河南省田间3种主要瓢虫对飞蓬指管蚜的捕食功能

Functional responses of three main ladybug preys to Uroleucon erigeronensis in fields in Henan Province

异色瓢虫、七星瓢虫和龟纹瓢虫在5 min内的移动距离分别为137.14、109.1 cm和9.1 cm,前两者在相同时间内的移动距离均显著高于后者;异色瓢虫和七星瓢虫在不同猎物密度下对飞蓬指管蚜的日捕食量均显著高于龟纹瓢虫;异色瓢虫、七星瓢虫和龟纹瓢虫对飞蓬指管蚜的捕食上限分别为157.21、120.52头和81.66头。3种瓢虫对飞蓬指管蚜捕食功能均符合HollingⅡ型功能反应模型;3种瓢虫捕食飞蓬指管蚜的寻找效应与飞蓬指管蚜密度呈线形相关,随飞蓬指管蚜密度增加,3种瓢虫的寻找效应均降低。

The moving range of Harmonia axyridis, Coccinella septempunctata and Propylaea japonica in five mi nutes was 137.14cm, 109.1cm and 9.1cm, respectively. Obviously, the first two were remarkably higher than the third. The predation of Uroleucon erigeronensis by H. axyridis and C. septempunctata per day was also remarkably higher than that by P. japonica. The upper limit for H. axyridis, C. septempunctata and P. japonica preying up on U. erigeronensis was 157.21, 120.52 and 81.66, respectively; the predation functions of the three ladybugs were all conformed to Holling Type Ⅱ. The searching efficiency of the three ladybugs was linearly correlated with prey density, which was decreased with the increase of prey density.