Mitochondrial control region variability of baiji and the Yangtze finless porpoises, two sympatric small cetaceans in the Yangtze river
Mitochondrial control region variability of baiji and the Yangtze finless porpoises, two sympatric small cetaceans in the Yangtze river
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DOI：
10.1007/bf03192493
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发表时间：
2003-12
影响因子：
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通讯作者：
Guang Yang;Sha Liu;Wenhua Ren;K. Zhou;F. Wei
中科院分区：
文献类型：
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作者：
Guang Yang;Sha Liu;Wenhua Ren;K. Zhou;F. Wei
白暨豚（米勒，1918）和长江江豚（Neophocaena phocaenoides asiaeorientalis，Pilleri and Gihr，1972）是生活在长江中下游的两种同域小型鲸类。本研究对江豚线粒体控制区420-428 bp片段进行了测序，首次比较研究了这两种濒危江豚的遗传变异和种群结构，并对来自黄渤海、东海和南海的江豚样本进行了比较研究。两种江豚的单倍型多样性和核苷酸多样性都很低，尤其是白鳍豚和长江及南海江豚。分子方差分析（AMOVA）结果表明，中国沃茨3个江豚种群的遗传结构总体水平较高，其中长江种群和黄海种群与南海种群的遗传结构差异最大。长江和黄海种群间的遗传分化不显著，雄性个体的遗传分化高于雌性个体，表明两种群间存在明显的雌性偏向扩散现象。这项研究表明，长江江豚，不像同域白暨豚，是不是一个遗传隔离的群体。长江江豚和黄海江豚应该被纳入同一管理单元，但迫切需要使用更多样本，特别是基于更多分子标记的进一步研究来证实这一点。
BaijiLipotes vexillifer(Miller, 1918) and the Yangtze finless porpoiseNeophocaena phocaenoides asiaeorientalis(Pilleri and Gihr, 1972) are two sympatric small cetaceans inhabiting the middle and lower reaches of the Yangtze River. In this study, a fragment (420–428 bp) of the mitochondrial control region was sequenced to provide the first comparative survey of genetic variability and population structure in these two endangered species, with samples of finless porpoises from the Yellow/Bohai Sea, East China Sea, and South China Sea also included. Low values of haplotype diversity and nucleotide diversity were found for both species, especially for the baiji and the Yangtze River and South China Sea populations of finless porpoises. The analysis of molecular variance (AMOVA) supported a high level of overall genetic structure among three porpoise populations in Chinese waters, with greatest differences found between either the Yangtze River population or the Yellow Sea population and the South China Sea population. The differentiation between the Yangtze and Yellow Sea populations was not significant, and the males have higher genetic differentiation than the females, suggesting a significant female-biased dispersal between these two populations. This study showed that the Yangtze finless porpoise, unlike the sympatric baiji, was not a genetically isolated population. The Yangtze and Yellow Sea porpoises should be included in the same management unit, but further studies using more samples and especially based on more molecular markers are urgently needed to confirm this.