Studies on the ecology and distribution of some medically important freshwater snail species in Bauchi State, Nigeria.

Two Local Government Areas in Bauchi State, Nigeria, harboring many snail infested water bodies were surveyed for the presence of intermediate host snail vector species for a period of 13 months. This study revealed five medically important snail species which were comprised of Bulinus (Physopsis) globosus, Bulinus (Bulinus) truncatus, Bulinus (Bulinus) forskalii, Biomphalaria pfeifferi, and Lymnaea natalensis. A significant fluctuation in relative abundance of these snails was observed with a peak at the beginning of the dry season. This peak was then followed by a decline during the rainy season resulting in almost the elimination of the snails in some sites and low numbers in others. It was equally observed that the snails had a water velocity, rainfall and temperature-dependent seasonal cycle with rapid increases in abundance during periods of favorable conditions. Snail-plant relationships and preferred substratum were also evaluated. Results obtained from this study are very vital for the planning of snail control in Bauchi State.International Journal of Biological & Chemical Sciences Vol. 1 (2) 2007: pp. 121-12