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期 刊 ：植物保护学报 2008年

关键词：东亚小花蝽；西花蓟马；捕食作用；

Keywords:Orius sauteri, Frankliniella occidentalis, predation,

摘 要 ：在室内条件下进行东亚小花蝽2、4龄若虫对西花蓟马若虫的捕食功能反应与搜寻效应试验。结果表明:在供试温度下,其捕食功能反应均符合Holling II型方程;相同温度下,东亚小花蝽若虫的捕食量随猎物密度的增加而增加,而搜寻效应随之降低。相同猎物密度条件下,18~26℃之间,随着温度的升高,东亚小花蝽若虫对西花蓟马若虫的捕食量增加、搜寻效应增强;而在26~30℃之间,趋势相反。26℃时,东亚小花蝽2、4龄若虫日捕食量最大,捕食上限分别达18.2头和38.2头;处置1头猎物所需时间(T_h)最低,分别为0.0549天和0.0262天;瞬时攻击率(a)最高,分别为1.0574和1.3665。东亚小花蝽2、4龄若虫捕食作用率与其密度的关系分别为E=0.4034 P^-0.6669和E=0.3851P^-0.4767;分摊竞争强度与其密度的关系分别为I=1.0167lgP+0.0172和I=0.8088lgP+0.0142。

Abstract:Functional response and searching efficacy of the 2^nd and 4^th instar Orius sauteri nymphs on Frankliniella occidentalis nymphs were evaluated under laboratory conditions. The functional response could be described with Holling II equation within the range of tested temperatures. At the same temperature, predation capacity of O.sauteri nymph on F.occidentalis nymphs increased with the increasing density of F.occidentalis nymphs, while searching efficacy decreased. At same prey density, predation capacity and searching efficacy of O.sauteri nymph increased with the increase of temperature at 18-26℃, however decreased at 26-30℃. At 26℃, predation number of 2^nd and 4^th instar O.sauteri was the highest, which was 18.2 and 38.2, respectively; T_h was the lowest, which was 0.0549d and 0.0262d, respectively; a was the highest, which was 1.0574 and 1.3665, respectively. The relationship between predation ratio (E) and density of the O.sauteri nymph (P) was described by equation of E=0.4034P^-0.6669 and E=0.3851P^-0.4767, respectively. The relationship between intensity of scrambling competition (I) and the density of the O.sauteri nymph (P) was I=1.0167lgP+0.0172 and I=0.8088lgP+0.0142, respectively.

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