几何形态学方法区分短吻鲾地方种群的研究

Identifying Leiognathus brevirostris stocks by geometric morphometrics

运用传统形态测量方法和地标点方法对广东阳江和湛江两个短吻鲾的形态特征进行了分析。传统测量方法的主成分分析的前两个主成分(76.29%)能明显地区分出两个种群。相对扭曲主成分分析前3个主成分(64.03%)也能明显地区分出两个种群,但效果差于传统方法的主成分分析。网格变形图显示,两地短吻鲾的形态差异主要表现在头部。地标点法避免了传统的多变量形态测量方法的信息冗余、包含的形状信息不够完整等问题,并能够重建图形,突出局部的形变,能够直观地比较出研究对象之间的细微差别。研究亮点:地标点法是国外最新发展出并被广泛使用的形态测量方法,该方法以地标点的坐标来表示生物的形状信息,再通过旋转与重叠,用网格图形和相对扭曲分析样本间的形状差异。本文在国内首次使用该方法有效地区分了短吻鲾的不同地方种群。

Morphology of two Leiognathus brevirostris stocks was analyzed by multivariate and geometric morphometrics. The first two principal components （76. 29% ） could obviously identify two stocks from Yangjiang and Zhanjiang in principal components analysis by multivariate morphometrics. The first three principal components （64. 03% ） could also obviously identify two stocks in relative warps anlysis. Morphology difference was mainly on the head of Leiognathus brevirostris from grid deformation. Compared to traditional multivariate morphometrics, landmark method avoided uneven and redundant aspects of form, and allowed graphic reconstruction of shape to investigate minute shape variation among objects of study.