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Environmental heterogeneity drives tsetse fly population dynamics and control

View ORCID ProfileHélène Cecilia, Sandie Arnoux, View ORCID ProfileSébastien Picault, Ahmadou Dicko, Momar Talla Seck, Baba Sall, Mireille Bassène, Marc Vreysen, Soumaïla Pagabeleguem, Augustin Bancé, Jérémy Bouyer, View ORCID ProfilePauline Ezanno
doi: https://doi.org/10.1101/493650
Hélène Cecilia
1BIOEPAR, INRA, Oniris, CS40703, 44307 Nantes, France
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  • ORCID record for Hélène Cecilia
Sandie Arnoux
1BIOEPAR, INRA, Oniris, CS40703, 44307 Nantes, France
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Sébastien Picault
1BIOEPAR, INRA, Oniris, CS40703, 44307 Nantes, France
2Univ. Lille, CNRS, Centrale Lille, UMR9189 CRIStAL, Lille, France
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  • ORCID record for Sébastien Picault
Ahmadou Dicko
3Unité Mixte de Recherche ASTRE ‘Animal, Santé, Territoires, Risques et Ecosystèmes’, Campus international de Baillarguet, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), 34398 Montpellier, France
4ASTRE, University of Montpellier, CIRAD, INRA, Montpellier, France
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Momar Talla Seck
5Institut Sénégalais de Recherches Agricoles, Laboratoire National d’Elevage et de Recherches Vétérinaires, Dakar-Hann, Sénégal
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Baba Sall
6Direction des Services vétérinaires, Ministère de l’Elevage et des Productions animales, Sphères ministérielles de Diamniadio, Bât. C, 3ème étage, Sénégal
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Mireille Bassène
5Institut Sénégalais de Recherches Agricoles, Laboratoire National d’Elevage et de Recherches Vétérinaires, Dakar-Hann, Sénégal
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Marc Vreysen
7Insect Pest Control Laboratory, Joint FAO/IAEA Programme of Nuclear Techniques in Food and Agriculture, 1400 Vienna, Austria
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Soumaïla Pagabeleguem
8Insectarium de Bobo-Dioulasso – Campagne d’Eradication des Tsé-tsé et Trypanosomoses (IBD-CETT), Bobo-Dioulasso 01 BP 1087, Burkina Faso
9Université de Dédougou (UDDG), BP 176, Burkina Faso
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Augustin Bancé
10Centre International de Recherche-Développement sur l’Elevage en Zone Subhumide (CIRDES), Bobo-Dioulasso 01 01 BP. 454, Burkina Faso
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Jérémy Bouyer
3Unité Mixte de Recherche ASTRE ‘Animal, Santé, Territoires, Risques et Ecosystèmes’, Campus international de Baillarguet, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), 34398 Montpellier, France
4ASTRE, University of Montpellier, CIRAD, INRA, Montpellier, France
7Insect Pest Control Laboratory, Joint FAO/IAEA Programme of Nuclear Techniques in Food and Agriculture, 1400 Vienna, Austria
11Unité Mixte de Recherche ‘Interactions hôtes-vecteurs-parasites-environnement dans les maladies tropicales négligées dues aux trypanosomatides’, CIRAD, Montpellier, France
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Pauline Ezanno
1BIOEPAR, INRA, Oniris, CS40703, 44307 Nantes, France
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  • ORCID record for Pauline Ezanno
  • For correspondence: pauline.ezanno@inra.fr
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Abstract

A spatially and temporally heterogeneous environment may lead to unexpected population dynamics. Knowledge still is needed on which of the local environment properties favour population maintenance at larger scale. For pathogen vectors, such as tsetse flies transmitting human and animal African trypanosomosis, such a knowledge is crucial to design relevant management strategies. We developed an original mechanistic spatio-temporal model of tsetse fly population dynamics, accounting for combined effects of spatial complexity, density-dependence, and temperature on the age-structured population, and parametrized with field and laboratory data. We confirmed the strong impact of temperature and adult mortality on tsetse populations. We showed that the coldest cells with the smallest variations in temperature acted as refuges when adult mortality was homogeneously increased, control being less effective in such refuges. In contrast, optimizing control by targeting the cells contributing the most to population management resulted in a decline in population size with a similar efficacy, but resulted in more dispersed individuals, control efficacy being no longer related to temperature. Population resurgence after control was slow, but could be very high locally in refuges. Situations were highly contrasted after a heterogeneous control, refuges being located at the interface between controlled and uncontrolled zones. Our results highlighted the importance of baseline data collection to characterize the targeted ecosystem before any control measure is implemented.

Footnotes

  • This paper is recommended by PCI Ecology.

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Posted June 11, 2019.
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Environmental heterogeneity drives tsetse fly population dynamics and control
Hélène Cecilia, Sandie Arnoux, Sébastien Picault, Ahmadou Dicko, Momar Talla Seck, Baba Sall, Mireille Bassène, Marc Vreysen, Soumaïla Pagabeleguem, Augustin Bancé, Jérémy Bouyer, Pauline Ezanno
bioRxiv 493650; doi: https://doi.org/10.1101/493650
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Environmental heterogeneity drives tsetse fly population dynamics and control
Hélène Cecilia, Sandie Arnoux, Sébastien Picault, Ahmadou Dicko, Momar Talla Seck, Baba Sall, Mireille Bassène, Marc Vreysen, Soumaïla Pagabeleguem, Augustin Bancé, Jérémy Bouyer, Pauline Ezanno
bioRxiv 493650; doi: https://doi.org/10.1101/493650

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