The population structure of Glossina palpalis gambiensis from Island and Continental locations in Coastal Guinea

Solano Philippe, Ravel Sophie, Bouyer Jérémy, Camara Mamadou, Kagbadouno Moise S., Dyer Naomi, Gardes Laëtitia, Herault Damien, Donnelly Martin J., De Meeus Thierry. 2009. The population structure of Glossina palpalis gambiensis from Island and Continental locations in Coastal Guinea. PLoS Neglected Tropical Diseases, 3 (3):e392, 9 p.

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

Résumé : Background: We undertook a population genetics analysis of the tsetse fly Glossina palpalis gambiensis, a major vector of sleeping sickness in West Africa, using microsatellite and mitochondrial DNA markers. Our aims were to estimate effective population size and the degree of isolation between coastal sites on the mainland of Guinea and Loos Islands. The sampling locations encompassed Dubre´ka, the area with the highest Human African Trypanosomosis (HAT) prevalence in West Africa, mangrove and savannah sites on the mainland, and two islands, Fotoba and Kassa, within the Loos archipelago. These data are discussed with respect to the feasibility and sustainability of control strategies in those sites currently experiencing, or at risk of, sleeping sickness. Principal Findings: We found very low migration rates between sites except between those sampled around the Dubre´ka area that seems to contain a widely dispersed and panmictic population. In the Kassa island samples, various effective population size estimates all converged on surprisingly small values (10,Ne,30) that suggest either a recent bottleneck, and/or other biological or ecological factors such as strong variance in the reproductive success of individuals. Conclusion/Significance: Whatever their origin, the small effective population sizes suggest high levels of inbreeding in tsetse flies within the island samples in marked contrast to the large diffuse deme in Dubre´ka zones. We discuss how these genetic results suggest that different tsetse control strategies should be applied on the mainland and islands.

Mots-clés Agrovoc : Glossina palpalis, trypanosomose, ruminant

Mots-clés géographiques Agrovoc : Guinée

Mots-clés complémentaires : Glossina palpalis gambiensis

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

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

Auteurs et affiliations

• Solano Philippe, IRD (BFA)
• Ravel Sophie, IRD (FRA)
• Bouyer Jérémy, CIRAD-BIOS-UPR Contrôle des maladies (BFA) ORCID: 0000-0002-1913-416X
• Camara Mamadou, PNLTHA (GIN)
• Kagbadouno Moise S., PNLTHA (GIN)
• Dyer Naomi, Liverpool School of Tropical Medicine (GBR)
• Gardes Laëtitia
• Herault Damien, Limagrain Verneuil (FRA)
• Donnelly Martin J., Liverpool School of Tropical Medicine (GBR)
• De Meeus Thierry, CNRS (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/549428/)

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