Effect Analysis of Morphological Traits on Body Weight of Cipangopaludina cathayensis
To explore the relationship between morphological traits and body weight of Cipangopaludina cathayensis,a total of 505 C.cathayensis were collected,and their shell width(Z1),shell height(Z2),shell mouth height(Z3),shell mouth width(Z4),body snail layer height(Z5),spiral height(Z6),the penultimate snail layer width(Z7),the penultimate snail layer height(Z8)and body weight(W)were measured.Through statistical analysis,correlation analysis,path analysis and regression analysis,the main morphological traits of C.cathayensis with greater influence on body weight were determined,and the regression equation was established.The results showed that the coefficient of variation of the body weight of C.cathayensis was 59.61％,and its breeding potential was great.The correlation coefficients of shell width,shell height,body snail layer height and the penultimate snail layer width with body weight were higher(≥0.949).Path analysis and ridge regression analysis showed that shell height had the greatest direct effect on body weight(0.963,0.152),and the direct determination coefficient was the highest(0.927).The co-determination coefficients of other traits and shell height on body weight were higher,and the total determination coefficient was 1.117.The optimal multiple regression equation of body weight and main influencing traits of C.cathayensis was established:W=-24.346+0.214Z1+0.148Z2+0.123Z3+0.306Z4+0.188Z5+0.083Z6+0.383Z7+0.882Z8,R2=0.943.The analysis of variance of the regression equation showed that the regression relationship reached a very significant level(P＜0.01).In summary,shell height is the most important trait affecting the body weight of C.cathayensis.
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