| Abstract: | Four aromatic compounds (2,4-dimethoxyaniline, 1,3-dimethoxybenzene, 2-aminophenol, phenol) found in Neanura muscorum (Collembola, Neanuridae) have been investigated for their role as deterrents against the predatory mite Pergamasus norvegicus (Acarina, Parasitidae). 2-Aminophenol has deterring properties against P. norvegicus, the other substances show no effect as single substances nor is there a synergistic effect.The reaction of three predators, Microvelia reticulata (Heteroptera, Veliidae), Gambusia affinis (Teleostei, Cyprinodontidae) and Rana temporaria (Amphibia, Ranidae) on Podura aquatica (Collembola, Poduridae) is reported. The strongest deterring effects of P. aquatica could be observed with G. affinis. M. reticulata also shows behavioural changes that can be attributed to deterring effects of P. aquatica. The collembolan has no deterring effects on R. temporaria.A synopsis of literature dealing with deterring effects of collembola on arthropod predators is given. |
