Changes induced by Hymenolepis diminuta (Cestoda) in the behaviour of the intermediate host Tenebrio molitor (Coleoptera)

Abstract

Metacestodes of the rat tapeworm, Hymenolepis diminuta, have been shown to induce behavioural changes in the intermediate host Tenebrio molitor (Coleoptera). Male and female beetles, examined 11–12 days postinfection, were shown to exhibit a significant decrease in activity and photophobic behaviour. In addition, a significant loss of response to aggregation pheromone occurred in both sexes. No differences in host behaviour were detected 4–5 days postinfection. It thus appears that behavioural changes are associated with parasite maturity. We were unable to demonstrate a dose-dependent loss of photophobic behaviour.