摘要
对异色瓢虫(Harmonia axyridis Pallas)四种变异类型在同种猎物不同密度下的捕食作用、相同猎物密度不同捕食者密度下的干扰作用以及异色瓢虫不同遗传变异类型幼虫的种内个体拥挤效应进行了比较研究。结果表明,异色瓢虫的各种不同变异类型在捕食过程中有明显差异。在捕食效果对猎物密度的依赖性上,黄底型和二窗型的大,黑缘型和四窗型的小,在相同猎物密度下,捕食者个体间干扰对捕食效果的影响,黄底型最大、四窗型次之、黑缘型最小。黑缘型幼虫个体间的空间拥挤效应比黄底型的大。研究结果对于了解该虫自然种群动态及该物种的种下进化有重要意义。
This paper dealt with the Comparisons of pre-dation and crowding effect of the four genetic vara-tion types of Harmonia axyridis under laboratory conditions. Results showed that there existed sigifi-cant differences of predative charactristics and crowding effect among the four genetic viriation types (Succinea, Conspicua, Spectabilis. Aulica ). These could help us to understand the changes of the polymorphic structure and the population dynamics of this beetle in time and space.
关键词
异色瓢虫
变异类型
捕食特征
拥挤效应
瓢虫科
Harmonia axyridis Genetic viriations types Predative charactristic Crowding effect.
