长江、辽河、瓯江中华绒螯蟹种群的形态判别

MORPHOLOGICAL IDENTIFICATION OF POPULATION OF ERIOCHEIR SINENSIS FROM CHANGJIANG,LIAOHE AND OUJIANG RIVERS

为比较不同水系中华绒螯蟹种群的形态特点，建立判别中华绒螯蟹水系来源的方法，以辽河、长江、瓯江中华绒螯蟹成蟹的三个种群为研究对象，测量了代表其形态特征的24个度量性状，处理后得48个形态特征参数；然后用逐步判别的方法筛选了其中能提供附加信息的6个参数，并建立了Beyes判别函数；最后对判别进行拟合，拟会概率雄蟹为92．39％，雌蟹为89．37％。用逐步判别的方法对中华绒螯蟹的不同种群进行比较并判别其水系来源是可行的。

In order to compare the morphological characters of three populations of Chinsemitten crab (Eriocheir sinensis ) from Changjiang, Liaohe and Oujiang rivers and to establish a method to identify their origin, firstly, 24 meassurable verialbles,representing their morphological characters,were measured, after size corrected,48 morphological parameters were abtained. Secondly,6 different parameters for male Chinese mitten crab and female Chinse mitten crab,which shows higher contribution for identification, were selected by the method of stetwise discrimination, and Bayes discriminant functions were estadlished. At last, the discriminant results were fitted, the fitted probability of male and female Chinese mitten crab is 92.39% and 89.37%,respectively. It is feasible to compare the different river populations of Chinse mitten crab and to identify their origin by the method of stepwise discrimination.