毛健夜蛾性二型性代别比较

Comparison of sexual dimorphism between G1 and G2 in Brithys crini Fabricius(Lepidoptera: Noctuidae)

为探明毛健夜蛾性二型性现象及代别差异,比较了第1和第2代毛健夜蛾体重和体型,结果表明:(1)室内饲养的第1代和第2代毛健夜蛾均具有性二型性现象,雌性个体大于雄性个体;(2)毛健夜蛾性二型性现象存在代别差异,第1代的性二型性现象比第2代更为明显。这些研究结果初步揭示了毛健夜蛾性二型性现象可因室内饲养的代别不同而异。

To understand the sexual dimorphism of Brithys crini Fabricius and effects of different generations on the sexual dimorphism, the body weight and size of generation 1 （G1） and generation 2 （G2） were compared under the laboratory conditions. The results showed： （1）There was sexual dimorphism in G1 and G2 of B. crini reared in the laboratory. The female was larger than the male. （2）Sexual dimorphism differed between G1 and G2. Sexual dimorphism in G1 was more obvious than that in G2. These results indicated that the sexual dimorphism in B. crini maybe different from different generations reared in the laboratory.