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中文摘要：
针对多鳞四指马鲅（Eleutheronema rhadinum）群体分布广泛，种群结构不明等突出问题，本实验分别采集了来自江苏东部海域（QD）、广东湛江附近海域（ZJ）、上海崇明附近海域（CM）、海南琼海附近海域（QH）4个地理群体共计144个样本，借助多变量形态度量学方法对4个地理群体的形态变异进行了研究，为多鳞四指马鲅不同地理群体结构研究提供资料。本文对144个样本数据校正后进行聚类分析、主成分分析和判别分析比较了4个群体间的形态差异。聚类结果表明，4个群体分为两支，CM和QD群体欧式距离最为接近，聚为一类；ZJ和QH群体聚为一类。CM、QD群体和ZJ、QH群体亲缘关系较远。主成分分析结果显示，可量数据和框架数据共计32项形态参数中，后背部和头部特征对各群体间的差异贡献率最大。运用判别分析建立4个群体的判别函数，其综合判别准确率为87.4%。分析结果显示多鳞四指马鲅4个地理群体在形态上已产生了一定程度的差异。
英文摘要：
Total 144 samples of Eleutheronema rhadinum species were collected from the Yellow Sea, the East China Sea and the South China Sea. Due to the widespread and ambiguous population structure of Eleutheronema rhadinum species, three multivariate analysis methods were used to comparably investigate the morphological variation of the species. By the cluster analysis, it showed the highest morphological similarity between species of Chongming and species of Qidong, also between species of Zhanjiang and Qionghai. In the principal component analysis of 32 characters of general and frame morphology, variations in the area between head and back account for the largest contribution ratio. Subsequent discrimination functions were established by means of stepwise discrimination method, with the general prediction accuracy of 87.4%. Our study revealed that variation emerged in these four geographical species.
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