Spatio-temporal analysis of host preferences and feeding patterns of malaria vectors in the sylvo-pastoral area of Senegal: impact of landscape classes

Particle and Fibre Toxicology

Ibrahima Dia²  Mawlouth Diallo²  Ousmane Faye¹  Lassana Konaté¹  Yamar Ba²  Jacques-André Ndione³  El Hadji Malick Ngom¹ 

[1] Laboratoire d’Ecologie Vectorielle et Parasitaire, Université Cheikh Anta Diop de Dakar, Dakar, Senegal;Unité d’Entomologie Médicale, Institut Pasteur de Dakar, 36 Avenue Pasteur, Dakar, BP 220, Sénégal;Centre de Suivi Ecologique, Dakar, Senegal

关键词: Pastoral area;    Blood meals;    Landscape classes;    Anthropophilic rates;    Trophic preferences;    An. gambiae s.l;   

Others  :  823805
DOI  :  10.1186/1756-3305-6-332

 received in 2013-07-29, accepted in 2013-11-14,  发布年份 2013

【 摘 要 】

Background

The study of vector feeding behaviour is an important step in the understanding of the epidemiology of vector borne diseases. The main objective of this work was to study the spatio-temporal host preferences and blood-feeding patterns of malaria vectors in a pastoral area of Senegal where cattle breeding is the main human activity.

Methods

Malaria vectors were collected indoors by pyrethrum spray catch in 16 villages belonging to 4 different landscape classes (wooded savanna, shrubby savanna, bare soils and steppe). Blood meals sources were determined using a direct enzyme-linked immunosorbent assay (ELISA).

Results

The blood meal origins of 1886 freshly fed An. gambiae s.l. were determined. Among these blood meals, most were taken on a single host: 40.1% on human and 37.1% on animal. The range in proportions of blood meals taken from human were 25–62.4% in wooded savanna villages, 23.5–61.9% in shrubby savanna villages, 31.3–70% in bare soils villages and 57.7–68.7 in steppe villages. Blood meals taken from bovines were very heterogeneous with two clusters localized in the Northeast and Southwest axis of the study area that corresponds to the distribution of the main water ponds. Patent mixed blood meals taken from human and non-human were significantly higher than those taken from two animals, the highest proportions being observed in September (shrubby savanna, bare soils and steppe villages) or October (wooded savanna villages).

Conclusions

These observations suggest that in this pastoral area, differences in feeding patterns of malaria vectors are merely linked to the specific localization of villages and are not influenced by landscape class distribution. In addition, the temporal variations in the anthropophilic rates are influenced by the presence of standing water in the study area.

【 授权许可】

   
2013 Ngom et al.; licensee BioMed Central Ltd.

【 图 表 】

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