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Modelling temporal dynamics of Culicoides Latreille (Diptera: Ceratopogonidae) populations on Reunion Island (Indian Ocean), vectors of viruses of veterinary importance

Authors
  • Grimaud, Yannick1, 2, 3
  • Guis, Hélène4, 5, 6, 7
  • Chiroleu, Frédéric8
  • Boucher, Floriane3, 5
  • Tran, Annelise3, 5, 9, 10
  • Rakotoarivony, Ignace5, 11
  • Duhayon, Maxime5, 11
  • Cêtre-Sossah, Catherine3, 5
  • Esnault, Olivier1
  • Cardinale, Eric3, 5
  • Garros, Claire3, 5
  • 1 GDS Réunion, 1 rue du Père Hauck, La Plaine des Cafres, La Réunion, 97418, France , La Plaine des Cafres (France)
  • 2 University of Reunion Island, 15 avenue René Cassin, Sainte-Clotilde, La Réunion, 97715, France , Sainte-Clotilde (France)
  • 3 CIRAD, UMR ASTRE, Sainte-Clotilde, La Réunion, 97490, France , Sainte-Clotilde (France)
  • 4 CIRAD, UMR ASTRE, Antananarivo, 101, Madagascar , Antananarivo (Madagascar)
  • 5 ASTRE, University of Montpellier, CIRAD, INRA, Montpellier, France , Montpellier (France)
  • 6 Institut Pasteur of Madagascar, Antananarivo, Madagascar , Antananarivo (Madagascar)
  • 7 FOFIFA DRZVP, Antananarivo, Madagascar , Antananarivo (Madagascar)
  • 8 CIRAD, UMR PBVMT, Saint-Pierre, La Réunion, 97410, France , Saint-Pierre (France)
  • 9 CIRAD, UMR TETIS, Sainte-Clotilde, La Réunion, 97490, France , Sainte-Clotilde (France)
  • 10 TETIS, University of Montpellier, Montpellier, France , Montpellier (France)
  • 11 CIRAD, UMR ASTRE, Montpellier, 34398, France , Montpellier (France)
Type
Published Article
Journal
Parasites & Vectors
Publisher
Springer (Biomed Central Ltd.)
Publication Date
Nov 27, 2019
Volume
12
Issue
1
Identifiers
DOI: 10.1186/s13071-019-3812-1
Source
Springer Nature
Keywords
License
Green

Abstract

BackgroundReunion Island regularly faces outbreaks of epizootic haemorrhagic disease (EHD) and bluetongue (BT), two viral diseases transmitted by haematophagous midges of the genus Culicoides (Diptera: Ceratopogonidae) to ruminants. To date, five species of Culicoides are recorded in Reunion Island in which the first two are proven vector species: Culicoides bolitinos, C. imicola, C. enderleini, C. grahamii and C. kibatiensis. Meteorological and environmental factors can severely constrain Culicoides populations and activities and thereby affect dispersion and intensity of transmission of Culicoides-borne viruses. The aim of this study was to describe and predict the temporal dynamics of all Culicoides species present in Reunion Island.MethodsBetween 2016 and 2018, 55 biweekly Culicoides catches using Onderstepoort Veterinary Institute traps were set up in 11 sites. A hurdle model (i.e. a presence/absence model combined with an abundance model) was developed for each species in order to determine meteorological and environmental drivers of presence and abundance of Culicoides.ResultsAbundance displayed very strong heterogeneity between sites. Average Culicoides catch per site per night ranged from 4 to 45,875 individuals. Culicoides imicola was dominant at low altitude and C. kibatiensis at high altitude. A marked seasonality was observed for the three other species with annual variations. Twelve groups of variables were tested. It was found that presence and/or abundance of all five Culicoides species were driven by common parameters: rain, temperature, vegetation index, forested environment and host density. Other parameters such as wind speed and farm building opening size governed abundance level of some species. In addition, Culicoides populations were also affected by meteorological parameters and/or vegetation index with different lags of time, suggesting an impact on immature stages. Taking into account all the parameters for the final hurdle model, the error rate by Normalized Root mean Square Error ranged from 4.4 to 8.5%.ConclusionsTo our knowledge, this is the first study to model Culicoides population dynamics in Reunion Island. In the absence of vaccination and vector control strategies, determining periods of high abundance of Culicoides is a crucial first step towards identifying periods at high risk of transmission for the two economically important viruses they transmit.

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