不同贝龄毛蚶壳形态性状对体质量的影响

选取毛蚶(Scapharca subcrenata Lischke)1龄、2龄和3龄个体各100粒,分别测量壳长、壳高和壳宽等壳形态性状,并称其体质量,采用多元分析的方法分析了各表型性状间的相关性,以及壳形态性状对体质量的影响效果。结果表明,各性状间呈正相关,且达到极显著水平(P0.001);通径分析与决定程度分析的结果相似,不同贝龄期影响毛蚶体质量的主要因素是不同的,壳长是影响1龄毛蚶体质量的主要因素,壳长和壳宽是影响2龄毛蚶体质量的主要因素,且两者的共同决定系数最大(0.244),壳宽是影响3龄毛蚶体质量的主要因素,其与壳高的共同决定系数最大(0.230)。

The relationship between morphometric traits and body weight of Scapharca subcrenata at different ages

To study the difference in morphological traits of Scapharca subcrenata Lischke at different ages, samples were collected at 1, 2 and 3 years. The shell length, shell height, shell width and the live body weight were measured individually. The correlation between the phenotypic data and the body weight, the direct and indirect effect of body size on body weight were analyzed by correlation analysis and path analysis, and then the regression equation was established. The results showed that there is a significant positive correlation among the 4 traits (P< 0.001). The path analysis and the determination coefficient of morphological traits to body weight showed a similar trend. The effect of morphometric traits on body weight was different at different ages. The shell length had major effects on the body weight at one year old. The shell length and shell width had major effects on the body weight at two years old, while their total coefficient of determination was the biggest (0.244). The shell width had major effects on the body weight at three years old, and the total coefficient for the shell width and shell height was the biggest (0.230).