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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 102, No. 8, 2007, pp. 975-982
Bioline Code: oc07174
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 102, No. 8, 2007, pp. 975-982

 en Diverse population dynamics of three Anopheles species belonging to the Triannulatus Complex (Diptera: Culicidae)
Silva-do-Nascimento, Teresa Fernandes & Lourenço-de-Oliveira, Ricardo

Abstract

The Triannulatus Complex of Anopheles ( Nyssorhynchus) check for this species in other resources consists of at least three sibling species, namely Anopheles triannulatus check for this species in other resources s.s., Anopheles halophylus check for this species in other resources and a third undescribed member herein referred to as An. triannulatus "C". Sympatric anophelines belonging to species complexes, even though closely related, may exploit different environments such as larval habitats. In this paper we hypothesize that rainfall and seasonal flooding would distinctly influence the availability of larval habitats and consequently the seasonal population dynamics of sympatric members of the Triannulatus Complex. A reflection of this is distinct seasonal biting frequencies exhibited by three members of the Triannulatus Complex at a site in Central Brazil. Population dynamics seem to be influenced by the water level in the local rivers, although biting frequency of all three species was negatively influenced by rainfall. An. triannulatus s.s. was more abundant following the end of the rainy season, but notably 30 to 60 days after flooding. On the other hand, An. halophylus and An. triannulatus C peaked during the middle of the dry season, when water impoundments have no inflow, are somewhat reduced in size and the water becomes brackish. Differences in population dynamics were greater between An. triannulatus s.s. and An. halophylus and An. triannulatus C than between An. halophylus and An. triannulatus C. This might reflect differences in larval habitat exploitation and therefore spatial segregation among these members of the complex.

Keywords
Anopheles triannulatus - Anopheles halophylus - Triannulatus Complex - seasonal frequency

 
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