Reduced genetic variation in the Japanese giant salamander, Andrias japonicus (Amphibia: Caudata)
Reduced genetic variation in the Japanese giant salamander, Andrias japonicus (Amphibia: Caudata)
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DOI：
10.1016/j.ympev.2008.07.020
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发表时间：
2008-10-01
影响因子：
4.1
通讯作者：
Tanaka-Ueno, Tomoko
中科院分区：
文献类型：
--
作者：
Matsui, Masafumi;Tominaga, Atsushi;Tanaka-Ueno, Tomoko
本文对日本大鲵27个居群46个样本与其同源大鲵A.利用线粒体基因NADH 1、NADH 3、cyt B和CR、部分NADH 6和间插基因的3664 bp序列，对中国大鲵（davidianus）进行了研究。在MP，ML和贝叶斯方法构建的系统发育树中，隐鳃科和Andrias属都形成单系群。日本A.中国A.大鲵是姐妹分类群，尽管遗传分化程度很小，但可被视为独立的物种。Andrias brilliant分为中部和西部分支，但后者分支内的系统发育关系尚未解决。等位酶分析结果表明，A.与分布重叠的小鲵属蝾螈形成强烈对比的是，小鲵几乎没有遗传差异。这降低了A.其原因包括一夫多妻制、性成熟延迟、寿命长、生活在稳定的水生环境中、以及栖息地破碎和第四纪冰川期当地种群灭绝后的瓶颈效应。因此，该物种很容易因潜在的环境波动而灭绝，需要采取广泛的保护措施。(C)2008年爱思唯尔公司All rights reserved.
The phylogenetic relationships among 46 samples from 27 populations of the Japanese giant salamander, Andrias japonicus and its congener, A. davidianus from China was investigated, using 3664 bp sequences of the mitochondrial genes NADH1, NADH3, cyt b and CR, partial NADH6 and intervening genes. In phylogenetic trees constructed by MP, ML, and Bayesian methods, the family Cryptobranchidae and the genus Andrias both form monophyletic groups. Japanese A. japonicus and Chinese A. davidianus are sister taxa and can be regarded as separate species despite a small degree of genetic differentiation. Andrias japonicus is divided into central and western clades, but the phylogenetic relationships within the latter clade are unresolved. As peviously reported from allozyme analyses A. japonicus exhibits little genetic differrention, in strong contrast to salamanders of the genus Hynobius with which their distributions overlap. This reduced genetic variability in A. japonicus is attributable to a unique mating system of polygyny, delayed sexual maturity, notable longevity, life in a stable aquatic environment, and gigantism, as well as bottleneck effects following habitat fragmentation and extinction of local populations during Quaternary glaciations. The species is thus susceptible to extinction by potential environmental fluctuations, and requires extensive conservation measures. (C) 2008 Elsevier Inc. All rights reserved.