黑带食蚜蝇体色变异的研究

通过对黑带食蚜蝇Episyrphus balteatus(De Geer)体色变异的研究，发现黑带食蚜蝇存在深色型和浅色型2种基本形式，体色变异具有明显的季节性，深色型个体出现在温度较低的秋季及早春，浅色型个体发生在温度较高的春夏季节；在腹部色斑方面，深色型和浅色型个体中均存在变异，可划分为8种类型，腹部色斑的变异在浅色型个体中较为丰富，腹部不同体节背板上色斑的变异程度不同；黑带食蚜蝇在体型大小方面同样存在差异，这些变异的多态性可能是食蚜蝇系统学研究中异名产生的一个重要原因。因此，食蚜蝇类群的个体体色变异在系统学研究中是一个必须特别注意的问题。

Variation of body color in Episyrphus balteatus

An examination of phenotypic variation revealed differences in body color, abdominal color patches and body size in Episyrphus balteatus. There was distinct seasonal plasticity in body color, the darker form occurred when the temperature was lower. The paler form emerged in the spring and summer when the temperature was higher. The variation in the form of abdominal color patches could be divided into eight types, variations were richer in paler individuals than darker ones and the plasticity of color patches on different tergites was not the same. There was also plasticity in body size. These variations may be one of the main causes of synonymy. Much more research effort should be directed towards the systematics of syrphids.