Flores A, Olvera H, Rodríguez S, Barranco J
Depto de Producción Agrícola y Animal, Univ Autónoma Metropolitana, Hueso 1100, Villa Quietud, DF, 04960, México.
Neotrop Entomol. 2013 Aug;42(4):407-11. doi: 10.1007/s13744-013-0139-z. Epub 2013 May 17.
Functional response of the predator Chilocorus cacti (Linnaeus) (Coleoptera: Coccinellidae) on five densities of Dactylopius opuntiae (Cockerell) (Hemiptera: Dactylopiidae) female adults was assessed under laboratory conditions. The searching efficiency of C. cacti significantly decreased as prey density increased. The logistic regression for the predator had a negative and significant linear parameter indicating a type II functional response. Non-linear regression for Holling predator equation estimated a handling time of 1.79 ± 0.129 h and attack rate coefficient of 0.1003 ± 0.030. Most of this handling time was because the predator spent a lot of time removing the waxy coating that protects adult females of D. opuntiae. Chilocorus cacti consumes females of D. opuntiae in their reproductive stage; therefore, it could be an effective natural enemy to suppress or regulate low density populations of D. opuntiae, preventing them to reach high densities.
在实验室条件下评估了捕食性天敌仙人掌红瓢虫（Chilocorus cacti，林奈命名）（鞘翅目：瓢虫科）对五种密度的仙人掌胭脂虫（Dactylopius opuntiae，科克雷尔命名）（半翅目：胭蚧科）雌成虫的功能反应。随着猎物密度增加，仙人掌红瓢虫的搜索效率显著下降。捕食者的逻辑回归具有负且显著的线性参数，表明其为II型功能反应。对Holling捕食者方程的非线性回归估计处理时间为1.79±0.129小时，攻击率系数为0.1003±0.030。大部分处理时间是因为捕食者花费大量时间去除保护仙人掌胭脂虫雌成虫的蜡质层。仙人掌红瓢虫取食处于生殖阶段的仙人掌胭脂虫雌虫；因此，它可能是抑制或调节低密度仙人掌胭脂虫种群、防止其达到高密度的有效天敌。
