ALLOZYME VARIATION AMONG POPULATIONS OF BIOMPHALARIA PFEIFFERI (KRAUSS, 1848) (GASTROPODA: PLANORBIDAE) IN CAMEROON |
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| Authors: | MIMPFOUND, R. GREER, G.J. |
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| Affiliation: | Cameroon Schistosomiasis Project, IMPM Yaounde, Cameroon; *Faculty of Science, General Biology Laboratory BP 812, University of Yaounde, Yaounde, Cameroon; and !["{dagger}"]("/math/dagger.gif") Department of Tropical Medicine, School of Public Health and Tropical Medicine, Tulane University New Orleans, Louisiana, USA |
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| Abstract: | Allozyme electrophoresis was used to study genetic diversityamong the freshwater, hermaphroditic snail Biomphalaria pfeifferiin Cameroon. Four of 19 loci studied were polymorphic. The allozymesfor two loci, aspartate aminotransferase-1 (AAT-1) and isocitratedehydrogenase (IDH), showed distribution patterns related toclimatic zones. AAT-1100 and IDH100 occurred predominantly inthe Tropical Climatic Zone, located in the northern half ofthe country. AAT-1140 and IDH90 were common in the EquatorialZone. Intrapopulation variations occurred in 5 of 19 populationsampled. Only one population, polymorphic for AAT-1 locus, waspanmictic. The other 4 populations were not in Hardy-Weinbergequilibrium. The deficiency of heterozygotes in those populationsis unusual for a member of the genus Biomphalaria and may bedue to a predominance of self-fertilization. Other explanationsinclude ecological factors or the presence of segregated sub-populationsthat do not outcross. This latter hypothesis is supported bythe total absence of heterozygotes for PGM alleles. (Received 24 August 1989; accepted 14 September 1989) |
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