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Spatiotemporal distributional patterns of Bulinus rohlfsi (Clessin), Bulinus forskali (Ehrenberg) and Bulinus senegalensis Muller in newly-irrigated areas in northern Nigeria



Spatiotemporal distributional patterns of Bulinus rohlfsi (Clessin), Bulinus forskali (Ehrenberg) and Bulinus senegalensis Muller in newly-irrigated areas in northern Nigeria



Journal of Molluscan Studies 503: 137-152



Over a 16 mo. period, monthly net samples of aquatic snails were collected from 30 sites within distributary canals and drains in a newly-irrigated area of the South Chad Irrigation Project, Borno State, northern Nigeria. Initial colonization in distributary canals was at the blind ends where bulrushes had become established, the colonizing species being B. forskali and B. rohlfsi. These 2 species also invaded the drains where B. senegalensis occurred during the rains. In a concurrent study, weekly Typha-leaf mat samples of B. rohlfsi were collected from 3 sites in a distributary canal and data on changes in population structure, density and reproductive activity were obtained. Patterns of colonization are discussed in relation to the probable origins of the snails, their modes of dispersal and habitat preferences. Population changes in B. rohlfsi are considered in relation to environmental factors. The potential for other planorbids to eventually invade the area is also considered.

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