摘要
对2种不同地理种群七带石斑鱼进行14项形态性状的测定,采用2种多元统计分析方法和t-检验方法,比较了2个群体的外部形态特征。t-检验结果表明,2群体在14个性状中有12个性状表现出极其显著差异(P<0.01),1个性状表现出差异显著(P<0.05)。主成分分析构建了3个反映形态特征信息的综合性指标——主成分1、主成分2和主成分3,三者的贡献率分别为29.873%、25.091%和16.875%,三个主成分的累积贡献率为71.804%,2群体之间存在明显的偏离态势,形成两个不同的类群,2群体在主成分1轴上的差异较在主成分2轴上的差异更为明显,主成分1主要由经t-检验差异指标数量多和差异程度大的性状组成。判别分析表明,2个七带石斑鱼群体的形态差异显著(P<0.0001),建立了2个群体的判别函数,其判别准确率及综合判别率均为100%,可以认为逐步判别法对七带石斑鱼不同群体的初步鉴定是可行的。差异系数(C.D)计算的结果表明,尽管2群体在形态上存在一定的差异,但尚未达到亚种水平。主成分分析、t-检验和判别分析的结论基本上是类似的,它们从不同的角度反映了群体间的形态学差异。
Morphologic comparison between two different populations of Epinephelus septemfasciatus from Japan and south Korea was conducted with 14 morphological indices using statistics methods. The results of t-test indicate that 12 of 14 morphological indices were significantly different （P〈0.01） between the two populations. Principal component analysis revealed three principal components, contributing 29.87%, 25.09% and 16.88%, respectively, and reaching cumulatively 71.80%. Therefore, the morphological variations between the two populations are significant, and come mainly from the first principal component. The results of discriminant analysis revealed also a significant difference between the two populations （P〈0.0001）. Two discriminant functions were obtained; the identification accuracy and the total discriminant accuracy were all 100%, which shows that it is feasible to adopt stepwise discriminatory analysis to distinguish the two populations. In this study, all the results have revealed some morphological differences between the two populations. However, almost all the morphological indices were not different enough to feature a subspecies. In addition, the result of discriminant analysis agrees with that of principal component analysis and t-test, leading to the same conclusion.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
2008年第6期655-660,共6页
Oceanologia Et Limnologia Sinica
基金
国家高技术研究发展计划(863计划)项目资助,2006AA10A414号
农业部948项目,2008-Z8号
关键词
七带石斑鱼
野生群体
形态学差异
分析
Sevenband grouper Epinephelus septemfasciatus, Wild populations, Morphological difference,Analysis
