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俞丹, 张智, 张健, 林鹏程, 熊淑蓉, 唐芬莲, 刘焕章. 基于Cyt b基因的雅鲁藏布江下游墨脱江段及察隅河墨脱裂腹鱼的遗传多样性及种群历史动态分析[J]. 水生生物学报, 2019, 43(5): 923-930. DOI: 10.7541/2019.109
引用本文: 俞丹, 张智, 张健, 林鹏程, 熊淑蓉, 唐芬莲, 刘焕章. 基于Cyt b基因的雅鲁藏布江下游墨脱江段及察隅河墨脱裂腹鱼的遗传多样性及种群历史动态分析[J]. 水生生物学报, 2019, 43(5): 923-930. DOI: 10.7541/2019.109
YU Dan, ZHANG Zhi, ZHANG Jian, LIN Peng-Cheng, XIONG Shu-Rong, TANG Fen-Lian, LIU Huan-Zhang. GENETIC DIVERSITY AND POPULATION DEMOGRAPHY OF SCHIZOTHORAX MOLESWORTHI FROM THE MOTUO AREA OF LOWER REACHES OF THE YARLUNG ZANGBO RIVER AND LOHIT RIVER[J]. ACTA HYDROBIOLOGICA SINICA, 2019, 43(5): 923-930. DOI: 10.7541/2019.109
Citation: YU Dan, ZHANG Zhi, ZHANG Jian, LIN Peng-Cheng, XIONG Shu-Rong, TANG Fen-Lian, LIU Huan-Zhang. GENETIC DIVERSITY AND POPULATION DEMOGRAPHY OF SCHIZOTHORAX MOLESWORTHI FROM THE MOTUO AREA OF LOWER REACHES OF THE YARLUNG ZANGBO RIVER AND LOHIT RIVER[J]. ACTA HYDROBIOLOGICA SINICA, 2019, 43(5): 923-930. DOI: 10.7541/2019.109

基于Cyt b基因的雅鲁藏布江下游墨脱江段及察隅河墨脱裂腹鱼的遗传多样性及种群历史动态分析

GENETIC DIVERSITY AND POPULATION DEMOGRAPHY OF SCHIZOTHORAX MOLESWORTHI FROM THE MOTUO AREA OF LOWER REACHES OF THE YARLUNG ZANGBO RIVER AND LOHIT RIVER

  • 摘要: 以线粒体Cyt b基因为分子标记, 对雅鲁藏布江下游墨脱江段及察隅河的墨脱裂腹鱼进行遗传多样性及种群历史动态分析。结果显示, 167尾墨脱裂腹鱼样本共检测到21个单倍型, 呈现较高的单倍型多样性(h=0.768)和较低的核苷酸多样性(π=0.00167)。基于单倍型构建的分子系统发育树及Network网络关系图表明, 所有来自墨脱江段及察隅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。不同地理种群间的遗传分化指数(FST)为–0.014—0.771, 其中金珠藏布(JZZB)与其他种群呈现出高度分化(FST: 0.372—0.771)。分子方差分析(AMOVA)显示当JZZB种群为一组, 剩余6个种群为一组时, 组间遗传差异最大, 表明JZZB种群与其他种群具有显著分化。相反, 虽然察隅河与墨脱江段的地理距离较远, 但是察隅河与墨脱江段其他种群之间(除了JZZB)的FST为0.093—0.169, 仅显示中等分化水平, 表明察隅河种群与雅鲁藏布江种群尚有少量的基因交流。中性检验、错配分析及BSP (Bayesian skyline plot)分析显示, 雅鲁藏布江下游墨脱江段及察隅河的墨脱裂腹鱼种群在末次间冰期(0—0.137 Ma)发生过种群扩张现象。

     

    Abstract: The Yarlung Zangbo River (the upper Brahmaputa River) is the largest river on the Tibetan Plateau. The present study investigated the genetic diversity and population demography of Schizothorax molesworthi from the Motuo area of lower reaches of the Yarlung Zangbo River and Lohit River using mitochondrial DNA Cyt b gene sequences. The results showed that 21 haplotypes were identified for 167 individuals with relatively high haplotype diversity (h= 0.768) and low nucleotide diversity (π=0.00167). Phylogenetic trees and Network diagram based on haplotypes indicated all haplotypes from the lower reaches of the Yarlung Zangbo River and Lohit River were not clustered separately but mixed with each other according to the geographical distribution. Pairwise comparisons of genetic diffe-rentiation index (FST) among different populations ranged from –0.014 to 0.771 with highly significant genetic differentiations between the JZZB population and other populations (FST: 0.372—0.771). The analysis of molecular variance (AMOVA) showed that the largest mean FCT index was found between JZZB population and the group of other six populations. Neutral test, mismatch analysis and BSP (Bayesian skyline plot) analysis showed that overall S. molesworthi population from the lower reaches of the Yarlung Zangbo River and Lohit River experienced population expansion during the last glaciations BP (0—0.137 Ma).

     

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