华南沿海地区西部入海水系中间黄颡鱼的形态变异及地理分化
Morphological Variations and Geographical Differentiations of Pelteobagrus intermedius in Different Drainage Systems from the Coastal Area of Western South China
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摘要: 为探讨不同水系中间黄颡鱼 (Pelteobagrus intermedius) 的形态差异及地理分化问题，采用形态学方法, 测量12个水系中间黄颡鱼150尾样本的18个形态性状，进行主成分分析。其结果显示，前3个主成分累积贡献率为58.918%，并可将这12个水系的群体分为3簇。华南沿海地区西部诸独立入海小水系中的中间黄颡鱼群体与海南岛群体之间的相似性大于与西江干流群体的相似性。防城港地区3条直接入海的小水系的群体在形态特征上已发生了一定程度的分化，其分化主要表现在吻、眼和尾的变异。Abstract: One hundred and fifty specimens of Pelteobagrus intermedius from 12 drainage systems were collected to measure 21 morphometric characters using traditional taxonomic methods. Data on the morphometric characters were analyzed using principal component analysis in order to discuss the morphological variation and geographical differentiation of the characters. The populations of the 12 drainage systems are divided into three clusters by the first three principal components, which express 58.918% of the cumulative variance. The populations of P.intermedius from the coastal area of western South China were more closelyrelated to the populations of Hainan Island than to the populations of the Xijiang River. In addition, distinct differences were shown in the populations from the three small drainage systems of Fangchenggang. The main morphological differences between populations were related to the snout, eyes and tail.
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