单 位：
中国水产科学研究院长江水产研究所;西藏自治区农牧科学院水产科学研究所
关键词：
黑斑原;形态差异;环境差异;生存压力;基因交流
摘 要：
黑斑原(Glyptosternum maculatum)是中国唯一的原属鱼类,在中国仅分布于西藏雅鲁藏布江。为了解黑斑原两个野生群体间是否存在形态差异及差异分化的程度,对雅鲁藏布江支流尼洋河及干流日喀则拉孜江段的样本进行了形态学测量,共测量了10项常规可量性状和19项框架结构性状。结果表明,独立样本T检验显示林芝群体与日喀则群体在外部形态特征上存在差异。主成分分析结果显示日喀则群体的形态特征多样性高于林芝群体,两江段的黑斑原只根据形态特征难以完全分开;且形态差异呈现多元化现象,所测性状不足以概括两个群体间的形态差异。差异检测结果显示两个群体的表观形态差异未达到亚种的水平。环境差异及生存压力的不同可能是导致两个群体形态差异分化的主要原因,而之前群体间广泛的基因交流可能抑制了这种分化。
译 名：
Morphological variations between two wild groups of Glyptosternum maculatum in Tibet
作 者：
PAN Yingzi;LIU Haiping;ZHU Tingbing;Institute of Fishery Sciences, Tibet Academy of Agricultural and Animal Husbandry Sciences;Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture and Rural Affairs;Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences;
关键词：
Glyptosternum maculatum;;morphological variations;;environmental difference;;survival pressure;;gene exchange
摘 要：
Glyptosternum maculatum is the only endemic fish that belongs to Glyptosternum in China. It is only distributed in the Yarlung Zangbo River in Tibet. To determine the existence of morphological variations and the degree of differentiation between two wild groups, fish from the Nyang River, a tributary of the Yarlung Zangbo River and Shigatse river section, a main stream, were evaluated. Here, 10 morphological parameters and 19 structural parameters were assessed. The results were as follows: the independent sample t-test revealed differences in external morphological characteristics between the Nyingchi and Shigatse groups. Principal component analysis revealed that the diversity of morphological characteristics in the Shigatse group was higher than that in the Nyingchi group, and it was difficult to completely separate the two groups based on morphological characteristics alone. Moreover, the morphological differences in the Shigatse group were diverse, and the measured traits were insufficient to summarize the morphological differences between the two groups. The difference coefficient showed that the apparent morphological differences between the two groups did not reach the subspecies level.Environmental differences and different survival pressures may be the main causes of morphological differentiation between the two groups, which may have been inhibited by extensive gene exchange between previous groups.
