Section: Zoology
Topic: Genetics/Genomics, Population biology

Population genetics of Glossina fuscipes fuscipes from southern Chad

10.24072/pcjournal.257 - Peer Community Journal, Volume 3 (2023), article no. e31.

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In Subsaharan Africa, tsetse flies (genus Glossina) are vectors of trypanosomes causing Human African Trypanosomiasis (HAT) and Animal African Trypanosomosis (AAT). Some foci of HAT persist in Southern Chad, where a program of tsetse control was started against the local vector Glossina fuscipes fuscipes in the Mandoul focus in 2014, and in Maro in 2018. Flies were also sampled in 2018 in Timbéri and Dokoutou. We analyzed the population genetics of G. fuscipes fuscipes from the four tsetse-infested zones. The trapping samples were characterized by a strong female biased sex-ratio, except in Timbéri and Dokoutou that had high tsetse densities. Apparent density and effective population density appeared smaller in the main foci of Mandoul and Maro and the average dispersal distance (within the spatial scale of each zone) was as large as or larger than the total length of each respective zone. The genetic signature of a population bottleneck was found in the Mandoul and Timbéri area, suggesting a large ancient interconnected metapopulation that underwent genetic subdivision into small, isolated pockets due to adverse environmental conditions. The long-range dispersal and the existence of genetic outliers suggest a possibility of migration from remote sites such as the Central African Republic in the south (although the fly situation remains unknown there) and/or a genetic signature of recent exchanges. Due to likely isolation, an eradication strategy may be considered for sustainable HAT control in Mandoul focus. Another strategy will probably be required in Maro focus, which probably experiences much more exchanges with its neighbors.

Published online:
DOI: 10.24072/pcjournal.257
Type: Research article
Keywords: Tsetse flies, Dispersal, Trypanosomosis, Control, Polulation subdivision, Isolation by distance

Ravel, Sophie 1; Mahamat, Mahamat Hissène 2; Ségard, Adeline 1; Argilés-Herrero, Rafael 3; Bouyer, Jérémy 3; Rayaisse, Jean-Baptiste 4; Solano, Philippe 1; Guihini Mollo, Brahim 2; Pèka, Mallaye 5; Darnas, Justin 5; Belem, Adrien Marie Gaston 6; Yoni, Wilfrid 4; Noûs, Camille 7; De Meeûs, Thierry 1

1 Intertryp, IRD, Cirad, Univ Montpellier, Montpellier, France
2 Institut de Recherche en Elevage pour le Développement (IRED), Ndjaména, Tchad
3 Insect Pest Control Laboratory, Joint Food and Agriculture Organization of the United Nations/International Atomic Energy Agency Program of Nuclear Techniques in Food and Agriculture, A-1400, Vienna, Austria
4 Centre International de Recherche Développement sur l’Elevage en zone Subhumide (Cirdes), Bobo-Dioulasso, Burkina Faso
5 Programme National de Lutte contre la THA (PNLTHA), Ndjaména, Tchad
6 Université Nazi Boni, Bobo-Dioulasso, Burkina Faso
7 Cogitamus laboratory, France,
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
     author = {Ravel, Sophie and Mahamat, Mahamat Hiss\`ene and S\'egard, Adeline and Argil\'es-Herrero, Rafael and Bouyer, J\'er\'emy and Rayaisse, Jean-Baptiste and Solano, Philippe and Guihini Mollo, Brahim and  P\`eka, Mallaye and Darnas, Justin and Belem, Adrien Marie Gaston and Yoni, Wilfrid and No\^us, Camille and De Mee\^us, Thierry},
     title = {Population genetics of {\protect\emph{Glossina} fuscipes fuscipes} from southern {Chad}},
     journal = {Peer Community Journal},
     eid = {e31},
     publisher = {Peer Community In},
     volume = {3},
     year = {2023},
     doi = {10.24072/pcjournal.257},
     url = {}
AU  - Ravel, Sophie
AU  - Mahamat, Mahamat Hissène
AU  - Ségard, Adeline
AU  - Argilés-Herrero, Rafael
AU  - Bouyer, Jérémy
AU  - Rayaisse, Jean-Baptiste
AU  - Solano, Philippe
AU  - Guihini Mollo, Brahim
AU  -  Pèka, Mallaye
AU  - Darnas, Justin
AU  - Belem, Adrien Marie Gaston
AU  - Yoni, Wilfrid
AU  - Noûs, Camille
AU  - De Meeûs, Thierry
TI  - Population genetics of Glossina fuscipes fuscipes from southern Chad
JO  - Peer Community Journal
PY  - 2023
VL  - 3
PB  - Peer Community In
UR  -
DO  - 10.24072/pcjournal.257
ID  - 10_24072_pcjournal_257
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%0 Journal Article
%A Ravel, Sophie
%A Mahamat, Mahamat Hissène
%A Ségard, Adeline
%A Argilés-Herrero, Rafael
%A Bouyer, Jérémy
%A Rayaisse, Jean-Baptiste
%A Solano, Philippe
%A Guihini Mollo, Brahim
%A  Pèka, Mallaye
%A Darnas, Justin
%A Belem, Adrien Marie Gaston
%A Yoni, Wilfrid
%A Noûs, Camille
%A De Meeûs, Thierry
%T Population genetics of Glossina fuscipes fuscipes from southern Chad
%J Peer Community Journal
%D 2023
%V 3
%I Peer Community In
%R 10.24072/pcjournal.257
%F 10_24072_pcjournal_257
Ravel, Sophie; Mahamat, Mahamat Hissène; Ségard, Adeline; Argilés-Herrero, Rafael; Bouyer, Jérémy; Rayaisse, Jean-Baptiste; Solano, Philippe; Guihini Mollo, Brahim;  Pèka, Mallaye; Darnas, Justin; Belem, Adrien Marie Gaston; Yoni, Wilfrid; Noûs, Camille; De Meeûs, Thierry. Population genetics of Glossina fuscipes fuscipes from southern Chad. Peer Community Journal, Volume 3 (2023), article  no. e31. doi : 10.24072/pcjournal.257.

PCI peer reviews and recommendation, and links to data, scripts, code and supplementary information: 10.24072/pci.zool.100127

Conflict of interest of the recommender and peer reviewers:
The recommender in charge of the evaluation of the article and the reviewers declared that they have no conflict of interest (as defined in the code of conduct of PCI) with the authors or with the content of the article.

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