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Spatio-temporal variation of biting flies, Stomoxys spp. (Diptera: Muscidae), along a man-made disturbance gradient, from primary forest to the city of Makokou (North-East, Gabon)

Authors

  • J.-F. MAVOUNGOU,

    Corresponding author
    1. Département de Biologie, Faculté des Sciences, Université des Sciences et Techniques de Masuku (USTM), Franceville, Gabon
    • Département d’écologie animale, Institut de Recherche en Ecologie Tropicale (IRET), Libreville, Gabon
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  • N. PICARD,

    1. Département d’écologie animale, Institut de Recherche en Ecologie Tropicale (IRET), Libreville, Gabon
    2. Tropical Forest Goods and Ecosystem services Research unit, Centre International de la Recherche Agronomique et de Développement (CIRAD), Montpellier, France
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  • L. T. KOHAGNE,

    1. Département d’écologie animale, Institut de Recherche en Ecologie Tropicale (IRET), Libreville, Gabon
    2. Département de Biologie, Faculté des Sciences, Université des Sciences et Techniques de Masuku (USTM), Franceville, Gabon
    3. Département de biologie et physiologie animale, Faculté des Sciences, Université de Yaoundé I, Yaounde, Cameroun
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  • B. M'BATCHI,

    1. Département de Biologie, Faculté des Sciences, Université des Sciences et Techniques de Masuku (USTM), Franceville, Gabon
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  • J. GILLES,

    1. Insect Pest Control Laboratory, FAO/IAEA Agriculture and Biotechnology Laboratories, Seibersdorf, Austria
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  • G. DUVALLET

    1. Equipe Ecologie des Arthropodes et changement globaux (EACG), Centre d'Ecologie Fonctionnelle et Evolutive (CEFE), Montpellier, France
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Jacques F. Mavoungou, Département d’écologie animale, Institut de Recherche en Ecologie Tropicale (IRET), BP: 13354 Libreville-Gabon. Tel.: 00 241 07 44 41 70; Fax: 00241 73 25 78; E-mail: mavoungoujacques@yahoo.fr

Abstract

Understanding the pattern of abundance of vector populations is important to control the potential of transmission of associated pathogens. The pattern of abundance of Stomoxys Geoffroy, an ubiquitous blood-sucking fly, is poorly known in tropical Africa. In this study, we investigated the spatio-temporal pattern of abundance of the Stomoxys genus along a gradient of man-made disturbance in north-eastern Gabon. Three sites (one in primary forest, one in secondary forest and one in a man-made environment) were monitored during 13 months using Vavoua traps. Seven species and subspecies were found to live in sympatry, but with distinct patterns of abundance with respect to space and time. The most abundant species was Stomoxys transvittatus Villeneuve, whereas the rarest species was S. xanthomelas Roubaud. Stomoxys calcitrans Linné was preferentially found in man-made environments, whereas S. xanthomelas was preferentially found in primary forest. Stomoxys abundance was the greatest in secondary forest, then in man-made environments and finally in primary forest. A seasonal variation in Stomoxys abundance was also found. In conclusion, forest degradation and deforestation are likely both to favour the concentration of populations of Stomoxys, and to change the specific composition of the Stomoxys community.

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