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濒危鱼类稀有白甲鱼沅江种群与西江种群形态度量学性状的差异性

代应贵**,岳晓烔,尹邦一   

  1. (贵州大学动物科学学院, 贵阳 550025)
  • 出版日期:2013-03-10 发布日期:2013-03-10

Morphometrics differences between the populations of endangered species Onychostoma rara from Yuanjiang River and Xijiang River systems, Southwest China.

DAI Ying-gui**, YUE Xiao-tong, YIN Bang-yi   

  1. (College of Animal Sciences, Guizhou University, Guiyang 550025, China)
  • Online:2013-03-10 Published:2013-03-10

摘要: 分别以采自沅江水系142例和西江水系92例稀有白甲鱼标本为材料,采用差异系数法、方差分析法、判别分析法和主成分分析法,研究了稀有白甲鱼沅江种群、西江种群包括10个可数性状和31个比例性状等形态度量学性状的差异性。方差分析表明,2个种群之间共有6个可数性状和27个比例性状存在着显著性差异(P<0.05)。判别分析筛选出了9个对区分2个种群贡献较大的比例性状,并建立了2个种群的判别函数式。主成分分析显示,稀有白甲鱼种群鱼体沿背腹轴、头尾轴分别有16和6个比例性状表现出了明显的变化,在尾部有2个比例性状差异明显。可见2个种群之间形态度量学性状已显示了明显的分化。这可能是两个种群长期隔离,在不同水系生态环境中产生了适应性进化的结果。然而,差异系数的计算结果表明,两个种群之间形态度量学性状的差异尚未达到亚种分化的水平。

关键词: 林窗, 马尾松人工林, 土壤团聚体, 有机碳, 活性有机碳

Abstract: By the methods of coefficient of difference, variance analysis, discriminant analysis, and principal component analysis (PCA), this paper studied the morphometrics differences, including 10 countable characteristics and 31 proportional characteristics, between the 142 and 92 specimens of endangered species Onychostoma rara collected from the Yuanjiang River and Xijiang River systems, respectively. The variance analysis showed that a total of 6 countable characteristics and 27 proportional characteristics had significant differences between the populations of O. rara from the Yuanjiang River and the Xijiang River systems, respectively (P<0.05). The discriminant analysis revealed that there were 9 proportional characteristics being important to differentiate the two populations from each other, and the discriminant functions for the two populations were established, respectively. Based on the results of PCA, there were 16 proportional characteristics along the dorsalventral axis, 6 proportional characteristics along the anteriorposterior axis, and 2 proportional characteristics along the caudal peduncle of fish body among the individuals of O. rara presenting obvious differences. As a result, the morphometrics of the two populations had shown obvious differentiation, probably due to the longterm segregation of the two populations and their adaptive evolution in different river systems. However, the coefficient of difference demonstrated that the morphometrics differences between the two populations were still under subspecies level.

Key words: forest gap, P. massoniana plantation, soil aggregates, organic carbon, labile organic carbon.