香螺成体和8月龄幼螺形态性状对体质量性状的影响OA

Neptunea cumingii Crosse is an important gastropod with significant ecological and economic values in the northern China.However,until now,there has been no report on the correlation between morphological traits and body mass traits of N.cumingii in different periods.To select ideal indices for selective breeding of N.cumingii,98 sexually mature and 96 8-month-old immature N.cumingii were randomly selected to analyze the correlation between morphological traits and body mass traits.And 7 morphological traits including shell length(X1),shell width(X2),shell aperture length(X3),shell aperture width(X4),operculum length(X5),operculum width(X6)and shell layer length(X7),and 2 body mass traits including body weight(Y1)and soft tissue weight(Y2)of mature N.cumingii were measured.Also 7 morphological traits including,shell length(x1),shell width(x2),shell opening length(x3),shell opening width(x4),operculum length(x5),operculum width(x6)and shell layer length(x7),and 2 body mass traits including body weight(y1)and soft tissue weight(y2)of 8-month-old immature N.cumingii were measured.Then descriptive statistics analysis,correlation analysis,stepwise regression analysis,path analysis and determinant coefficient analysis were carried out to explore the breeding potential of different traits and the influence of morphological traits on body mass traits.The results showed that the coefficient of variation of body mass traits was higher than that of morphological traits,and the breeding potential was greater.Correlation analysis indicated that there were significant relationships among most of the traits(P<0.01).Path analysis and determinant coefficient analysis showed that shell width,shell length,shell apertrue width and operculum length were the main factors affecting the body weight of mature N.cumingii,with the degree of influence decreasing in order.Shell width,operculum length and shell length were the main factors affecting soft tissue weight of mature N.cumingii,and the importance decreased in turn in a descending order.For immature N.cumingii,shell width,shell length,shell apertrue length were the main factors affecting its body weight,with the degree of influence decreasing in order.Shell width was the main factor affecting soft tissue weight.Through stepwise regression analysis,the equations of morphological traits on body mass traits of mature and immature N.cumingii were as follows:Y1=-98.566+1.247X2+0.731X1+0.992X4+0.447X5(R2=0.803);Y2=-42.748+0.715X2+0.359X5+0.275X1(R2=0.629);y1=-3.232+0.141x3+0.123x2+0.049x1(R2=0.932)and y2=-1.273+0.129x2(R2=0.782).This study successfully showed that shell width was an important factor affecting body mass traits of mature and immature N.cumingii,and it should be considered in selective breeding of N.cumingii.