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Role of the repartition of wetland breeding sites on the spatial distribution of Anopheles and Culex, human disease vectors in Southern France

Cailly Priscilla, Balenghien Thomas, Ezanno Pauline, Fontenille Didier, Toty Céline, Tran Annelise. 2011. Role of the repartition of wetland breeding sites on the spatial distribution of Anopheles and Culex, human disease vectors in Southern France. Parasites and Vectors, 4 (65), 8 p.

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Quartile : Q2, Sujet : PARASITOLOGY

Résumé : Background: In this study, carried out in the Camargue region (France), we combined entomological data with geomatic and modelling tools to assess whether the location of breeding sites may explain the spatial distribution of adult mosquitoes. The species studied are important and competent disease vectors in Europe: Culex modestus Ficalbi and Cx. pipiens Linnaeus (West Nile virus), Anopheles atroparvus Van Thiel, a former Plasmodium vector, and An. melanoon Hackett, competent to transmit Plasmodium. Using a logistic regression model, we first evaluated which land cover variables determined the presence of Culex and Anopheles larva. The resulting probability map of larval presence then was used to project the average probability of finding adults in a buffer area. This was compared to the actual number of adults collected, providing a quantitative assessment of adult dispersal ability for each species. Results: The distribution of Cx. modestus and An. melanoon is mainly driven by the repartition of irrigated farm fields and reed beds, their specific breeding habitats. The presence of breeding sites explained the distribution of adults of both species. The buffer size, reflecting the adult dispersal ability, was 700 m for Cx. modestus and 1000 m for An. melanoon. The comparatively stronger correlation observed for Cx. modestus suggested that other factors may affect the distribution of adult An. melanoon. We did not find any association between Cx. pipiens larval presence and the biotope due to the species' ubiquist character. Conclusion: By applying the same method to different species, we highlighted different strengths of association between land cover (irrigated farm fields and reed beds), larval presence and adult population distribution. This paper demonstrates the power of geomatic tools to quantify the spatial organization of mosquito populations, and allows a better understanding of links between landcover, breeding habitats, presence of immature mosquito populations and adult distributions for different species.

Mots-clés Agrovoc : Anopheles, Culex, Culex pipiens, végétation, facteur du milieu, épidémiologie

Mots-clés géographiques Agrovoc : Provence-Alpes-Côte d'Azur, France

Mots-clés complémentaires : Culex modestus

Mots-clés géographiques complémentaires : Camargue

Classification Agris : L72 - Organismes nuisibles des animaux
U30 - Méthodes de recherche
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : Axe 4 (2005-2013) - Santé animale et maladies émergentes

Auteurs et affiliations

  • Cailly Priscilla, INRA (FRA)
  • Balenghien Thomas, CIRAD-BIOS-UMR CMAEE (FRA)
  • Ezanno Pauline, INRA (FRA)
  • Fontenille Didier, IRD (FRA)
  • Toty Céline, IRD (FRA)
  • Tran Annelise, CIRAD-ES-UPR AGIRs (FRA) ORCID: 0000-0001-5463-332X

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/560358/)

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