两种壳色文蛤壳形态性状对活体质量的影响

为了解文蛤Meretrix meretrix壳形态性状对活体质量的影响,获得具有优良遗传性状的群体,以经过7年群体选育的F_4代黑斑文蛤和红色文蛤为试验对象,采用相关性分析、主成分分析和通径分析等统计方法,对两种文蛤进行了壳长(X_1)、壳高(X_2)、壳宽(X_3)对活体质量(Y)的影响分析,建立了壳形态性状对活体质量影响的最优回归方程。结果表明:两种文蛤表型性状差异不大(P0.05),但壳性状对活体质量的主要影响因子不同,壳高和壳宽是决定黑斑文蛤活体质量的主要因素,而壳长是决定红色文蛤活体质量的主要因素(P0.01);多元逐步回归分析得到最优回归方程Y_(黑斑)=-8.308+0.361X_2+0.391X_3,Y_(红色)=-8.389+0.500X_1,回归关系和偏回归系数均达极显著水平(P0.01)。本研究结果对生产实践中两种文蛤的选育具有较高的参考价值。

Effect of morphological traits on live body weight in clam Meretrix meretrix with two kind color shells

In the present study, shell length (X1), shell width (X2), shell height (X3) and body weight (Y) were measured and effects of shell morphological traits on body weight were analyzed statistically using correlation a-nalysis, PCA ( Principal Component Analysis) and path analysis in black blotching and red color strains of the 7 year selective F4 clam Meretrix meretrix to obtain hereditary excellent population of the clam by the optimal multi-regression equation between shell morphological traits and body weight. It was found that there was no significant difference in phenotypic traits in the two clam strains (P>0. 05). However, there were different main shell mor-phological traits affecting body weight in the two tested strains of clam, shell height and shell width being the major factors affecting body weight in black blotching strain and shell length being the major factors affecting body weight in red color strain (P<0. 01). The optimal multi-regression equation was expressed as Y=-8. 308+0. 361X2+0. 391X3 in black blotching clam and Y=-8. 389+0. 500X1 in red color clam. The findings will contribute to genet-ic selection breeding of the clam in production practice.