The distribution of two major malaria vectors, Anopheles gambiae and Anopheles arabiensis, in Nigeria

Onyabe, D. Y.; Conn, Jan E.

doi:10.1590/s0074-02762001000800009

Cited by 43 publications

(45 citation statements)

References 12 publications

(30 reference statements)

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“…arabiensis to drier conditions than An. gambiae s.s. (Coetzee et al, 2000;Onyabe and Conn, 2001;Kirby and Lindsay, 2004;Levine et al, 2004). The general association of this mosquito strain with river systems is illustrated by its positive association with the SWS index and NDVI.…”

Section: Discussionmentioning

confidence: 92%

“…gambiae s.l. species have been produced by displaying the relative frequency of species at sampled locations (Toure et al, 1998;Coetzee et al, 2000;Onyabe and Conn, 2001), by climatic suitability conditions of the species (Lindsay et al, 1998) and by ecological niche-modeling (Levine et al, 2004). The latter links vector data with climatic factors using artificial-intelligence algorithms.…”

Section: Introductionmentioning

confidence: 99%

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The spatial distribution of Anopheles gambiae sensu stricto and An. arabiensis (Diptera: Culicidae) in Mali

Sogoba

Vounatsou

Bagayoko³

et al. 2007

Geospat Health

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Abstract.Variations in the biology and ecology and the high level of genetic polymorphism of malaria vectors in Africa highlight the value of mapping their spatial distribution to enhance successful implementation of integrated vector management. The objective of this study was to collate data on the relative frequencies of Anopheles gambiae s.s. and An. arabiensis mosquitoes in Mali, to assess their association with climate and environmental covariates, and to produce maps of their spatial distribution. Bayesian geostatistical logistic regression models were fitted to identify environmental determinants of the relative frequencies of An. gambiae s.s. and An. arabiensis species and to produce smooth maps of their geographical distribution. The frequency of An. arabiensis was positively associated with the normalized difference vegetation index, the soil water storage index, the maximum temperature and the distance to water bodies. It was negatively associated with the minimum temperature and rainfall. The predicted map suggests that, in West Africa, An. arabiensis is concentrated in the drier savannah areas, while An. gambiae s.s. prefers the southern savannah and land along the rivers, particularly the inner delta of Niger. Because the insecticide knockdown resistance (kdr) gene is reported only in An. gambiae s.s. in Mali, the maps provide valuable information for vector control. They may also be useful for planning future implementation of malaria control by genetically manipulated mosquitoes.

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Section: Discussionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

The spatial distribution of Anopheles gambiae sensu stricto and An. arabiensis (Diptera: Culicidae) in Mali

Sogoba

Vounatsou

Bagayoko³

et al. 2007

Geospat Health

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“…Large areas of the country have no reliable data on the presence or absence of vectors and there is little information on sporozoite rates in southern Nigeria. 6,7 Most of the original information on the transmission of malaria in Nigeria comes from isolated and intermittent studies in the northern parts of the country, 8 In southern Nigeria, a few localized and short-term studies of mosquito populations were made 9 and more recently Awolola et al 7,8 studied population dynamics and biting behavior of anophelines in this area. Onyabe and Conn 10 reported the distribution of two major malaria vectors, An.…”

Section: Mots Clés: Malaria Vecteurs Falciparum De Plasmodium Dynamentioning

confidence: 99%

Transmission dynamics of malaria in four selected ecological zones of Nigeria in the rainy season

et al. 2009

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Background:Two of the problems of malaria parasite vector control in Nigeria are the diversity of Anopheline vectors and large size of the country. Anopheline distribution and transmission dynamics of malaria were therefore compared between four ecotypes in Nigeria during the rainy season. Methods: Polymerase chain reaction (PCR) was used in molecular identification after morphological identification microscopically. Enzyme linked immunorsorbent assay (ELISA) was used for the blood meal analysis and sporozoite detection. Results: Five species were identified out of 16,410 anophelines collected. An. gambiae s.s made up approximately 29.2%-36.6% of the population in each zone. All five species acted as vectors for P. falciparum. An. gambiae s.s had the highest sporozoite rate. The most infected mosquitoes were found in the rain forest. More blood meals were taken from bovids, except the savannah forest, where 73.3% were on humans and Human Blood index (HBI) was 57.3%. The Entomological inoculation rate (EIR) was a mean of 13.6 ib/p but was highest in the rainforest zone. Conclusions and limitations:This study demonstrates the complex distribution of anophelines and the considerable variations in the intensity of malaria transmission in Nigeria. We highlight the need to consider diverse epidemiological situations when planning countrywide control programmes. Key words: Malaria; vectors; Plasmodium falciparum; transmission dynamics; ecotypes RésuméFond: Deux des problèmes de la commande de vecteur de parasite de malaria au Nigéria sont la diversité des vecteurs d'Anopheline et grande taille du pays. La distribution d'Anopheline et la dynamique de transmission de la malaria ont été donc comparées entre quatre ecotypes au Nigéria pendant la saison des pluies. Méthodes: La réaction en chaîne de polymérase (PCR) a été employée dans l'identification moléculaire après identification morphologique au microscope. L'analyse immunorsorbent liée par enzyme (ELISA) a été employée pour la détection d'analyse et de sporozoite de repas de sang. Résultats: Cinq espèces ont été identifiées sur 16.410 anophelines rassemblés. gambiae s.s composés approximativement 29.2-36.6% de la population dans chaque zone. Chacune des cinq espèces a agi en tant que vecteurs pour P. falciparum. gambiae s.s a eu le taux de sporozoite le plus élevé. Les moustiques les plus infectés ont été trouvés dans la forêt tropicale . Plus de repas de sang ont été pris des bovids, excepté la forêt de la savane, où 73.3% étaient sur des humains et l'index humain de sang (HBI) était 57.3%. Le taux entomologique d'inoculation (EIR) était un moyen de 13.6 ib/p mais était le plus haut dans la zone de forêt tropicale.

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“…arabiensisare of the greatest medical importance in Nigeria [8] .Onyabe and conn in 2001 [7] disclosed that each of these two species were prevalent over the other in at least one locality in each of the five ecological zones of Nigeria and both species coexisted in several localities but in very disproportional numbers.On the distribution of the molecular forms across Nigeria,Onyabe and co-authors in 2003 [14] reported both S and M forms occurred across Nigeria with no apparent relationship to the ecological transition from the savannah to forest zones, and also stated that no hybrids between the two forms were detected. Okorie and co-authors in 2011 also reported on the distribution of M and S forms in the different ecological zones, but no mention of the hybrid form.…”

Section: Discussionmentioning

confidence: 99%

“…arabiensis are the two most important, efficient and widely distributed malaria vectors in Sub-Saharan Africa [4] Similar scenario plays out in Nigeria with these two major malaria vectors spread across the country's ecological zones [5] . Robust evidence abound of incipient speciation in Anopheles gambiae complex [6] [7] [8] [9] [10] [11].…”

Section: Introductionmentioning

confidence: 99%

Molecular Identification, Species Composition and Distribution Maps of Malaria Vector Species in SelectedCommunities in Benue State, North Central Nigeria.

Ameh¹

2017

IOSR JBB

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79%). There was a significant difference (P=0.001) between rural and urban communities in species composition at (P<0.05).A Polymerase Chain Reaction (PCR) assay identified two major species within the Anopheles gambiae complex; Anopheles gambiaes.s. and Anopheles arabiensis. Further identification using the Polymerase Chain Reaction-Restriction Fragment Length Polymorphisim (PCR-RFLP) revealed the presence of all three molecular forms (M,S,and H) of Anopheles gambiaes.s.; and for the first time detection of the hybrid form (H form).The distribution maps presented here highlights the existence and location of two members of the Anopheles gambiae complexand three members of the Anopheles gambiaes.s.

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The distribution of two major malaria vectors, Anopheles gambiae and Anopheles arabiensis, in Nigeria

Cited by 43 publications

References 12 publications

The spatial distribution of Anopheles gambiae sensu stricto and An. arabiensis (Diptera: Culicidae) in Mali

The spatial distribution of Anopheles gambiae sensu stricto and An. arabiensis (Diptera: Culicidae) in Mali

Transmission dynamics of malaria in four selected ecological zones of Nigeria in the rainy season

Molecular Identification, Species Composition and Distribution Maps of Malaria Vector Species in SelectedCommunities in Benue State, North Central Nigeria.

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