不同饥饿程度拟小食螨瓢虫对朱砂叶螨的捕食作用

Predation of Stethorus(Allosstethorus)parapauperculus in different extent of starvation to Tetranychus cinnabarinus

为明确饥饿程度对拟小食螨瓢虫Stethorus(Allosstethorus)parapauperculus控害潜能的影响,本研究通过比较不同饥饿程度下拟小食螨瓢虫对朱砂叶螨Tetranychus cinnabarinus的功能反应和自身密度干扰效应,探讨不同饥饿程度拟小食螨瓢虫对朱砂叶螨的捕食作用。结果表明,饥饿程度对拟小食螨瓢虫朱砂叶螨的捕食量有明显的影响,瓢虫的取食量与朱砂叶螨的密度呈正相关,表现为饥饿48 h>饥饿24 h>未饥饿;拟小食螨瓢虫对各虫态朱砂叶螨的捕食作用均符合Holling-Ⅱ模型。在一定空间范围内,拟小食螨瓢虫个体间存在竞争和相互干扰,Hassell-Varley模型能较好地反映拟小食螨瓢虫在捕食各虫态朱砂叶螨时受自身密度的干扰情况。在同样饥饿状态下,随着瓢虫自身密度增加,捕食效率降低,干扰效应增大。

In order to clarify the effect of hunger on the control efficacy of Stethorus(Allosstethorus)parapauperculus to Tetranychus cinnabarinus,the functional response of S.parapauperculus to T.cinnabarinus and its own density interference effect under different extent of starvation were explored in this study.The results indicated that,the control efficacy of S.parapauperculus on different stages of T.cinnabarinus belongs to the Holling-II model.With the density increase of T.cinnabarinus,the feeding of S.parapauperculus increasesed.Its predatory effect was also influenced by its starvation,with 48 h for starvation>24 h for starvation>control(without hungry);however,the effects of starvation for 24 h and 48 h on their predation were generally not significant.Within a certain range of space,there were competitions and mutual interference among individuals of S.parapauperculus.The Hassel-Varley model can reflect the interference of self-density of S.parapauperculus in different starvation states as they are feeding on different development stages of T.cinnabarinus.In the same starvation condition,with the density of S.parapauperculus increased,the efficiency of predation decreased and the interference effect increased.