叉斑狗母鱼形态性状的相关性及通径分析

为了研究叉斑狗母鱼(Synodus macrops)各形态性状的相关性及对体重的影响,随机选取叉斑狗母鱼150尾,测定体长(X1)、体宽(X2)、体高(X3)、头长(X4)和体重(Y)共5个性状.通过相关分析和通径分析方法对所测数据进行分析.结果表明:叉斑狗母鱼4个性状与体重的相关关系达到极显著水平(P＜0.01)；体长、体宽和体高对体重的通径系数达到了极显著的水平,它们是影响体重的主要指标,其中体长对体重的直接作用最大,其次为体高、体宽；头长通过间接作用影响体重；决定系数分析结果与通径分析结果基本一致.剔除对体重直接作用不显著的性状,建立体长(X1)、体宽(X2)、体高(X3)对体重的多元回归方程:Y=-50.198+0.299X+0.695X2+ 1.238X3(R2=0.930).

Correlation and Path Analysis of Morphometric Attributes of Synodus macrops

In order to research the correlation of morphometric attributes of Synodus macrops and the effects on the body weight, 150 Synodus macrops were collected and the attributes including body length (X1), body width (X2), body depth (X3), head length (X4) and weight (Y) were measured and analyzed by correlation analysis and path analysis. The results showed that, all correlation coefficients between morphometric attributes and weight achieved very significant difference (P<0.01). The path coefficient of body length (X1), body width (X2), body depth (X3) to the body weight all achieved significant level (P<0.01). These morphometric attributes were the most important determination to body weight. Among them body length had the largest direct effect on body weight, and body depth and body width ranked in order. The head length affected body weight indirectly. The diversification of decision coefficients analysis was consisted with the path analysis. Eliminating the head length which had no significantly direct effect on body weight, the multiple regression equation was constructed: Y=-50.198+0.299X1+0.695X2+1.238X3 (R2=0.930).