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DAILY SURVIVAL RATES AND DISPERSAL OF AEDES AEGYPTI FEMALES IN RIO DE JANEIRO, BRAZIL

Daily survival rates, life expectancy, dispersal, and parity are important components of vectorial capacity of Aedes aegypti. These parameters were estimated for mosquito populations from a slum and a suburban district in Rio de Janeiro, during the wet and dry seasons in 2005. In each mark-release-recapture experiment, three cohorts of dust-marked Ae. aegypti females were released. Recaptures were carried out daily in randomly selected houses, using backpack aspirators, adult traps, and sticky ovitraps. Recapture varied between 6.81% and 14.26%. Daily survival was estimated by fitting two alternative models: exponential and nonlinear models with correction for the removal of individuals. Slum area presented higher survival and parity rates (68.5%). Dispersal rates were higher in the suburban area, where a maximum dispersal of 363 m was observed. Results suggest intense risk of dengue epidemic, particularly in the urban area.

Received January 26, 2006. Accepted for publication June 24, 2006.

Acknowledgments: We thank Gláuber Rocha, Kleber Soares, Marcelo Celestino dos Santos, Marcelo Quintela Gomes, Mauro Menezes Muniz, Reginaldo Rego, Renato Carvalho, Roberto Costa Peres, and Sérgio Cunha for field assistance. We also thank Dr Álvaro Eiras for allowing the use of BG-Sentinels and the comments of two anonymous referees that improved this manuscript quality.

Financial support: This study was supported by FAPERJ, CNPq, and Fiocruz.

^* Address correspondence to Rafael Maciel-de-Freitas, Laboratório de Transmissores de Hematozoários, PavilhaóCarlos Chagas, 4° andar sala 04, Departamento de Entomologia, Rio de Janeiro, Brazil 21040-360. E-mail: freitas{at}ioc.fiocruz.br

Authors’ addresses: R. Maciel-de-Freitas and R. Lourenço-de-Oliveira, Laboratório de Transmissores de Hematozoários, Pav. Carlos Chajas, 4° andar, Sala 04, Departamento de Entomologia. CEP: 21040-360. FundaçaóOswaldo Cruz, Fiocruz, Rio de Janiero, Brazil. E-mails: freitas{at}ioc.fiocruz.br, lourenco{at}ioc.fiocruz.br. C. T. Codeço, Programa de ComputacóCientifica, Fundaçao Oswaldo Cruz, Fiocruz, Rio de Janiero, Brazil. CEP: 21040-360. E-mail: codeco{at}fiocruz.br.

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