Effects of Age and Size on Anopheles gambiae s.s. Male Mosquito Mating Success

Sawadogo Simon P., Diabaté Abdoulaye, Toé Hyacinthe K., Sanon Antoine, Lefèvre Thierry, Baldet Thierry, Gilles Jérémie, Simard Frédéric, Gibson Gabriella, Sinkins Stevens, Dabiré Roch Kounbobr. 2013. Effects of Age and Size on Anopheles gambiae s.s. Male Mosquito Mating Success. Journal of Medical Entomology, 50 (2) : 285-293.

https://doi.org/10.1603/ME12041

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Quartile : Q1, Sujet : VETERINARY SCIENCES / Quartile : Q1, Sujet : ENTOMOLOGY

Résumé : Before the release of genetically-modiÞed or sterile male mosquitoes in an attempt to control local populations of malaria vectors, it is crucial to determine male traits involved in mating success. The effects of male size and age as determinants of male mating success in Anopheles gambiae s.s. were measured in the Þeld and under laboratory conditions in Burkina Faso. First, the body sizes (estimated by wing length) of mating, swarming, and indoor-resting male mosquitoes were compared over a 3-yr period (2006Ð2009) from July to October in Soumousso and Valle´e du Kou, two villages in western Burkina Faso. Second, the age structure of swarming and resting male mosquitoes were characterized based on the number of spermatocysts and the proportion of sperm in the reservoir of wild-caught male testis. Third, male age effects on the insemination rate of female An. gambiae were investigated in the laboratory. The mean size of males collected in copula was signiÞcantly larger than the mean for swarming males and indoor-resting males. The optimum male age for successful insemination of females was 4Ð8 d. These results suggest that male size is an important trait in determining male mating competitiveness in the Þeld. Although age was not found to be a signiÞcant factor in mating competitiveness, it was signiÞcantly correlated with swarming behaviors in the Þeld and insemination success in the laboratory.Theimplications of these results in terms of sexual selection in An. gambiae and vector control programs are further discussed.

Mots-clés Agrovoc : Anopheles gambiae, malaria, reproduction sexuée, performance de reproduction, comportement sexuel, compétition animale, âge, dimension, organisme génétiquement modifié

Mots-clés géographiques Agrovoc : Burkina Faso

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

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

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