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- Title
Molecular evidence of incipient speciation within Anopheles gambiae s.s. in West Africa.
- Authors
Torre, A. della; Fanello, C.; Akogbeto, M.; Dossou-yovo, J.; Favia, G.; Petrarca, V.; Coluzzi, M.
- Abstract
Abstract We karyotyped and identified by polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP) analysis Anopheles gambiae s.s. samples collected in several African countries. The data show the existence of two non-panmictic molecular forms, named S and M, whose distribution extended from forest to savannahs. Mosquitoes of the S and M forms are homosequential standard for chromosome-2 inversions in forest areas. In dry savannahs, S is characterized mainly by inversion polymorphisms typical of Savanna and Bamako chromosomal forms, while M shows chromosome-2 arrangements typical of Mopti and/or Savanna and/or Bissau, depending on its geographical origin. Chromosome-2 inversions therefore seem to be involved in ecotypic adaptation rather than in mate-recognition systems. Strong support for the reproductive isolation of S and M in Ivory Coast comes from the observation that the kdr allele is found at high frequencies in S specimens and not at all in chromosomal identical M specimens. However, the kdr allele does not segregate with molecular forms in Benin.
- Publication
Insect Molecular Biology, 2001, Vol 10, Issue 1, p9
- ISSN
0962-1075
- Publication type
Academic Journal
- DOI
10.1046/j.1365-2583.2001.00235.x