Abstract
About 120 strains derived from natural populations of D. melanogaster collected between 1983 and 1986 in the Languedoc–Roussillon area (France) were tested for their characteristics in the P–M system, enzymatic polymorphism and infection by the sigma virus. Over these four years, a clear geographical pattern was found for the P–M system over a distance of 250 km, with weak P populations in the northern zone of the area studied, Q populations in the centre and M' populations in the south. This pattern was stable for P sterility potential but a decrease of the M cytotype level was observed in the southernmost zone. During the same period, the frequency of flies infected by the sigma virus also showed a regular geographical pattern with the highest values in the central zone. The frequency of infected flies increased steadily during this period. In the enzymatic study, neither geographical nor temporal trends were detected for the loci analyzed. Correlations among the different systems are discussed.
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