松突圆蚧寄生性天敌的种间竞争关系

Interspecific competition between parasitoids of Hemiberlesia pitysophila

花角蚜小蜂具有明显的种内寄生识别能力,友恩蚜小蜂则不具有,可在同一寄主体内重复产卵。采用Lotka-Volterra提出的种间竞争模型进行模拟,花角蚜小蜂和友恩蚜小蜂连续3代种群数量增长的竞争方程为:dN1/dt=2.432 2N1×(91.228 2-N1-0.021 0N2)/91.228 2;dN2/dt=1.854 6N2×(39.071 6-N2-1.965 9N1)/39.071 6。自引种定殖成功后,花角蚜小蜂成为林间控制松突圆蚧的优势种天敌。

Coccobius azumai Tachikawa could distinguish the hosts parasitized by conspecific parasitoids, while Encarsla amicula Viggiani et Ren could not. En. amicula laid eggs repeatedly in the same host. Lotka-Volterra equation was used to simulate the competition between C. azumai and En. amicula, and after 3 generations, the result was dN1/dt = 2.432 2N1× （91.228 2 -N, -0. 021 0N2）/91. 228 2 ; dN2/dt = 1. 854 6 N2 × （39. 0716 - N2 - 1. 965 9N, ）/39. 071 6. C. azumai has become the domimant parasitoid since it was introduced and colonized successfully in Fujian.