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Control of the snail hosts of schistosomiasis by environmental manipulation: a field and laboratory appraisal in the Ibadan area, Nigeria



Control of the snail hosts of schistosomiasis by environmental manipulation: a field and laboratory appraisal in the Ibadan area, Nigeria



Philosophical Transactions of the Royal Society of London B Biological Sciences 305(1123): 201-253



An ecological investigation of freshwater habitats near Ibadan, Nigeria, was carried out in an attempt to identify and evaluate key factors which might be manipulated to achieve control of the snail hosts (Bulinus, Biomphalaria, Lymnaea) of schistosomiasis and fascioliasis. Salvinia was found to be negatively associated with 4 of the snail species. The snails were tolerant to a wide range of chemical conditions except low oxygen concentration. However, the absence of aquatic macrophytes and lentic refugia in head waters and the presence of fast flowing water and high temperatures in shallow water were harmful. Although Lanistes libycus and Aplexa waterloti were efficient predators on the eggs and juveniles of snail hosts, other laboratory and field evidence appeared to preclude the possibility that they may be useful as biological control agents. However, there was evidence that Melanoides tuberculata might exclude the snails from eroding substrates in lentic habitats. Various integrated control measures in lotic and lentic habitats are discussed.

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Accession: 001176895

Download citation: RISBibTeXText

PMID: 6144118

DOI: 10.1098/rstb.1984.0056


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