Distribution spatiale et saisonnière des gîtes larvaires des moustiques dans les espaces agricoles de la zone de Mouila, Gabon

Koumba, Aubin Armel; Koumba, Christophe Roland Zinga; Nguema, Rodrigue Mintsa; Djogbénou, Luc; Ondo, Pyazzi Obame; Ketoh, Guillaume Koffivi; Comlan, Pearl; M’Batchi, Bertrand; Mavoungou, Jacques François

doi:10.4314/ijbcs.v12i4.19

Cited by 16 publications

(25 citation statements)

References 14 publications

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“…Anopheles gambiae adults have been observed to have maximum flight distances of 0.2 to 6.4 km [53]. Larval sources more distant from households may be responsible for risk but little evidence exists [54]. In support, in the SE, hamlet ownership increased malaria risk.…”

Section: Discussionmentioning

confidence: 99%

Variation in Anopheles distribution and predictors of malaria infection risk across regions of Madagascar

Arisco

Rice

Tantely

et al. 2020

Malar J

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Background Deforestation and land use change is widespread in Madagascar, altering local ecosystems and creating opportunities for disease vectors, such as the Anopheles mosquito, to proliferate and more easily reach vulnerable, rural populations. Knowledge of risk factors associated with malaria infections is growing globally, but these associations remain understudied across Madagascar’s diverse ecosystems experiencing rapid environmental change. This study aims to uncover socioeconomic, demographic, and ecological risk factors for malaria infection across regions through analysis of a large, cross-sectional dataset. Methods The objectives were to assess (1) the ecological correlates of malaria vector breeding through larval surveys, and (2) the socioeconomic, demographic, and ecological risk factors for malaria infection in four ecologically distinct regions of rural Madagascar. Risk factors were determined using multilevel models for the four regions included in the study. Results The presence of aquatic agriculture (both within and surrounding communities) is the strongest predictive factor of habitats containing Anopheles larvae across all regions. Ecological and socioeconomic risk factors for malaria infection vary dramatically across study regions and range in their complexity. Conclusions Risk factors for malaria transmission differ dramatically across regions of Madagascar. These results may help stratifying current malaria control efforts in Madagascar beyond the scope of existing interventions.

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Section: Discussionmentioning

confidence: 99%

Variation in Anopheles distribution and predictors of malaria infection risk across regions of Madagascar

Arisco

Rice

Tantely

et al. 2020

Malar J

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“…Il ressort ainsi que le nombre de gîtes artificiels en lien avec les activités anthropiques (briqueterie, cultures irriguées, etc.) sont relativement faibles contrairement à une étude similaire réalisée à Mouila (Sud-Ouest du Gabon) par Koumba et al (2018) qui ont dénombré 122 gîtes artificiels sur 178 recensés. Mais la particularité de ces gîtes artificiels est d'héberger en abondance des larves de culex et d'anophèles contrairement aux gîtes naturels.…”

Section: Discussionunclassified

“…Par contre, le nombre de gîtes positifs est plus élevé pendant la saison sèche qu'en saison des pluies. Des résultats similaires ont été obtenus par Gerard et al (2007), Sy et al (2016) et Koumba et al (2018) dans des régions similaires (péri-urbaines) qui ont observé de faibles proportions de gîtes positifs en saison des pluies contrairement en saison sèche. Cette faible proportion de gîtes positifs observée en saison des pluies, pourrait s'expliquer par les perturbations et le lessivage constants de ces gîtes par les pluies.…”

Section: Discussionunclassified

Mesures des indicateurs de prolifération des larves de moustiques au niveau des mares permanentes et semi permanentes de Saga, Niger

Iro¹,

Seydou²,

Doumma³

2020

Int. J. Bio. Chem. Sci

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Les Culicidae, communément appelés moustiques, par leur large distribution et leur abondance, sont impliqués dans la transmission de nombreuses maladies humaines et animales. La lutte contre ces insectes nécessite la connaissance de leurs lieux de développement dans lequel évoluent les stades pré imaginaux. La présente étude vise à caractériser ces gîtes larvaires en vue d’identifier les indicateurs entomologiques et écologiques de production de larves dans ces milieux. Pour ce faire, le pH, la température, la conductivité, la teneur en oxygène dissout et la densité larvaire des culicidae ont été estimés à la suite des prospections des gîtes larvaires effectuées de juillet 2007 à mars 2018 à Saga, un quartier périurbain de la Ville de Niamey. Au total, 17 gîtes ont été identifiés dont cinq (5) gîtes permanents (29,41%). Les surfaces d’eau artificielles ont été plus abondantes (64,71%). L’étude sur la caractérisation des gîtes par la méthode ACP (Analyse par Composantes Principales) a permis de grouper les gîtes en trois (3) catégories: le groupe 1 constitué par des gîtes qui présentent un pH légèrement acide (6,075 à 7,035) et un taux d’oxygène dissout élevé (1,11 à 2,32). Le groupe 2 qui est constitué par des gites qui présentent une conductivité plus élevée (compris entre 0,97 à 1,08) ainsi qu’un pH légèrement alcalin (7,51 à 7,83). Quant aux gîtes du groupe 3, ils appartiennent en effet, à une zone de transition ou les trois (3) paramètres sont élevés à savoir le pH (8,02 à 8,36), le taux d’oxygène dissout (1,43 mg/l à 2,54 mg/l) et de la conductivité (1170 μS/cm à 1370 μS/cm). L’étude a mis en évidence des affinités entre les espèces de moustiques et les conditions physico-chimiques des gîtes larvaires. C’est ainsi que An. gambiae s.l abonde dans les gîtes caractérisés par une température moins élevée, un pH neutre un taux d’oxygène dissout élevé alors que Culex pipens présente une affinité aux gîtes à forte conductivité et à taux d’oxygène dissout faible.Mots clès : Culicidae, Paramètres physico-chimiques, gîtes larvaires, Saga, Niger. English Title: Measurements of mosquito larvae proliferation indicators in the permanent and semi-permanent ponds of Saga, Niger Culicidae, commonly known as mosquitoes, by their wide distribution and abundance, are involved in the transmission of many human and animal diseases. The fight against these insects requires knowledge of their places of development in which the pre-imaginary stages evolve. The present study aims to characterize these breeding sites in order to identify entomological and ecological indicators of larval production in these environments. To do this, the pH, temperature, conductivity, dissolved oxygen content and larval density of culicidae were estimated following surveys of the breeding sites carried out from July 2007 to March 2018 in Saga, a peri-urban area of the City of Niamey. In total, 17 lodgings have been identified, including five (5) permanent lodgings (29.41%). Artificial water surfaces were more abundant (64.71%). The study on the characterization of the deposits by the ACP method (Principal Component Analysis) made it possible to group the deposits in three (3) categories: group 1 consisting of deposits that have a slightly acidic pH (6.075 to 7.035) and a high dissolved oxygen level (1.11 to 2.32). Group 2 which consists of gites which have a higher conductivity (0.97 to 1.08) as well as a slightly alkaline pH (7.51 to 7.83). As for the group 3 deposits, they indeed belong to a transition zone where the three (3) parameters are high, namely the pH (8.02 to 8.36), the dissolved oxygen level (1.43 mg / l to 2.54 mg / l) and conductivity (1170 μS / cm to 1370 μS / cm). The study highlighted affinities between mosquito species and the physicochemical conditions of the breeding sites. This is how An. Gambiae sl abounds in deposits characterized by a lower temperature, a neutral pH a high dissolved oxygen level while Culex pipens has an affinity for deposits with high conductivity and low dissolved oxygen rate.Keywords: Culicidae, Physico-chemical parameters, breeding sites, Saga, Niger.

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“…Anopheles gambiae adults have been observed to have maximum ight distances of 0.2 to 6.4km (55). Larval sources more distant from households may be responsible for risk but little evidence exists (56). In support, in the SE, hamlet ownership increased malaria risk.…”

Section: Discussionmentioning

confidence: 99%

Variation in Anopheles distribution and predictors of malaria infection risk across regions of Madagascar

Arisco

Rice

Tantely

et al. 2020

Preprint

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BackgroundDeforestation and land use change is widespread in Madagascar, altering local ecosystems and creating opportunities for disease vectors, such as the Anopheles mosquito, to proliferate and more easily reach vulnerable, rural populations. Knowledge of risk factors associated with malaria infections is growing globally, but these associations remain understudied across Madagascar’s diverse ecosystems experiencing rapid environmental change. This study aims to uncover socioeconomic, demographic, and ecological risk factors for malaria infection across regions through analysis of a large, cross-sectional dataset.MethodsHere, we assess (1) the ecological correlates of malaria vector breeding through larval surveys, and (2) the socioeconomic, demographic, and ecological risk factors for malaria infection in four ecologically distinct regions of rural Madagascar. We determine risk factors using multilevel models for the four regions included in the study.ResultsThe presence of aquatic agriculture (both within and surrounding communities) is the strongest predictive factor of habitats containing Anopheles larvae across all regions. We determine that ecological and socioeconomic risk factors for malaria infection vary dramatically across study regions and range in their complexity.ConclusionsRisk factors for malaria transmission differ dramatically across regions of Madagascar. These results may help stratifying current malaria control efforts in Madagascar beyond the scope of existing interventions.

show abstract

Distribution spatiale et saisonnière des gîtes larvaires des moustiques dans les espaces agricoles de la zone de Mouila, Gabon

Cited by 16 publications

References 14 publications

Variation in Anopheles distribution and predictors of malaria infection risk across regions of Madagascar

Variation in Anopheles distribution and predictors of malaria infection risk across regions of Madagascar

Mesures des indicateurs de prolifération des larves de moustiques au niveau des mares permanentes et semi permanentes de Saga, Niger

Variation in Anopheles distribution and predictors of malaria infection risk across regions of Madagascar

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