金钱鱼雌雄个体的形态差异分析

通过对2011-2013年采集的178尾金钱鱼形态学性状的测定,并进行主成分分析和R-聚类分析,建立了金钱鱼雌雄判别方程。对11项标准化比例性状进行主成分分析和R-聚类分析均得出,金钱鱼雌雄个体差异主要集中在头部特征和形体特征等方面。利用逐步判别法从11个标准化比例性状中筛选出吻长/头长、眼间距/头长、体宽/体长、体高/体长、头高/体长5个性状,建立性别判别方程,并将采集样品数据代入方程重新鉴定,其准确率为85.96%。经t检验,除体宽/体长和眼间距/头长外,其他3个标准化性状在金钱鱼两性群体间差异显著(P0.05),表明雌性个体相比于雄性具有体形较高、头较大且吻较长的特征。

Analysis of morphological index and discrimination of male and female Scatophagus argus

In this study, we analyzed morphological characteristics for 178 individuals of Scatophagus argus collected from 2011 to 2013. Based on the analysis of the morphological index system and R-cluster analysis, the results indicated that S.argus could be classified by "body size"and "head feature". On the basis of this analysis, 11 characteristics were normalized and further used for stepwise discrimintion. Five characteristics were selected: snout length/head length, eye distance/head length, body breadth/body length, body depth/body length and head depth/body length.Thus the sex discriminant equation was built for classifying 178 samples and the accuracy rate was 85.96%. T-test showed that three standardized characteristics between male and female populations were significantly different (P<0.05), except for eye distance/head length and body breadth/body length. Therefore, we concluded that female S.argus were superior to males in the respects of body depth, head and snout length.