中国似鮈属鱼类的形态变异及地理分化研究
MORPHOLOGICAL VARIATIONS AND GEOGRAPHICAL DIFFERENTIATION OF THE GENUSPSEUDOGOBIO(TELEOSTEI: CYPRINIDAE)IN CHINA
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摘要: 对似鮈属鱼类进行了形态测量和主成分分析。结果表明区别似鮈和桂林似鮈的重要特征胸鳍末端是否超过腹鳍起点与尾柄高同尾柄长的比例相互之间有一定的相关性,但是在研究的样本中没有截然的界限,而是有较大的重叠,难以区分。其他的特征则没有相关性。从地理分布看,同一地点的样本在上述特征上有一定的区别,但是没有发现明显的南北或东西地理变化的规律。因此似鮈属鱼类应该只划分为一个种,桂林似鮈为似鮈的同物异名。Abstract: In the present paper, 14 characters were measured and analyzed by means of principle component analysis method to 131 specimens belonging to the genus Pseudogobio. The results showed that the diagnostic characters between P. guilinensis and P. vaillanti, such as end of pectoral fin over or not reach ventral origin, ratio between length and depth of caudal peduncle, are correlated. However, specimens can not be distinguished definitely according to these differences because of the overlap in characters. There are differences among populations from different localities but no correlations to north-south or east-west geographical differentiations can be found. Based on these results, Pseudogobio species in China was being suggested as only one species and P. guilinensis as a synonym of P. vaillanti.
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Keywords:
- Pseudogobio /
- Principle component analysis /
- Morphological variations
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