锦鲤和龙凤鲤的形态差异分析

Analysis of morphological variations between Koi carp and Longfeng carp

采用t检验、主成分分析和判别分析等方法对锦鲤和龙凤鲤的7项形态性状参数进行比较分析。t检验结果显示,两组仅在体长(BL)这一个指标上的差异达到极显著水平(P <0.01),其他指标不存在显著差异(P>0.05)。主成分分析构建了3个主成分,主成分1的贡献率为41.51%,主成分2的贡献率为18.62%,主成分3的贡献率为15.46%,累积贡献率为75.59%。对锦鲤和龙凤鲤这两个群体的7项形态指标进行多元判别分析的综合判别率为98.80%。分析结果显示,锦鲤和龙凤鲤在体长、头长和尾柄高这三个形态指标上存在差异。

Three kinds of multivariate analysis methods including T-test, principal component and discriminant analysis were used to study seven morphological proportional traits of Koi and Longfeng. The results of T-test showed that the differences between the two groups in the BL index were extremely significant(p<0.01), and there was no significant difference in other indicators(p>0.05), which was consistent with the results of the morphological indicators. Principal component analysis distinguished out principal components with the contribution of 41.51%, 18.62%, 15.46%, respectively, cumulatively to 5.59%. The comprehensive discriminant rate of multivariate discriminant analysis was 98.80 % for seve morphological indexes of Koi and Longfeng carp. The analysis results showed that there are differences in the three morphological indicators of body length, head length, and tail shank height between Koi and Longfeng carp.