COMPARATIVE FITNESS AND REPRODUCTIVE ISOLATION BETWEEN TWO BULINUS GLOBOSUS(GASTROPODA: PLANORBIDAE) POPULATIONS |
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| Authors: | NJIOKOU, F. BELLEC, C. N'GORAN, E. K. YAPI, G. YAPI DELAY, B. JARNE, P. |
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| Affiliation: |
*Laboratoire d'Epidémiologie des Grandes Endemics Tropicales ORSTOM, 911, Avenue Agropolis, B. P. 5045, 34032 Montpellier, France;
 Centre Universitaire de formation en Entomologie Médicale et Vétérinaire C.E.M.V., 01 B.P. 2597, Bouaké 01, Côte d'lvoirc; and
 Laboratoire de Génétique et Environnement, Institut des Sciences de I'Evolution, Univesité de Montpellier 11 Place Eugène Bataillon, 34095 Montpellier Cedex 5, France |
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| Abstract: | Bulinus globosus, an intermediate host of schisto-somes, isa self-fertile hermaphrodite species whose regular mating systemis cross-fertilization. Fitness of selfing individuals originatingfrom two geographically remote populations (Elevi, Ivory Coast;Daikaina, Niger) was scored. Individuals were then paired eitherwith individuals from their own population, or with individualsfrom the other population. Electrophoretic analysis showed thatpairing female Elevi and male Daikainaindividuals results in only a low level of outcrossing, whereasthe reverse pairings produced almost only outcrossed offspring.This could reflect unilateral partial isolation between thetwo populations. However, analysis of fitness values withinand among groups of self-fertilizing and cross-fertilizing individuals,as well as electrophoretic data, suggest that selfing (or partialselfing) is the regular mating system in Elevi. Such experimentsare relevant to the biological control of schistosiomasis byintroducing resistant snails from allopatric populations, becausethey allow an assessment of the fate of introduced resistantgenes. (Received 30 December 1991; accepted 13 March 1992) |
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