摘要
对团头鲂的3个种质资源区(梁子湖、鄱阳湖和淤泥湖)群体的可量性状和可数性状进行了多元统计分析。对可数性状的方差分析结果表明,3个团头鲂群体在侧线鳞数、侧线上鳞数、侧线下鳞数、胸鳍鳍条数以及臀鳍鳍条数上存在显著性差异;以体长作为协变量对可量性状进行的协方差分析显示,3个团头鲂群体在全长、体高、头长、头宽、尾柄长、尾柄高、背前区长和腹鳍前长存在显著性差异。对可量性状建立判别函数以及对可量性状平均值进行聚类分析表明梁子湖团头鲂与鄱阳湖团头鲂在外部形态上更为相似。主成分分析构建了3个主成分,其贡献率分别为39.78%、22.63%和6.53%,累计贡献率为68.95%。多元统计分析显示梁子湖群体和淤泥湖群体之间的形态差异最大,而梁子湖和鄱阳湖的比较相似。通过计算变异系数,根据Mayr等提出的75%规则,认为它们的形态差异是种内不同地理种群的差异。
Blunt snout bream （Megalobrama amblycephala ） is a widespread and one of the main aquaculture species in China. In present study, through univariate and multivariate analysis, we compared the external morphology of M. amblycephala from three different locations （Liangzi, Poyang and Yuni Lake）. The results from one-way ANOVA and one-way analysis of covariance showed significant differ- ences （P〈0. 05） in all the morphological parameters among the three populations, except for DRC, CRC,HD, DL, AL, PRPD and ND. We observed two discriminant functions among M. arnblycephala from three lakes and these were more accurate between Yuni and Liangzi populations. In the principal component analysis （PCA）, three principal components were constructed and the related contribution ra- tios were 39. 78%, 22. 63 % and 6.53%,respectively,with the cumulative contribution ratio of 68. 95 %. The multivariate analysis indicated that morphological variation between Liangzi and Yuni populations was greater, while Liangzi and Poyang populations were more similar in morphology. According to Mayr＇s 75% rule,the differences among these three populations were still within the population level.
出处
《华中农业大学学报》
CAS
CSCD
北大核心
2012年第1期88-94,共7页
Journal of Huazhong Agricultural University
基金
现代农业产业技术体系建设专项(CARS-46-05)
中央高校基本科研业务费专项资金(2011PY023)
关键词
团头鲂
种群
形态学
多元分析
梁子湖
鄱阳湖
淤泥湖
Megalobrama amblycephala
populations
external morphology
multivariate analy
