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Genetic comparison of Glossina tachinoides populations in three river basins of the Upper West Region of Ghana and implications for tsetse control

Adam Yahaya, Bouyer Jérémy, Dayo Guiguigbaza-Kossigan, Mahama Charles I., Vreysen Marc J.B., Cecchi Giuliano, Abd-Alla Adly M.M., Solano Philippe, Ravel Sophie, De Meeus Thierry. 2014. Genetic comparison of Glossina tachinoides populations in three river basins of the Upper West Region of Ghana and implications for tsetse control. Infection, Genetics and Evolution, 28 : pp. 588-595.

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Quartile : Q2, Sujet : INFECTIOUS DISEASES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Anthropologie-Ethnologie

Abstract : Tsetse flies are the cyclical vectors of African animal trypanosomosis (AAT) and human African trypanosomosis (HAT). In March 2010, the Government of Ghana initiated a large scale integrated tsetse eradication campaign in the Upper West Region (UWR) (_18,000 km2) under the umbrella of the Pan-African Tsetse and Trypanosomosis Eradication Campaign (PATTEC). We investigated the structuring of Glossina tachinoides populations within and between the three main river basins of the target area in the UWR. Out of a total sample of 884 flies, a sub-sample of 266 was genotyped at nine microsatellite loci. The significance of the different hierarchical levels was tested using Yang's parameters estimated with Weir and Cockerham's method. A significant effect of traps within groups (pooling traps no more than 3 km distant from each other), of groups within river basins and of river basins within the whole target area was observed. Isolation by distance between traps was highly significant. A local density of 0.48-0.61 flies/m2 was estimated and a dispersal distance that approximated 11 m per generation [CI 9, 17]. No significant sex-biased dispersal was detected. Dispersal distances of G. tachinoides in the UWR were relatively low, possibly as a result of the fragmentation of the habitat and the seasonality of the Kulpawn and Sissili rivers. Moreover, very high fly population densities were observed in the sample sites, which potentially reduces dispersal at constant habitat saturation, because the probability that migrants can established is reduced (density dependent dispersal). However, the observed spatial dispersal was deemed sufficient for a G. tachinoides-cleared area to be reinvaded from neighboring populations in adjacent river basins. These data corroborate results from other population genetics studies in West Africa, which indicate that G. tachinoides populations from different river basins cannot be considered isolated. (Résumé d'auteur)

Mots-clés Agrovoc : Glossina tachinoides, Glossinidae, Trypanosoma, Génotype, Dynamique des populations, Méthode statistique, Vecteur de maladie, Capture animale, Distribution géographique, Échantillonnage

Mots-clés géographiques Agrovoc : Ghana

Classification Agris : L72 - Pests of animals
L73 - Animal diseases

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

  • Adam Yahaya, Veterinary services department (GHA)
  • Bouyer Jérémy, CIRAD-BIOS-UMR CMAEE (SEN) ORCID: 0000-0002-1913-416X
  • Dayo Guiguigbaza-Kossigan, CIRDES (BFA)
  • Mahama Charles I., Veterinary services department (GHA)
  • Vreysen Marc J.B., AIEA (AUT)
  • Cecchi Giuliano, FAO (ITA)
  • Abd-Alla Adly M.M., AIEA (AUT)
  • Solano Philippe, IRD (BFA)
  • Ravel Sophie, IRD (FRA)
  • De Meeus Thierry, CNRS (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/574497/)

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