【摘要】 通过开展几种优势天敌对莲纹夜蛾的捕食作用研究发现,在相同猎物密度下,拟水狼蛛雌成蛛的日捕食量>草间小黑蛛雌成蛛的日捕食量,龟纹瓢虫雌成虫的日捕食量>黑翅小花蝽雌成虫的日捕食量,说明拟水狼蛛和龟纹瓢虫对莲纹夜蛾1-2龄幼虫具有较强的控制能力.经拟合,它们各自的捕食功能反应均属HollingⅡ型反应,其圆盘方程分别为:Na=1.00260N/(1+0.98404N)(草间小黑蛛雌成蛛)、Na=0.94118N/(1+0.02804N)(拟水狼蛛雌成蛛)、Na=0.44238N/(1+0.00375N)(龟纹瓢虫雌虫)、Na=0.50312N/(1+0.01350N)(黑翅小花蝽雌成虫).a`/Th值的大小是反映天敌对猎物控制能力强弱的参数,供试的这4种天敌对莲纹夜蛾1-2龄幼虫控制作用效果的a`/Th值大小依次为:龟纹瓢虫雌成虫的a`/Th>拟水狼蛛雌成蛛的a`/Th>黑翅小花蝽雌成虫的a`/Th>草间小黑蛛雌成蛛的a`/Th.此外,研究结果还表明,天敌的捕食作用有较强的种内干扰效应,随着捕食者密度的增大,平均捕食量逐渐减少,捕食作用率也相应降低.更多还原

【Abstract】 When the predation of several predominant natural enemies on the larvae of Prodenia litura Fabricius being analysed,with the same quarry density,the order of predation number per day was as follow:Pirata subpiraticus> Erigonidium graminicolum(Sundevall),Propylaea japonica Thunberg >Orius agilis,which revealed that Pirata subpiraticus and Propylaea japonica Thunberg have stronger control ability on the 1rd-2nd larvae.It was fitted that,all the functional response fitted the model of Holling Ⅱtype well and the disc equation were Na=1.00260N/(1+0.98404N)(the female adult Erigonidium graminicolum(Sundevall)),Na=0.94118N/(1+0.02804N)(the female adult Piratasubpiraticus),Na=0.44238N/(1+0.00375N)(the female worm of Propylaea japonica Thunberg)and Na=0.50312N/(1+0.01350N)(the female adult Orius agilis),respectively.a`/Th can be a parameter which reflects the control ability of enemy to predation,as for the tested four kinds of natural enemy,the order was:a`/Th of female worm of Propylaea japonica Thunberg> a`/Th of the female adult Pirata subpiraticus> a`/Th of the female adult Orius agilis> a`/Th of the female adult Erigonidium graminicolum(Sundevall).At the same time,the study was also showed:intraspecific interference was found in the experiment,the average predation number and predation rate of natural enemy decreased with the increasing of its density.更多还原