Sexual isolation of genetically differentiated sympatric populations of Drosophila melanogaster in Brazzaville, Congo: the first step towards speciation?

Article Abstract:

Sexual isolation of two genetically differentiated populations of Drosophila melanogaster that are sympatric has been investigated in Brazzaville, Congo, with consideration of whether it may show the first step toward speciation. One population came from the suburban countryside and one from a city brewery. Morphology, microsatellites, allozymes, cuticular hydrocarbons and sexual behavior were compared. They differed except in morphological ways. The country population was like other African populations, but the urban was was like European populations. Incipient reproductive separation was seen in mating-choice experiments. It appears that man-adapted fruit fly populations have gone back to their putative place of origin in Africa.

Congo, Mate selection, Origin of species, Congo (Kinshasa)

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Genetic dimension of the coevolution of virulence-resistance in Drosophila-parasitoid wasp relationships

Article Abstract:

Research has been conducted on variations in parasite virulence and host resistance. The studies of host-parasitoid system demonstrate that the geographical variations of traits are subjected to antaginistic selection governed by variations, and that the main parameter accounting for these geographic variations is the host species number.

Science & research, Evolution, Wasps, Pathogenic microorganisms, Host-parasite relationships, Biogeography, Pathogenic organisms

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