长牡蛎壳橙品系形态性状与体质量的相关及通径分析

Multiple Regression and Path Analysis of Morphological and Weight Traits of Pacific Oyster(Crassostrea gigas) Orange-Shell Strain

为研究长牡蛎(Crassostrea gigas)壳橙品系的壳形态性状对体质量性状的影响。本实验随机选取144只二龄壳橙品系长牡蛎为研究对象,测量了壳高(XH)、壳长(XL)、壳宽(XW)、活体总重(YL)和软体部重(YS),以壳形态性状(XH,XL,XW)为自变量,体质量性状(YL,YS)为因变量进行了相关分析、通径分析和多元回归分析。相关分析结果表明,所测量的长牡蛎橙色品系各性状间均呈极显著的表型相关(P<0.01)。通径分析结果表明,壳形态性状对活体总重直接影响依次为壳高(0.477)>壳宽(0.336)>壳长(0.326),壳高对活体总重的直接决定系数最大(0.228),是影响活体总重的主要因素;然而,软体部重的相关系数R2<0.850,表明可能还存在对软体部重影响较大的其他因素。通过多元回归分析,建立了壳形态性状对体质量性状的最优回归方程。

To evaluate the effect of shell morphological traits on weight traits in the orange-shell strain of Pacific oyster Crassostrea gigas,shell height（XH）,shell length（XL）,shell width（XW）,live body weight（YL）and soft tissue weight（YS）were measured for 144 individuals of two-year-old orange-shell strain of Pacific oyster.Morphological traits（XH,XLand XW）were used as independent variables and weight traits（YL,YS）as dependent variables for path coefficient and multiple regression analyses.Correlation indices showed that the direct effects of correlation coefficient between each shell morphological traits（XH,XLand XW）and weight traits（YLand YS）were all significantly different（P〈0.01）.In path analysis,the direct effects of the shell morphological traits on live body weight were in order of shell height（0.477）shell length（0.336）shell width（0.326）.Shell height had the maximum direct effect（0.228）on the live body weight,and was the key influencing factor.However,the correlation indices（R2）of morphological traits against the edible tissue weight was less than 0.85,indicating that some other factors might associate with the edible tissue weight.The optimum multiple regression equations were also obtained through stepwise multiple regression analysis.