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

Grimaud Yannick, Guis Hélène, Chiroleu Frédéric, Boucher Floriane, Tran Annelise, Rakotoarivony Ignace, Duhayon Maxime, Cetre-Sossah Catherine, Esnault Olivier, Cardinale Eric, Garros Claire. 2019. Modelling temporal dynamics of Culicoides Latreille (Diptera: Ceratopogonidae) populations on Reunion Island (Indian Ocean), vectors of viruses of veterinary importance. Parasites and Vectors, 12:562, 17 p.

Url - jeu de données - Dataverse Cirad : https://doi.org/10.18167/DVN1/LUFIF6

Quartile : Q1, Sujet : TROPICAL MEDICINE / Quartile : Q1, Sujet : PARASITOLOGY

Résumé : Background: Reunion 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. Methods: Between 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. Results: Abundance 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%. Conclusions: To 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.

Mots-clés Agrovoc : vecteur de maladie, épizootie, Culicoides, surveillance épidémiologique

Mots-clés géographiques Agrovoc : La Réunion, France

Mots-clés libres : Culicoides, Temporal dynamics, Hurdle model, Reunion Island, Bluetongue, Epizootic hemorrhagic disease, Indian ocean

Classification Agris : L73 - Maladies des animaux
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Auteurs et affiliations

• Grimaud Yannick, CIRAD-BIOS-UMR ASTRE (REU) - auteur correspondant
• Guis Hélène, CIRAD-BIOS-UMR ASTRE (MDG)
• Chiroleu Frédéric, CIRAD-BIOS-UMR PVBMT (REU) ORCID: 0000-0002-4874-5357
• Boucher Floriane, CIRAD-BIOS-UMR ASTRE (REU)
• Tran Annelise, CIRAD-ES-UMR TETIS (REU) ORCID: 0000-0001-5463-332X
• Rakotoarivony Ignace, CIRAD-BIOS-UMR ASTRE (FRA)
• Duhayon Maxime, CIRAD-BIOS-UMR ASTRE (FRA)
• Cetre-Sossah Catherine, CIRAD-BIOS-UMR ASTRE (REU)
• Esnault Olivier, GDS Réunion (REU)
• Cardinale Eric, CIRAD-BIOS-UMR ASTRE (REU) ORCID: 0000-0002-3434-3541
• Garros Claire, CIRAD-BIOS-UMR ASTRE (REU) ORCID: 0000-0003-4378-5031 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/594241/)

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