Analyse cytogénétique du complexe<i>Anopheles gambiae</i>dans la région de Bobo-Dioulasso (Burkina Faso)

Petrarca, V.; Coriat, Pierre; Ovazza, L.; Cóluzzi, M.

doi:10.1051/parasite/1989644290

Cited by 29 publications

(16 citation statements)

References 6 publications

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“…Mopti population forms were dominant in permanent waters in the irrigated area, whereas savannah forms were dominant in temporary shallow waters of lowland and rocky highland areas. This finding is similar to observations in some parts of Burkina Faso where the M form was common in the centre of rice fields, but at the edges of irrigated areas, the S form was more dominant (Robert et al. 1989).…”

Section: Discussionsupporting

confidence: 90%

Malaria transmission dynamics at a site in northern Ghana proposed for testing malaria vaccines

Appawu

Owusu‐Agyei

Dadzie

et al. 2004

Tropical Med Int Health

131

118

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SummaryWe studied the malaria transmission dynamics in Kassena Nankana district (KND), a site in northern Ghana proposed for testing malaria vaccines. Intensive mosquito sampling for 1 year using human landing catches in three micro-ecological sites (irrigated, lowland and rocky highland) yielded 18 228 mosquitoes. Anopheles gambiae s.l. and Anopheles funestus constituted 94.3% of the total collection with 76.8% captured from the irrigated communities. Other species collected but in relatively few numbers were Anopheles pharoensis (5.4%) and Anopheles rufipes (0.3%). Molecular analysis of 728 An. gambiae.s.l. identified Anopheles gambiae s.s. as the most dominant sibling species (97.7%) of the An. gambiae complex from the three ecological sites. Biting rates of the vectors (36.7 bites per man per night) were significantly higher (P < 0.05) in the irrigated area than in the non-irrigated lowland (5.2) and rocky highlands (5.9). Plasmodium falciparum sporozoite rates of 7.2% (295/4075) and 7.1% (269/3773) were estimated for An. gambiae s.s. and An. funestus, respectively. Transmission was highly seasonal, and the heaviest transmission occurred from June to October. The intensity of transmission was higher for people in the irrigated communities than the non-irrigated ones. An overall annual entomological inoculation rate (EIR) of 418 infective bites was estimated in KND. There were microecological variations in the EIRs, with values of 228 infective bites in the rocky highlands, 360 in the lowlands and 630 in the irrigated area. Approximately 60% of malaria transmission in KND occurred indoors during the second half of the night, peaking at daybreak between 04.00 and 06.00 hours. Vaccine trials could be conducted in this district, with timing dependent on the seasonal patterns and intensity of transmission taking into consideration the micro-geographical differences and vaccine trial objectives.

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Section: Discussionsupporting

confidence: 90%

Malaria transmission dynamics at a site in northern Ghana proposed for testing malaria vaccines

Appawu

Owusu‐Agyei

Dadzie

et al. 2004

Tropical Med Int Health

131

118

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“…gambiae to man is indicated not only by its specific man biting and indoor resting behaviour but also by its peculiar heliophilic (Coluzzi, Petrarca & Di Deco, 1985). Within this process, the Mopti chromosomal form appears to be one of the most recent evolutionary steps in view of its association with dry season irrigation Coluzzi, 1983, 1987 andin preparation;Petrarca et al, 1986;Robert et al, 1989;Akogbeto et al, 19.92). The recent origin of the taxon is also supported by its distribution which is limited to the upper Niger River basin and does not (yet) extend to other ecologically suitable irrigated dry areas, neither westward to the Senegal and Gambia river basins nor eastward to the lake Chad zone and to the Nile River basin (Bryan et al, 1982;Petrarca et al, 1986;Petrarca, Vercruysse & Coluzzi, 1987;Petrarca et al, in preparation Tour6 et al,in preparation).…”

Section: Discussionmentioning

confidence: 95%

“…Such ecological flexibility of An. gambiae Mopti has been attributed to its 2R inversion polymorphism bc/u/+ (Tour6, Petrarca & Coluzzi, 1983Petrarca et al, 1986;Robert et al, 1989).…”

Section: Introductionmentioning

confidence: 98%

Ecological genetic studies in the chromosomal form Mopti ofAnopheles gambiae s.str. in Mali, West Africa

et al. 1994

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Among the sibling species of the Afrotropical Anopheles gambiae complex, the nominal taxon (An. gambiae s.str.) is the major malaria vector. Its bionomics suggest a man-dependent speciation process which involves, in West Africa, various incipient species chromosomally recognized by different combinations of 2R paracentric inversions. One of the most recent evolutionary steps of such a speciation process appears to be the chromosomal form Mopti, which is associated with dry season irrigation in arid zones, and is characterized by a remarkable ecological flexibility related to three 2R alternative arrangements, namely bc, u and +, whose expected karyotypes are found in Hardy-Weinberg equilibrium. The study of this chromosomal polymorphism in samples from a 16-locality transect in Mali shows wide variations and highly significant correlation with both temporal and spatial climatic differences. Mosquitoes homokaryotypic for 2Rbc are the actual dry season and arid areas breeders. The regular rise of 2Rbc frequency, up to fixation, during each dry season, corresponds to the South-North clinal increase of the same arrangement along the transect, from about 30% in the humid savanna to near fixation in the South-Saharan zone. This coherent ecological genetics case provides full support to the hypothesis of the adaptive nature of paracentric inversions. Moreover, the very peculiar system of combinations of contiguous 2R inversions, utilized by Mopti as well as by other chromosomal forms of An. gambiae, suggests a process of polygenic reorganization based on linkage disequilibria and involving the inversions as driving selection units.

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“…La nuisance culicidienne causée par les moustiques du genre Culex a fréquemment été signalée dans le processus d'urbanisation des grandes cités africaines [22,26,30]. Les densités agressives d'A.…”

Section: Discussionunclassified

Pratiques agricoles et épidémiologie du paludisme en zone soudano-sahélienne du Cameroun

Atangana

Fomena

Tamesse

et al. 2012

Bull. Soc. Pathol. Exot.

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We have comparatively studied the dynamics of malaria transmission in the villages of Mokolo-Douvar located in the rural area with traditional agriculture and Gounougou irrigated rice area, in 2004 August and November and 2006 May and October, to assess vectors biting habits, and malaria inoculation rate and malaria parasite prevalence in cohort of children from 0 to 15 years. Mosquitoes were collected by landing catches on volunteers and by pyrethrum spray collections. A total of 5961 Anopheles were collected. Seven Anopheles species were identified: Anopheles gambiae s.s., Anopheles arabiensis, Anopheles funestus, Anopheles pharoensis, Anopheles rufipes, Anopheles ziemanni and Anopheles squamosus. A. arabiensis was the major species (56.2%) and the main malaria vector in both study sites, followed by A. funestus (32.6%). Malaria transmission was high in the irrigated area of Gounougou (1.42 infection bites per man per night) whereas in the non-irrigated zone of Mokolo-Douvar, it was below detection level during the rainy season (0,245 ib/h/n). In Gounougou, a total of 655 children were examined. The mean plasmodic index was 21.1%. Our findings confirm that changes in irrigated rice agriculture influence malaria transmission dynamics, and call for control measures that are readily adapted to local eco-epidemiological settings.

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Analyse cytogénétique du complexeAnopheles gambiaedans la région de Bobo-Dioulasso (Burkina Faso)

Cited by 29 publications

References 6 publications

Malaria transmission dynamics at a site in northern Ghana proposed for testing malaria vaccines

Malaria transmission dynamics at a site in northern Ghana proposed for testing malaria vaccines

Ecological genetic studies in the chromosomal form Mopti ofAnopheles gambiae s.str. in Mali, West Africa

Pratiques agricoles et épidémiologie du paludisme en zone soudano-sahélienne du Cameroun

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