异色瓢虫对枫杨刻蚜的捕食功能反应

Predation Response of Harmonia Axyridis Against Kurisakia Onigurumi

【目的】通过测定异色瓢虫对枫杨刻蚜的捕食功能反应,为异色瓢虫资源利用提供理论依据。【方法】通过测定各龄异色瓢虫在不同枫杨刻蚜密度下的捕食量,采用HollongⅡ圆盘方程和HollingⅢ新模型方程评价在不同枫杨刻蚜密度下异色瓢虫捕食能力的大小。【结果】异色瓢虫对枫杨刻蚜的捕食能力表现为异色瓢虫成虫> 4龄幼虫> 3龄幼虫>2龄幼虫>1龄幼虫。异色瓢虫成虫的捕食功能反应a'/Th值高达568.57,4龄的a'/Th值为539.84,3龄的a'/Th值为292.12,2龄的a'/Th值为101.63,1龄的a'/Th值为19.70;4龄幼虫对枫杨刻蚜的最佳寻找密度最大,达到93.48头,其后依次为成虫> 3龄幼虫> 2龄幼虫>1龄幼虫。【结论】异色瓢虫4龄幼虫与成虫对枫杨刻蚜的捕食能力较强;异色瓢虫对枫杨刻蚜的寻找效应随枫杨刻蚜密度的增大而减小。

[Objective] This study aimed to record and analyze the predation response of Harmonia axyridis against Kurisakia onigurumi to provide a theoretical basis for the resource utilization of the ladybird beetle. [Method] Predation numbers at different prey densities were measured[or the Harmonia Axyridis in each instar. And the predation ability of the Harmonia axyridis in different densities of Kurisakia onigurumi was evaluated with the Hollong Ⅱ and Holling Ⅲ models. [Result] The results showed that the predation ability of ladybirds against aphids, as well as the instantaneous attack rate（a＇/Th） of Harmonia axyridis to Kurisakia onigurumi increased with the increase of the instar： 1 instar 19.70, 2 instar 101.63, 3 instar 292.12, 4 instar 539.84, adult 568.57. The 4 instar larvae had the highest best seeking density （93.48） followed by adults, 3 instar, 2 instar and 1 instar. [Conclusion] The 4 instar lar vae and adults showed the strongest predation abilities against Kurisakia onigurumi and the search effect to the Kurisakia onigurumi was decreased with the increase of the prey density.