Spatio-temporal modelling of Culicoides Latreille (Diptera: Ceratopogonidae) populations on Reunion Island (Indian Ocean)

Grimaud Yannick, Tran Annelise, Benkimoun Samuel, Boucher Floriane, Esnault Olivier, Cetre-Sossah Catherine, Cardinale Eric, Garros Claire, Guis Hélène. 2021. Spatio-temporal modelling of Culicoides Latreille (Diptera: Ceratopogonidae) populations on Reunion Island (Indian Ocean). Parasites and Vectors, 14:288, 16 p.

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

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

Résumé : Background: Reunion Island regularly faces outbreaks of bluetongue and epizootic hemorrhagic diseases, two insect borne orbiviral diseases of ruminants. Hematophagous midges of the genus Culicoides (Diptera: Ceratopogo nidae) are the vectors of bluetongue (BTV ) and epizootic hemorrhagic disease (EHDV ) viruses. In a previous study, statistical models based on environmental and meteorological data were developed for the five Culicoides species present in the island to provide a better understanding of their ecology and predict their presence and abundance. The purpose of this study was to couple these statistical models with a Geographic Information System (GIS) to pro duce dynamic maps of the distribution of Culicoides throughout the island. Methods: Based on meteorological data from ground weather stations and satellite derived environmental data, the abundance of each of the five Culicoides species was estimated for the 2214 husbandry locations on the island for the period ranging from February 2016 to June 2018. A large scale Culicoides sampling campaign including 100 farms was carried out in March 2018 to validate the model.Results:According to the model predictions, no husbandry location was free of Culicoides throughout the study period. The five Culicoides species were present on average in 57.0% of the husbandry locations for C.bolitinosMeiswinkel, 40.7% for C.enderleini Cornet & Brunhes, 26.5% for C.grahamii Austen, 87.1% for C.imicola Kieffer and 91.8% for C.kibatiensis Goetghebuer. The models also showed high seasonal variations in their distribution. During the validation process, predictions were acceptable for C.bolitinos, C.enderleini and C.kibatiensis, with normalized root mean square errors (NRMSE) of 15.4%, 13.6% and 16.5%, respectively. The NRMSE was 27.4% for C.grahamii. For C.imicola, the NRMSE was acceptable (11.9%) considering all husbandry locations except in two specific areas, the Cirque de Salazie—an inner mountainous part of the island—and the sea edge, where the model overestimated its abundance. Conclusions: Our model provides, for the first time to our knowledge, an operational tool to better understand and predict the distribution of Culicoides in Reunion Island. As it predicts a wide spatial distribution of the five Culi-coides species throughout the year and taking into consideration their vector competence, our results suggest that BTV and EHDV can circulate continuously on the island. As further actions, our model could be coupled with an epidemiological model of BTV and EHDV transmission to improve risk assessment of Culicoides borne diseases on the island.

Mots-clés Agrovoc : vecteur de maladie, Culicoides, analyse spatiale, distribution des populations, modélisation, fièvre catarrhale ovine, virus bluetongue

Mots-clés géographiques Agrovoc : La Réunion, France

Mots-clés complémentaires : modélisation spatio-temporelle

Mots-clés libres : Culicoides, Spatio-temporal modelling, Ocelet, Reunion Island, Bluetongue, Epizootic hemorrhagic disease

Classification Agris : L72 - Organismes nuisibles des animaux
L20 - Écologie animale
L60 - Taxonomie et géographie animales

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

Auteurs et affiliations

• Grimaud Yannick, GDS Réunion (REU) - auteur correspondant
• Tran Annelise, CIRAD-ES-UMR TETIS (REU) ORCID: 0000-0001-5463-332X
• Benkimoun Samuel, Université de Montpellier (FRA)
• Boucher Floriane, Université de Montpellier (FRA)
• Esnault Olivier, GDS Réunion (REU)
• Cetre-Sossah Catherine, CIRAD-BIOS-UMR ASTRE (FRA)
• Cardinale Eric, CIRAD-BIOS-UMR ASTRE (REU) ORCID: 0000-0002-3434-3541
• Garros Claire, CIRAD-BIOS-UMR ASTRE (FRA) ORCID: 0000-0003-4378-5031 - auteur correspondant
• Guis Hélène, CIRAD-BIOS-UMR ASTRE (MDG)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/598415/)

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