SEASONAL FLUCTUATIONS IN POPULATION DENSITES OF BULINUS SENEGALENSIS AND B. TRUNCATUS (PLANORBIDAE) IN TEMPORARY POOLS IN A FOCUS OF SCHISTOSOMA HAEMATOBIUM IN NIGER: IMPLICATIONS FOR CONTROL |
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| Authors: | VERA C; BREMOND P; LABBO R; MOUCHET F; SELLIN E; BOULANGER D; POINTIER JP; DELAY B; SELLIN B |
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| Institution: |
1Laboratoire des schistosomiases, C.E.R.M.E.S., O.C.C.G.E. / ORSTOM B.P. 10 887, Niamey, Niger;
2Institut des Sciences de l'Evolution, U.S.T.L., Place Eugène Bataillon 34 095 Montpellier Cedex, France; and
3Laboratoire de Biologie Marine et Malacologie, E.P.H.E. / URA C.N.R.S. 698 Centre de Biologie et d'Ecologie Tropicale et Méditerranéenne, Université 52 Av. de Villeneuve, 66 860 Perpignan Cedex, France |
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| Abstract: | Annual and seasonal changes in population densities of Bulinussenegalensis Müller 1781 and B. truncatus (Audouin, 1827)were studied in temporary pools of the west sahelian zone inNiger in relation to environmental factors. B. senegalensisis present in the temporary pools whatever their duration, whereasB. truncatus inhabits only the more persistent pools. B. senegalensispopulations develop mostly during the rainy season when thewater temperature is warm. B. truncatus is most abundant afterthe rainy season when the water temperature is cooler, but thissnail may increase when the water temperature is warmer duringunusual rainy seasons with low and intermittent rainfall. Fieldobservations suggest that interspecific competition is exceptionallyoccurring in the pool colonized by both B. senegalensis andB. truncatus. The implications of these observations on treatmentand retreatment schedules for schistosome infection in peopleand on snail control in temporary pools are discussed. (Received 4 May 1993; accepted 22 July 1994) |
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