【作者】 陈蔚涛； 钟再选； 戴炜； 范启； 何舜平；

【Author】 CHEN Weitao;ZHONG Zaixuan;DAI Wei;FAN Qi;HE Shunping;Institute of Hydrobiology, Chinese Academy of Sciences;Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences;

【机构】 中国科学院水生生物研究所中国科学院； 珠江水产研究所中国水产科学研究院；

【摘要】 分布较广的物种往往形成了多个进化谱系,因此经常被看作是隐存种。本研究中,我们利用线粒体细胞色素b基因(Cytb)和12个核基因来研究我国南部水系?的谱系地理结构以及探讨地质历史和气候环境是如何影响其遗传多样性和进化历史的。基于Cytb的系统发育分析发现,我国南部水系的?群体包含有了三个谱系(A,B,C)。谱系A和B的分布区较为狭窄,而谱系C在许多河流水系均有分布。分歧时间估算表明这三个谱系的分化介于1.61–2.38百万年前(Ma),这与青藏高原的快速隆升、东亚季风的演化、古水系的变迁以及?较差的游泳扩散能离息息相关。基于12个核基因的贝叶斯物种界定分析表明这三个进化谱系可能代表了三个有效的物种。种群动态历史分析表明谱系B和C分别在0.03 Ma和0.08 Ma经历了种群的近期扩张,然而气候环境的波动并未对谱系A产生显著的影响。更多还原

【Abstract】 Species with broad distributions frequently divide into multiple genetic forms and may therefore be viewed as "cryptic species". Here, we used the mitochondrial cytochrome b(Cytb) and 12 nuclear DNA loci to investigate phylogeographic structures of the sharpbelly(Hemiculter leucisculus) in rivers in southern China and explored how the geological and climatic factors have shaped the genetic diversity and evolutionary history of this species. Our mitochondrial phylogenetic analysis identified three major lineages(lineages A, B, and C). Lineages B and C showed a relatively narrower geographic distribution, whereas lineage A was widely distributed in numerous drainages. Divergence dates suggested that H. leucisculus populations diverged between 1.61–2.38 Ma, which might correspond to intense uplift of the Qinghai–Tibetan Plateau, evolution of Asian monsoons, changes in paleodrainages, and poor dispersal ability. Bayesian species delimitation analysis using 12 nuclear DNA loci indicated the three lineages probably represented three valid taxa. Demographic analyses showed that lineages B and C have experienced rapid demographic expansion at 0.03 Ma and 0.08 Ma, respectively, whereas climatic fluctuations exerted little influence on the lineage A.更多还原