants over a broad geographic scale. However, there has been little research undertaken on such a relationship with freshwater fish on a small geographical scale, especially in Asia. In this study, we investigated the role of local, small drainage systems in affecting the population genetic structure of a freshwater goby, Rhinogobius duospilus, in Hong Kong streams using a multilocus approach. Analyses on nine genetic markers (2 mitochondrial and 7 nuclear markers, including 5 microsatellite markers) reveal prominent and intensive genetic structuring (2.1–5.4% mtDNA sequence divergence) in R. duospilus in Hong Kong. The lineages and clusters recovered from mtDNA data and assignment analysis of nuclear markers coincide with the paleodrainage networks. Furthermore, marked population subdivision between streams located on different side branches (<20 km apart) within the same paleodrainage area is observed and gene flow occurs only between closely situated streams that share common paleodrainage confluences. In an extreme case, gene flow is limited between streams that are less than 5 km apart. Apparently, such an intensive population structure is attributed to the regional paleodrainage pattern, together with the highly sedentary life style of R. duospilus, which reduces contemporary gene flow and dispersal between populations in neighbouring streams.
Relation: 104
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/45594
Appears in Collections:[生命科學系] 期刊論文

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