不同地理群体菲律宾蛤仔表型性状的相关性与通径分析

随机选取繁殖时期的南方群体北方养殖菲律宾蛤仔(SN)、北方土著品种(NN)和南方群体南方养殖蛤仔(SS),测量其壳长(SL)、壳高(SH)、壳宽(SW)、活体质量(mL)、软体质量(mM)和烘干后软体部干质量(mF),采用相关与通径分析方法分析不同地理群体的菲律宾蛤仔表型性状对软体质量的作用效果,为菲律宾蛤仔的选择育种提供理论依据和测度指标。试验结果表明,不同地理群体菲律宾蛤仔的形态学指标无显著差异(P>0.05);不同地理群体各数量性状之间的相关关系均达到极显著水平(P<0.01);决定系数分析表明,不同地理群体菲律宾蛤仔影响软体质量的主要表型性状并不相同,南方群体北方养殖蛤仔群体的壳宽直接作用最大,壳宽通过壳高的间接作用是次要因素;北方土著品种群体壳长是主要因素,壳长通过壳高的间接作用是次要因素;南方群体南方养殖蛤仔群体壳高的直接作用是主要因素,壳长通过壳高的间接作用是次要因素。对通径系数检验不显著的自变量进行删除,利用逐步回归的方法,建立不同地理群体菲律宾蛤仔软体质量的最优回归方程:SN群体,mM1=-4.276+0.211SH+0.116SW;NN群体,mM2=-2.806+0.088SL+0.087SH;SS群体,mM3=-3.101+0.290SH。回归方程分析表明回归关系均达到极显著水平(P<0.01)。

Correlation and Path Analysis of Phenotypic Traits in Different Geographical Groups of Manila Clam Ruditapes philippinarum

The shell length(SL), shell height(SH), shell width(SW), live body weight(mL), wet soft part weight(mM) and dry soft part weight(mF) were measured and their correlation coefficients analyzed among Manila clam Ruditapes philippinarum from southern group farming in the north(SN), northern indigenous group(NN) and southern indigenous group(SS) by correlation and path analysis to provide theoretical basis and measurement index for selection and breeding of Manila clam. It was found that the correlation coefficients between each shell morphological trait and mL or mM were all very significant in different geographical groups of Manila clam(P<0.01), even though there was no significant difference in morphological indices among different geographical groups of the clam(P>0.05). The analysis of determinant coefficient showed that the main phenotypic traits affecting WM were not the same among different geographical groups, with the maximal direct effect of SW, and the secondary indirect effect of SW through SH in SN population;SL being the main factor through SH in NN population;the main direct effect of SH, and the indirect effect of SL through SH in SS population.The independent variables with inconspicuous test of the path coefficient were deleted, and the optimal regression equation of the mM of the clams was established by using the stepwise regression method: SN group mM1=-4.276+0.211SH+0.116SW;NN group mM2=-2.806+0.088SL+0.087SH;SS group mM3=-3.101+0.290SH.