7月龄方斑东风螺形态性状对体质量的通径分析

Path analysis of the effects of morphometric attributes on the body weight of 7-month-old Babylonia areolata

为探明方斑东风螺(Babylonia areolata)形态性状对体质量的影响程度,对7月龄方斑东风螺的体质量(Y)和11个(X_1-X_(11))形态性状进行了测量。结果显示,7月龄方斑东风螺体质量与各形态性状间呈正相关,相关系数均达到极显著水平(P<0.01);通径分析发现壳宽(X_2)对体质量的直接作用最大(0.373),其次为体螺层高(X_7)、壳口高(X_3),而次螺层宽(X_(10))主要通过X_2、X_3及X_7间接影响体质量;决定系数分析显示,这4个性状对体质量的共同决定系数之和为0.852,说明体质量主要受这些性状的影响;经多元回归分析,建立了7月龄方斑东风螺形态性状对体质量的回归方程。将回归方程中的X_2、X_3、X_7和X_(10)等4个形态性状与体质量分别进行模型拟合,最优拟合模型分别为:Y=0.0034X_2^(2.5128),Y=0.0034X_3^(2.4349),Y=0.0015X_7^(2.5967),Y=-6.4964+1.3293X_(10)。

This study analyzed the relationship between 11 morphometric attributes(X1–X11)and the body weight(Y)of 7-month-old Babylonia areolata.The results showed highly significantly positive correlations between morphometric attributes and body weight(P<0.01).The path analysis revealed that X2 displayed the highest positive direct effect(0.373)on body weight,followed by X7 and X3.X10 showed an indirect effect on body weight through X2,X3,and X7.The results of analysis of the determination coefficients revealed the total decision coefficient of four morphological attributes affecting body weight to be 0.852,indicating that these morphological attributes are the primary factors affecting body weight.Multiple regression equations established using multiple regression analysis revealed that all the morphometric attributes are the best models for the 7-month-old B.areolata,including Y=0.0034X2 2.5128,Y=0.0034X3 2.4349,Y=0.0015X7 2.5967,and Y=–6.4964+1.3293X10.