淡翅小花蝽对黄胸蓟马的捕食功能反应与搜寻效应

Functional response and searching efficiency of Orius tantillus against Thrips hawaiiensis

为评价淡翅小花蝽Orius tantillus对黄胸蓟马Thrips hawaiiensis的捕食作用及控害潜能,在室内条件下研究了淡翅小花蝽对黄胸蓟马2龄若虫的捕食功能反应、搜寻效应和干扰反应。结果表明:淡翅小花蝽对黄胸蓟马若虫的捕食功能反应符合HollingⅡ型,其捕食量随着猎物密度的增加而提高,其搜寻效应随着猎物密度的增加而下降。淡翅小花蝽成虫具有较强的种内干扰作用,随着自身密度的增加,其平均捕食量减少,捕食作用率降低。根据Beddington模型E=a/[1+aT h N+bT w(P-1)]拟合获得淡翅小花蝽成虫捕食黄胸蓟马2龄若虫的干扰模型E=0.9685/(0.0110 N+1.3837 P-0.3837),表明淡翅小花蝽的搜寻效应随其自身密度和黄胸蓟马密度的增大而下降。研究结果表明淡翅小花蝽对黄胸蓟马具有较大防治潜力。

In order to evaluate the predatory function and potential management capacity of Orius tantillus against Thrips hawaiiensis,the functional response,searching efficiency and interference response of O.tantillus against T.hawaiiensis were studied under laboratory conditions.The predation of T.hawaiiensis by O.tantillus fitted to the Holling-typeⅡfunctional response.The predation rate was positively correlated with the prey density,while the searching efficiency was negatively correlated with the prey density.The mean predation rate decreased with increasing predator density,suggesting that there was a strong intraspecific interference in O.tantillus.The relationships between the searching efficiency(E),O.tantillus density(P)and T.hawaiiensis density(N)could be described by the Beddington model E=a/[1+aT h N+bT w(P-1)]:E=0.9685/(0.0110 N+1.3837 P-0.3837),suggesting that the searching efficiency declined when the densities of O.tantillus and T.hawaiiensis increased.This study indicates that O.tantillus has the potential as a biological control agent against T.hawaiiensis.