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.
Molecular evidence of incipient speciation within Anopheles gambiae s.s. in West Africa / DELLA TORRE, Alessandra; Fanello, C.; Akogbeto, M.; DOSSOU YOVO, J.; Favia, G.; Petrarca, Vincenzo; COLUZZI BARTOCCIONI, Caio Mario. - In: INSECT MOLECULAR BIOLOGY. - ISSN 0962-1075. - STAMPA. - 10:1(2001), pp. 9-18.
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Titolo: | Molecular evidence of incipient speciation within Anopheles gambiae s.s. in West Africa | |
Autori: | COLUZZI BARTOCCIONI, Caio Mario [Supervision] | |
Data di pubblicazione: | 2001 | |
Rivista: | ||
Citazione: | Molecular evidence of incipient speciation within Anopheles gambiae s.s. in West Africa / DELLA TORRE, Alessandra; Fanello, C.; Akogbeto, M.; DOSSOU YOVO, J.; Favia, G.; Petrarca, Vincenzo; COLUZZI BARTOCCIONI, Caio Mario. - In: INSECT MOLECULAR BIOLOGY. - ISSN 0962-1075. - STAMPA. - 10:1(2001), pp. 9-18. | |
Handle: | http://hdl.handle.net/11573/248866 | |
Appartiene alla tipologia: | 01a Articolo in rivista |