Aedes Mascarensis Macgregor on Mauritius II. Genetic variability of field populations (Diptera: Ciilicidae)1

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Abstract
It had been suggested that the most plausible explanation for variation in Aedes mascarensis resembling Aedes aegypti was introgressive hybridization of A. mascarensis with subsequently eradicated population of A. aegypti , in an environment disturbed by rapid demographic change and use of residual sprays in Mauritius. Adult A. mascarensis females from 6 locations on Mauritius were analyzed for variation in 15 characters. No cline in variation was noted from the areas of presumed greatest contact between the 2 species to those remote from the former A. aegypti populations. The most plausible alternative to introgression is that A. mascarensis is a distinct but extremely variable species that may be a relict population of an ancestral type from which A. aegypti sprang.

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