摘要
马尼拉陡胸茧蜂对斜纹夜蛾幼虫不同密度的功能反应属于Holling第Ⅱ型,按Holling(1959)圆盘方程测定了雌蜂攻击力,其攻击(寄生)的理论上限为171头。陡胸茧蜂间存在相互干扰作用,其寄生效应随自身密度的增加按Watt(1959)模型下降。当蜂密度不变、奇主密度变动时,被寄生的奇主数随着寄主密度的增加而增加,逐渐趋向其寄生数量的理论上限,但寄生率随之而逐渐下降;当寄主密度不变、蜂密度变动时,被寄生的奇主数和寄生率随蜂密度的增加而呈对数函数曲线增长。
The parasitizing effect of Snellenius manilae(Ashmead),a Braconid endoparasite of Spodoptera litura (Fabr.), was studied in the laboratory. The functional response of the wasp to different host density belonged to Holling's type Ⅱ (1959). The wasp reacted markedly to the presence of other hunting individuals nearby. The net effect of this mutual interference was that the searching and attacking efficiency beeame an inverse function of the wasp density on Watt's model (1959), the number of the host parasitized per female wasp decreasing with increased wasp density. When the number of parasites was constant and the host density was varied, the number of parasitized host increased with the increase in host density, gradually approaching the theoretical limit, while the percentage of parasitism decreased. When the host density was constant and the number of waspa was varied, the percentage of parasitism and the number of parasitized host both increased with the increase in parasite density tracing a curve of logarithmic function.
出处
《华南农业大学学报》
CAS
CSCD
1989年第4期35-41,共7页
Journal of South China Agricultural University
关键词
陡胸茧蜂
钭纹夜蛾
寄生
Snellenius manllne Spodoptera litura,Functional response,Mutual interference
