陕西长安及汉中两地中华稻蝗的比较。

通过对采自陕西长安及汉中地区的中华稻蝗Oxya chinensis(Thunberg)之11个数量性状进行了多元分析。在主成分分析的第1、2主轴所构成的平面上，生活在两个地区的稻蝗个体被明显分成两个集团。此外，两地稻蝗在卵囊平均含卵量、卵粒大小及有效积温等生物学特性上均有显著的差异，这意味着长期的地理阻隔(秦岭山脉)致使两地的稻蝗演化成两个地理宗。由于使用传统的形态方法无法准确区分这两个地区的稻蝗，我们为这两个居群的雌性和雄性成虫分别建立了线性判别函数，以便为今后进一步的小进化研究奠定一个基础。V(雌性)＝-11.67+195.44H+1.91E/F+8.663MX+22.80F/C+0.34P一3.50MZ-102.76H/C-42.51F；y(雄性)＝-17.06+30.183MZ+4.313F，这里，当v(雌性或雄性)<0时，个体属于长安县的居群，否则，属于汉中的居群。

COMPARATIVE STUDY ON TWO POPULATIONS OF OXYA CHINENSIS (THUNBERG) IN SHAANXI PROVINCE

In the present paper, 11 morphometric characters of Oxya chinensis from Chang An and Han Zhong areas of Shaanxi Province were studied by means of PCA (Principal Component Analysis) and DA (Discriminate Analysis). On the plane constructed by the 1st and 2nd axis of PCA, the individuals from the two locations are separated clearly into two groups along the 1st axis. In addition, the two populations are different sighificantly in many biological aspects: the number of eggs contained in an egg-capsule, the size of eggs, the oxygen consumption rate during embryonic development, the threshold and effective accumulative temperatures of egg development. Taking the geographical barrier (the Qingling Mountain) into consideration, we suggest that the rice grasshopper has evolved into two separate geographic races in Chang An and Hang Zhong areas. Because it is difficult to identify the two populations by using the traditional morphometric methods, two discriminate functions are established for discriminating the races of female and male individuals respectively: V (female ) = - 11. 67 195. 44H 1.91E/F 8. 66MX 22. 80F/C 0.34P - 3. 50MZ - 102. 76H/C -42. 51F. V (male) = -17. 06 30. 18MZ 4. 31F. Here is V (female or male) <0, the individual belongs to Chang An population, otherwise, it is subordinate to Han Zhong race.