Behavioural divergence of sympatric Anopheles funestus populations in Burkina Faso

Malaria Journal

Research

N’Fale Sagnon¹  Wamdaogo M Guelbeogo¹  Fang Liu²  Nora J Besansky³  Carlo Costantini⁴ 

[1] Centre National de Recherche et de Formation sur le Paludisme, BP 2208, Ouagadougou 01, Burkina Faso;Department of Applied and Computational Mathematics and Statistics, University of Notre Dame, 46556, Notre Dame, IN, USA;Eck Institute for Global Health, Department of Biological Sciences, University of Notre Dame, 46556, Notre Dame, IN, USA;Institut de Recherche pour le Développement (IRD), Unité Mixte de Recherche MIVEGEC (UM1, UM2, CNRS 5290, IRD 224), Centre IRD de Montpellier 956, BP 64501, Avenue Agropolis, 34394, Montpellier Cedex 5, France;

关键词: Anopheles funestus;    Anthropophily;    Behavioural divergence;    Chromosomal forms;    Exophily;    Folonzo;    Kiribina;    Malaria vector;    West Africa;   

DOI  :  10.1186/1475-2875-13-65

 received in 2014-01-21, accepted in 2014-02-20,  发布年份 2014

来源: Springer

【 摘 要 】

BackgroundIn Burkina Faso, two chromosomal forms of the malaria vector Anopheles funestus, Folonzo and Kiribina, are distinguished by contrasting frequencies of shared polymorphic chromosomal inversions. Sympatric and synchronous populations of Folonzo and Kiribina mate assortatively, as indicated by a significant deficit of heterokaryotypes, and genetic associations among inversions on independently segregating chromosome arms. The present study aimed to assess, by intensive longitudinal sampling, whether sympatric Folonzo and Kiribina populations are characterized by behavioural differences in key malaria vectorial parameters.MethodsThe study was conducted in two adjacent villages near Ouagadougou, in the dry savanna of central Burkina Faso. Mosquito adult resting behaviour of both forms was compared based on parallel indoor/outdoor collections across six breeding seasons; 8,235 fully karyotyped samples of half-gravid females were analysed in total. Additionally, indoor/outdoor human biting behaviour, host selection, and Plasmodium falciparum sporozoite rate was assessed and compared between chromosomal forms.ResultsThe Kiribina form was numerically predominant in the area. However, the Folonzo form was significantly over-represented in indoor resting collections and showed stronger post-prandial endophily, while Kiribina predominated outdoors. Neither form was statistically distinguishable in human biting behaviour, and both were more likely to seek human blood meals indoors than outside. The human blood index and sporozoite rate were comparably high in both chromosomal forms in indoor collections (>89% and >8%, respectively).ConclusionsBoth Kiribina and Folonzo chromosomal forms are formidable malaria vectors in Burkina Faso. However, the significantly greater tendency for the Kiribina form to rest outdoors despite its pronounced anthropophily suggests that uniform exposure of the overall An. funestus population to indoor-based vector control tools cannot be expected; Kiribina is more likely to evade indoor interventions and escape unharmed outdoors, reducing the efficacy of malaria control. Accordingly, more efficient methods to detect Kiribina and Folonzo, and a more complete understanding of their distribution and behaviour in Africa are advocated.

【 授权许可】

CC BY   
© Guelbeogo et al.; licensee BioMed Central Ltd. 2014