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Page 151
Authors
俞丹
刘焕章
唐琼英
李小兵
Publication date
1 January 2016
Publisher
Abstract
通过分析76尾来自长江上游干流宜宾(14尾)、合江(30尾)及支流赤水河(32尾)蛇(Saurogobio dabryi)种群的线粒体细胞色素b(Cyt b)基因序列,研究蛇3个地理种群的遗传多样性及种群历史。用于分析的Cyt b序列长1 097 bp,含变异位点28个,其中简约信息位点18个。76尾个体共检测到26个单倍型,整体呈现较高的单倍型多样性(Hd=0.872)和较低的核苷酸多样性(Pi=0.004 0)。三个种群共享较多的单倍型。基于单倍型构建的系统发育树及NETWORK网络关系图显示:所有来自长江上游干流和赤水河的单倍型不能按照地理分布各自聚类,而是相互混杂聚在一起;网络关系图呈星状分布,未检测到原始单倍型和进化中心。此外,基于单倍型频率分析得到的三个种群间的遗传分化指数FST值较低(分别为﹣0.0293、0.0280和0.0258)。分子方差分析(AMOVA)显示,整体上长江上游干流及赤水河蛇种群变异主要来源于种群内,种群内的变异占总变异的80.00%,表明长江上游干流及赤水河蛇种群属于同一种群,蛇各地理种群间基因交流频繁。中性检验、错配分析及BSP(Bayesian skyline plot)分析显示,整体上长江干流及赤水河蛇种群在距今0~0.025 Ma(百万年)期间发生过种群扩张现象
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Institute of Hydrobiology, Chinese Academy Of Sciences
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oai:ir.ihb.ac.cn:342005/41730
Last time updated on 23/01/2021
USC Digital Library
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oai:digitallibrary.usc.edu:p15...
Last time updated on 18/11/2016