虾夷马粪海胆壳性状对活体质量的影响效果分析

Effects of Shell Size Characters on Live Weight in Sea Urchin Strongylocentrotus intermedius

选择66只13月龄虾夷马粪海胆,测定其体积、壳径、壳高、活体质量,计算相关系数,用通径分析方法计算其他性状对活体质量作为依变量的通径系数、决定系数以及相关指数。试验结果表明,虾夷马粪海胆体积、壳径、壳高、活体质量的相关系数均达到极显著水平(P<0.01),壳径对活体质量的直接影响(0.778)最大,是影响活体质量的主要因素;体积与活体质量的相关程度很大,但是对活体质量的直接影响最小(0.098)。通径系数分析后剔除不显著自变量(体积)后,计算壳径、壳高对活体质量的复相关指数为R2=0.8978,多元回归分析建立了壳径、壳高估计活体质量的回归方程:y=-21.78+1.035x1+0.

The correlation coefficients were measured and calculated among shell volume（x1）,test diameter（x2）,shell height（x3）,and the live body weight（y）in 66 samples of sea urchin Strongylocentrotus intermedius during 13 months.The results showed that 3 correlation coefficients between each shell character and the live body weight were all very significant differences（P〈0.01）.The test diameter（x2）showed predominant effect（P2=0.778）on the live body weight.The shell volume（x1）gave slightly direct effect and indirect effect on the live body weight.Depended on the check on path analysis,shell volume（x1）had no significant in multiple regression equation.It was clear from the results of high correlation index（R2=0.8978）that the truthful relationship between the independent variables（x2 and x3）and the dependent variable（Y）was revealed by the path coefficient analysis.The multiple regression equation to estimate live body weight as y=-21.78＋1.035x1＋0.188x2.This paper provides theoretical evidence and perfect measure target for breeding of sea urchins.