不同养殖群体虾夷扇贝数量性状的相关性与通径分析

Correlation and path analysis of quantitative traits in different cultured populations of yesso scallop Patinopecten yessoensis

对不同养殖群体虾夷扇贝Patinopecten yessoensis各数量性状间的相关性及影响体质量的因素进行了分析,随机选取山东牟平、山东莱州、大连广鹿岛、大连獐子岛4个养殖群体的虾夷扇贝共计287枚,测量其壳长(x1)、壳宽(x2)、壳高(x3)、活体质量(y)和放射肋数(x4)等指标,比较分析了4个虾夷扇贝养殖群体数量性状对活体质量的影响及不同群体间的形态差异;采用相关性分析和通径分析法分析了4个虾夷扇贝群体间各数量性状与活体质量的关系,建立了各群体数量性状的回归方程。相关性分析结果表明,4个虾夷扇贝群体的壳长、壳宽、壳高对活体质量的相关系数为0.727～0.988,均达到极显著水平(P<0.01);通径分析结果表明,牟平、莱州、广鹿岛、獐子岛4个群体的壳高对活体质量的直接作用均最大,分别为0.526、0.422、0.485和0.632,说明壳高是影响4个虾夷扇贝群体活体质量的主要因素;獐子岛群体的壳长对活体质量的间接作用最大,而其他3个群体均是壳宽对活体质量的间接作用最大,说明不同群体之间出现了差异;采用逐步回归方法,建立了4个虾夷扇贝养殖群体活体质量的最优回归方程分别为y牟平=-94.540+0.565x1+1.491x2+0.968x3,y莱州=-158.247+0.996x1+1.469x2+0.804x3,y广鹿岛=-110.501+0.710x1+0.629x2+0.861x3+0.321x4,y獐子岛=-187.897+0.397x1+2.064x2+2.556x3+0.118x4,回归关系均达到了极显著水平(P<0.01)。研究表明,不同养殖群体虾夷扇贝的形态存在显著差异。

Morphometrical traits including shell length （x1 ）, shell height（x2 ）, shell width（ x3 ）, radial rib number （x4 ） and live body weight （y） were measured and analyzed in 287 individuals randomly sampled from Shandong Muping （M） , Shandong Laizhou （L） , Dalian Guanglu Island （G） , and Dalian Zhangzi Island （ Z ） populations of two-year-old yesso scallop Patinopectert yessoensis by correlation analysis, path analysis, and multiple regression a- nalysis in order to clarify the correlation among the quantitative traits and the factors influencing body weight of the scallop. The results showed that there were significant correlations among the shell length, shell height, shell width and live body weight, with the correlation coefficient of 0.727-0. 988, and very significant level （P〈0.01）. The path analysis showed that the maximal correlation coefficient was found between the shell height and body weight, 0. 526 in Shandong Muping population, 0. 422 in Shandong Laizhou population, 0.485 in Dalian Guanglu Island population, and 0. 632 in Dalian Zhangzi Island population. The Zhangzi Island population had the maximal indirect effects of shell length on the body weight, but the other three populations showed the maximal indirect effects of shell width on the body weight, indicating that there were differences in the factors affecting the correlation coeffi- cient among the 4 populations. Using stepwise regression method, the regression equations between body weight traits and other quantitative traits were expressed as at very significant level （P〈0.01） ：YM = -94. 540＋0 565xl ＋ 1. 491x2 ＋0. 968x3, YL = - 158. 247 ＋0. 996Xl ＋ 1. 469X2 ＋0. 804X3, YG = -- 110. 501 ＋0. 710xi ＋0. 629x2 ＋0. 861x3 ＋ 0. 321X4, yz=--187. 897＋0. 397x1＋2. 064Xx＋2. 556X3＋0. 118x4. The findings indicates that there exit significant differences in morphology in different populations.