Species and populations of the Anopheles gambiae complex in Cameroon with special emphasis on chromosomal and molecular forms of Anopheles gambiae s.s.

Wondji, Charles ORCID: https://orcid.org/0000-0003-0791-3673, Simard, F., Petrarca, V., Etang, J., Santolamazza, F., Della Torre, A. and Fontenille, D. (2005) 'Species and populations of the Anopheles gambiae complex in Cameroon with special emphasis on chromosomal and molecular forms of Anopheles gambiae s.s.'. Journal of Medical Entomology, Vol 42, Issue 6, pp. 998-1005.

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Abstract

We studied the geographical distribution of species, chromosomal, and molecular forms of the Anopheles gambiae Giles (Diptera: Culicidae) complex in 23 sites in Cameroon, Central Africa. Almost all the specimens collected in the four northern-most and sites were Anopheles arabiensis. Anopheles melas was found in a rural locality surrounded by mangrove swamps, on the Atlantic Coast. In total, 1,525 An. gambiae s.s. females were identified down to their molecular form, and inversion polymorphisms on polytene chromosomes were scored from 186 half-gravid females. The Forest chromosomal form, with standard arrangements almost fixed on both arms of chromosome-2, was the only one observed in the southern, more humid localities. Karyotypes typical of Savanna and Mopti were recorded northwards, in the humid savannas of the Adamawa Province. The molecular forms M and S were widespread throughout Cameroon, and assort independently from the chromosomal forms. S-form populations were characterized by karyotypes typical of Forest and Savanna chromosomal forms, and M-form populations were characterized by karyotypes typical of Forest, Savanna, and Mopti. No M/S hybrid patterns were detected, although M and S mosquitoes were sympatric in 15 sites, providing further evidence for positive assortative mating within molecular forms. The observed ecogeographical distribution of M and S was peculiar: the ecological parameters involved in this distribution still need to be clarified as well as the possible role of competitive exclusion between chromosomally homosequential molecular forms. No difference was observed in host preference or in Plasinodium falciparum infection rates between sympatric M and S populations.

Item Type:	Article
Uncontrolled Keywords:	an. gambiae malaria cameroon chromosomal form molecular form west-africa genetic differentiation malaria transmission incipient speciation mosquitos mali identification arabiensis culicidae vectors
Subjects:	QU Biochemistry > Genetics > QU 470 Genetic structures QX Parasitology > Insects. Other Parasites > QX 515 Anopheles
Faculty: Department:	Groups (2002 - 2012) > Vector Group
Digital Object Identifer (DOI):	https://doi.org/10.1603/0022-2585(2005)042[0998:SAPOTA]2.0.CO;2
Depositing User:	Ms Julia Martin
Date Deposited:	29 Jul 2011 14:37
Last Modified:	13 Sep 2019 15:47
URI:	https://archive.lstmed.ac.uk/id/eprint/1923

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