| 摘要: |
| 密斑马面鲀Thamnaconus tessellatus是在我国南海海域较为常见的一种马面鲀属鱼类。本研究基于线粒体DNA控制区序列对南沙群岛密斑马面鲀3个群体的遗传结构及其遗传多样性进行了分析。研究结果显示，密斑马面鲀的控制区序列变异程度较大，86尾个体序列的变异位点数为38个，共定义了28个单倍型；3个密斑马面鲀群体的单倍型多样度和核苷酸多样度均较高，且相差不大；密斑马面鲀群体间未检测到显著的群体遗传结构，分子方差分析表明，99.67%的遗传差异来自于群体内，群体间遗传差异仅为0.33%。贝叶斯树和最大似然树均显示出密斑马面鲀单倍型间松散的分布，未检测到显著的谱系结构。群体历史动态分析结果表明密斑马面鲀的群体经历了更新世的群体扩张事件。 |
| 关键词: 密斑马面鲀 南沙群岛 控制区 遗传多样性 群体遗传结构 |
| DOI：10.11693/hyhz20180300061 |
| 分类号:S931.5 |
| 基金项目:“全球变化与海气相互作用”专项，GASI-02-SCS-YSWaut/spr（南海）；国家自然科学基金项目，41776171号。 |
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| STUDIES ON POPULATION GENETIC DIVERSITY OF THAMNACONUS TESSELLATUS FROM NANSHA ISLANDS OF SOUTH CHINA SEA |
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GAO Tian-Xiang1, WANG Zhi-Yang2, SONG Na3, SONG Lin4
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1.Fishery College, Zhejiang Ocean University, Zhoushan 316022, China;2.Ocean College, Yantai University, Yantai 264005, China;3.Key Laboratory of Mariculture(Ocean University of China), Ministry of Education, Qingdao 266003, China;4.Eastern Liaoning University, Dandong 118001, China
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| Abstract: |
| Thamnaconus tessellatus is a common marine fish distributed in the South China Sea. To determine the genetic diversity of T. tessellatus, a control region segment of mitochondrial DNA was sequenced for three populations collected from the Nansha Islands. Thirty-eight polymorphic sites were detected among 86 individuals, showing a high genetic variation. These polymorphic sites defined 28 haplotypes. The three populations showed a similar high haplotype diversity and nucleotide diversity. No significant population genetic differentiation was detected among the three populations. The results show that the proportion of genetic variation was 99.67% within-populations and only 0.33% among-populations. The topology of the Bayesian inference tree and maximum likelihood tree were shallow, showing no significant genealogical branches or clusters corresponding to the sampling localities. Both mismatch distribution analysis and neutrality tests showed that T. tessellatus has experienced a recent population expansion. |
| Key words: Thamnaconus tessellatus Nansha Islands control region genetic diversity population genetic structure |
