Only one species? Cryptic diversity and spatial distribution of Culicoides obsoletus sensu lato (Diptera: Ceratopogonidae) in Europe

Tabourin Laura, Gardes Laëtitia, Rakotoarivony Ignace, Mathieu Bruno, Balenghien Thomas, Baldet Thierry, Garros Claire, Huber Karine. 2017. Only one species? Cryptic diversity and spatial distribution of Culicoides obsoletus sensu lato (Diptera: Ceratopogonidae) in Europe. In : Sove 2017 New technology conquering old vectors?. Miranda Chueca (ed.), Miguel Ángel (ed.), Alten, Bulent (ed.). Palma de Mallorque : SOVE, Résumé, 230. ISBN 978-84-697-6086-4 International SOVE congress: New technology conquering old vectors?. 7, Palma de Mallorque, Espagne, 1 Octobre 2017/7 Octobre 2017.

Résumé : Vector competence studies and virus detection in Culicoides populations have highlighted the role of Culicoides obsoletus as main vector species of bluetongue and Schmallenberg viruses in the Palearctic region. Culicoides obsoletus is a well-described species, recorded in sympatry with an undistinguishable species, C. scoticus, and other morphologically closely related species, C. chiopterus, C. dewulfi, and C. montanus. Recently, several authors have reported the existence of cryptic diversity within the usually called C. obsoletus. This raises the question of the taxonomic validity of this newly reported diversity, its spatial distribution and eventually the specificity of the molecular diagnostic tools. This is of main importance to assess the epidemiological role of all the valid taxa. In this study, we molecularly identified 1300 C. obsoletus s.l. specimens from 11 countries in Europe. The phylogenetic reconstruction confirmed the existence of at least three undescribed species within C. obsoletus s.s. (C. obsoletus #O2, C. obsoletus #dark and a yet undetermined species) and reported the existence of two clades within C. scoticus. A distribution map of these species gives a first insight of the European spatial distribution of the different species within C. obsoletus s.l. This work shows the importance of taxonomic reassessment of vector species and the constant evaluation of diagnostic molecular tools at regional level. (Texte integral)

Classification Agris : L72 - Organismes nuisibles des animaux
L73 - Maladies des animaux

Auteurs et affiliations

• Tabourin Laura
• Gardes Laëtitia, CIRAD-BIOS-UMR ASTRE (FRA)
• Rakotoarivony Ignace, CIRAD-BIOS-UMR ASTRE (FRA)
• Mathieu Bruno, IPPTS (FRA)
• Balenghien Thomas, CIRAD-BIOS-UMR ASTRE (MAR)
• Baldet Thierry, CIRAD-BIOS-UMR ASTRE (FRA) ORCID: 0000-0003-2979-9517
• Garros Claire, CIRAD-BIOS-UMR ASTRE (REU) ORCID: 0000-0003-4378-5031
• Huber Karine, INRA (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/585777/)

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