不同群体毛蚶形态性状对重量性状的影响效果分析

Effects of shell morphological traits on the weight traits of Scapharca subcrenata Lischke in different populations

随机选取滨州港和连云港两个不同地理群体2龄毛蚶(Scapharca subcrenata Lischke)各300 ind,分别测定其壳长、壳高、壳宽、体重和软体重5个性状参数,计算各性状间的相关系数,以及以壳性状为自变量对重量性状为因变量的通径系数、决定系数及相关指数,并建立回归方程。结果表明,两群体毛蚶壳性状与体重和软体重的相关系数均达到极显著水平(P<0.01);滨州港群体中壳宽对体重、软体重的直接影响最大,通径系数分别为0.659、0.461,是影响体重、软体重的主要因素。连云港群体中壳宽对体重的直接影响最大,通径系数为0.527,是影响体重的主要因素,影响软体重的主要因素是壳长,其通径系数为0.575;经多元回归分析,剔除不显著性状,建立了形态性状对重量性状的最优回归方程:滨州港群体Y=-8.013+0.073X1+0.152X2+0.508X3、Z=-1.463+0.030X1+0.027X2+0.061X3,连云港群体Y=-7.261+0.095X1+0.202X2+0.369X3、Z=-1.569+0.066X1+0.047X3,为毛蚶的遗传育种提供了理论依据和测度指标。

300 2-year-old Scapharca subcrenata Lischke samples were randomly selected from Binzhougang and Lianyungang respectively. The shell length （ X1 ）, shell height （ X2 ）, shell width （ X3 ）, body weight （Y） and soft-tissue weight （Z） were measured. The correlation coefficient matrix was calculated. The preceding three shell morphological traits were used as independent variables, and the weight traits were used as a dependent variable for path analysis, path coefficients （ Pi ）, determination coefficients （ di ） and correlation index （R2） were calculated. Results showed that the shell morphological traits and body weight or soft-tissue weight of two different populations were extremely significantly different （P 〈0.01 ）. By path analysis, shell width had the greatest direct effect on body weight and soft-tissue weight（0. 659,0. 461 ）, and were the key influencing factors for Binzhougang population; shell width had the greatest direct effect on body weight （0. 527）, and was the key influencing factor, shell length had the greatest direct effect on soft-tissue weight and was the key influencing factor for Lianyungang population. The multiple regression equations were obtained to estimate body weight and soft-tissue weight as：1 ） For Binzhougang population： Y = -8. 013 ＋ 0.073X1 ＋0. 152X2 ＋0. 508X3,Z = - 1. 463 ＋ 0. 030X1 ＋ 0. 027X2 ＋ 0. 061X3; 2） For Lianyungang population： Y = -7. 261 ＋ 0.095X1 ＋ 0.202X2 ＋ 0.369X3,Z= -1.569 ＋ 0.066X1 ＋ 0.047X3.The current study may contribute to the artificial breeding of S. subcrenata Lischke.