Abstract
A study of Spissipes Section of Culex (Melanoconion) adults behaviour was carried out from August 1992 through December 1993 in human dominated (anthropic) environment in the Ribeira Valley, S. Paulo State, Brazil. By sampling at several sites it the dominance of Culex ribeirensis and Cx. sacchettae became evident even through a total number of ten species was recorded. Those two mosquitoes showed a clear tendency to frequent the domiciliary environment where they were caught, both indoor and outdoor, through the use of the human bait. In the outside environments, the residual patchy forests seems to display a concentration role, from which these adults spread to the open land and reach the dwellings. As their vector competence has been demonstrated through the virus isolations in natural conditions, it is advisable to pay attention to the presence of these mosquitoes in the man-made environment.
Highlights
As it is well known Culex (Melanoconion) are nocturnal mosquitoes of the Americas, inhabiting mainly forest environments and most active at dusk and dawn
In Argentina, several bunyaviruses have been isolated from Culex delpontei and Cx. ocossa besides alphaviruses represented by strains of the Venezuelan equine encephalitis (VEE) and the western equine encephalitis (WEE) viruses (Calisher3, 1985; Mitchell et al.20,21, 1985, 1987)
Cx. ribeirensis and Cx. sacchettae jointly accounted for 95.9% of the Spissipes Section specimens collected
Summary
As it is well known Culex (Melanoconion) are nocturnal mosquitoes of the Americas, inhabiting mainly forest environments and most active at dusk and dawn. They feed on the blood of vertebrates including humans, when available. Their competence to transmit various arboviruses has been demonstrated both through isolations from naturally infected mosquitoes and laboratory transmission trials. They are considered as important vectors of arboviruses in their sylvan natural cycle, specially the group of the Spissipes Section. The proportion of the isolations from these Melanoconion mosquitoes presages the incrimination species of that Section as important vectors of arboviruses
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