福寿螺表型性状的相关性及2种壳色福寿螺表型性状的差异性分析

为对福寿螺进行形态学及生态学的研究,在广东省内6个地点采集福寿螺样本737只,其中黑色螺411只,黄色螺326只,分别测量螺壳宽、螺壳高、体螺层高、体螺层宽、壳口长、壳口宽、活体质量等表型性状指标,用SPSS 18软件对各表型性状之间的相关性进行分析,并比较2种壳色福寿螺的表型性状差异.结果表明:以上7个性状两两间的相关系数均达到极显著水平(P<0.01),其中体螺层宽对活体质量影响最大,螺壳高次之,壳口宽对活体质量影响最小;采用逐步回归分析法建立以螺壳高(X1)、壳口宽(X2)、体螺层高(X3)、体螺层宽(X4)、螺壳宽(X5)、壳口长(X6)为自变量,活体质量(Y)为因变量的最优回归方程为:Y=-10.377+0.180X1-0.188X2+0.189X3+0.289X4+0.137X5-0.092X6;差异性分析结果为:黄色螺的螺壳高、螺壳宽、壳口宽、活体质量显著大于黑色螺,其他指标差异不显著.

Correlation and Difference Analysis to Phenotype Characters for Two Kinds of Pomacea canaliculata

737 Pomacea canaliculata were collected from different places of Guangdong, among which black and yellow strains were 411 and 326 respectively. The shell width, shell length, shell height, body whorl height, body whorl width, shell mouth length, shell mouth width and live body mass were measured. The correlation among the 7 traits and phenotypic differences between the two types of P.canaliculata were analyzed by SPSS 18. The results revealed that phenotype correlation coefficients among traits were significant(P<0.01). Body whorl width had a maximum impact on the body mass, followed by conch height, shell width had minimal impact to bady mass. Regression equation between mass of live body(Y) and morphological traits of shell height(X₁), and shell mouth width(X₂),body whorl height(X₃), and body whorl width(X₄),shell width(X₅),shell mouth length(X₆) was established using stepwise regression analysis. The equation was as follows: Y =-10.377+0.180X₁-0.188X₂+0.189X₃+0.289X₄+0.137X₅-0.092X₆. The yellow P.canaliculata were much bigger than the black ones in terms of shell height, shell width, shell mouth width and live body mass, but there was no significant difference in other phenotype characters.