迭球螋对落叶松球蚜成虫的捕食作用

Predation function of Forficula vicaria to Adelges laricis

在室内研究了捕食性天敌迭球螋成虫对落叶松球蚜成虫的捕食功能反应与搜寻效应。结果表明,迭球螋对落叶松球蚜成虫的捕食功能反应属HollingⅡ型;根据HollingⅢ型功能反应新模型Na=a·exp(-b/N)计算出最佳寻找密度22.47头/皿;利用Holling寻找效应与猎物密度关系式S=a/(1+aThN)计算了寻找效应,结果表明寻找效应随猎物密度的增加而降低;捕食作用率与其密度的关系为E=0.189 4P-0.3202;分摊竞争强度与其密度的关系为I=0.579 7lgP+0.000 8。

In the laboratory, the predation of Adelges laricis adults by Forficula vicaria adults was studied. The re- suits showed that the functional response of F. vicaria adults to A, laricis adults belonged to Holling type Ⅱ mod- el. The best seeking density was 22.47 individual per dish. The relationship between searching efficiency and F. vicaria adult density was also studied by the Holling＇s model S = a/（1 ＋ a Th N）, showing that the searching effi- ciency declined when F. vicaria adult densities increased. The relationship between predation ratio （E）and the density of F. vicaria adults （P） was described by the equation： E=0. 189 4P-0.3202. The relationship between in- tensity of scrambling competition （I） and the density of F. vicaria adults （P） was I=0. 579 7 lgP＋0. 000 8.