During the last 10 years, the Simulium damnosum s.l. populations at the river Vina du Sud near Galim decreased considerably, as indicated by the declining biting rates on human fly-collectors. Yet the reason for this is not clear: Is it due to ecological changes in the micro-environment of the local breeding sites, parasites of the Simulium larvae or just the dilution of the adult fly-population by an increase of the population density of the human and bovine blood-hosts? Loulou performed a series of experiments to find answers.
The photo shows Jeremie (left) and Albert, studying the blackfly larval-population in the river Vina du Sud.