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Survival and dispersion of females of Aedes aegypti in Rio De Janeiro. Sobrevivência e dispersão de fêmeas de Aedes aegypti no Rio de Janeiro. Sobrevivência e dispersão de fêmeas de Aedes aegypti no Rio de Janeiro. Survival and dispersion of females of Aedes aegypti in Rio De Janeiro.

by de Freitas, Rafael Maciel

Abstract (Summary)
Ecological studies with Ae. aegypti are of extreme importance to better understand the vectorial capacity of natural populations and dengue transmission. In the present work, daily survival rates, longevity, dispersal and parity of Ae. aegypti females were estimated at a slum (Amorim) in the urban area and at a suburban district (Tubiacanga) in Rio de Janeiro, during the 2005 wet (Dec-Mar) and dry (Jun-Jul) seasons, by the use of mark, release and recapture method (MRR). The efficacy of a trap to collect Ae. aegypti (BGS-Trap) was also evaluated in the suburban area. In each MRR experiment, three mosquito cohorts marked with fluorescent dust of different colors were released and recaptured with backpack aspirators, BGS-Traps and sticky ovitraps. BGS-Trap captured significantly more Ae. aegypti males and females than the aspirator, which was more efficient to collect Culex quinquefasciatus. BGS-Traps captured more host-seeking females in detriment of females in other behavioral and physiological stages, and proved to be efficient trap for monitoring adult Ae. aegypti. Survivorship was estimated by fitting two alternative models: exponential and non-linear with correction for the removal of individuals. Recapture rates varied between 6.81 and 14.26%. In the urban area, higher survival, ranging between 0.827 and 0.942, and parity rates (68.5%) were observed. Parity rates did not differ between the wet and dry seasons in both areas. However, the parity rate in Amorim was significantly higher than in Tubiacanga. High daily survival rates reported for females point to higher lifespan and, thus, high vectorial capacity to transmit dengue virus. Females presented higher displacement in the suburban area, with a maximum distance traveled of 363m from the release point. Results suggest intense risk of dengue epidemics, particularly in the urban area. Ecological studies with Ae. aegypti are of extreme importance to better understand the vectorial capacity of natural populations and dengue transmission. In the present work, daily survival rates, longevity, dispersal and parity of Ae. aegypti females were estimated at a slum (Amorim) in the urban area and at a suburban district (Tubiacanga) in Rio de Janeiro, during the 2005 wet (Dec-Mar) and dry (Jun-Jul) seasons, by the use of mark, release and recapture method (MRR). The efficacy of a trap to collect Ae. aegypti (BGS-Trap) was also evaluated in the suburban area. In each MRR experiment, three mosquito cohorts marked with fluorescent dust of different colors were released and recaptured with backpack aspirators, BGS-Traps and sticky ovitraps. BGS-Trap captured significantly more Ae. aegypti males and females than the aspirator, which was more efficient to collect Culex quinquefasciatus. BGS-Traps captured more host-seeking females in detriment of females in other behavioral and physiological stages, and proved to be efficient trap for monitoring adult Ae. aegypti. Survivorship was estimated by fitting two alternative models: exponential and non-linear with correction for the removal of individuals. Recapture rates varied between 6.81 and 14.26%. In the urban area, higher survival, ranging between 0.827 and 0.942, and parity rates (68.5%) were observed. Parity rates did not differ between the wet and dry seasons in both areas. However, the parity rate in Amorim was significantly higher than in Tubiacanga. High daily survival rates reported for females point to higher lifespan and, thus, high vectorial capacity to transmit dengue virus. Females presented higher displacement in the suburban area, with a maximum distance traveled of 363m from the release point. Results suggest intense risk of dengue epidemics, particularly in the urban area.
This document abstract is also available in Portuguese.
Bibliographical Information:

Advisor:Ricardo Lourenco de Oliveira

School:Faculdades Oswaldo Cruz

School Location:Brazil

Source Type:Master's Thesis

Keywords:survival dispersion development ovaril Parity

ISBN:

Date of Publication:08/14/2006

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