Studies on mosquitoes (Diptera: Culicidae) and anthropic environment: 1- Parity of blood seeking Anopheles (Kerteszia) in South-Eastern Brazil

Abstract

FORATTINI, O.P. et al. Studies on mosquitoes (Diptera: Culicidae) and anthropic environment. 1-Parity of blood seeking Anopheles (Kerteszia) in South-Eastern Brazil. Rev. Saúde Pública, 27: 1-8, 1993. Populations of Anopheles (Kerteszia) were sampled fortnightly over a one-year period (August 1991 to July 1992) at Ribeira Valley, S. Paulo State, Brazil. Indoor and outdoor collections were made on human bait at evening crepuscular period. The Polovodova technique for age grading was applied to 3,501 females of Anopheles cruzii and to 416 females of An. bellator. That sample represented 34.4% of the total number of mosquitoes collected. The most abundant species found was An. cruzii. However, An. bellator showed an endophagy that was almost three times greater than that of An. cruzii. The overall parous rate was 25.4% and uniparity was practically dominant one. A proportion of 26.9% of An. cruzii and 12.0% of An. bellator were found to be uniparous. Only three outdoor females of the former species (0.1%) showed biparity. Parity of An. cruzii was higher in females caught indoors than in those caught outdoors. Nevertheless, 497 nulliparous females examined (417 cruzii and 80 bellator) had ovaries that had advanced to Christophers and Mer stages III to V. These results imply that these females had already practised hematophagy. Relating these results to those from the parous females, a high statistical significance was found, leading to the conclusion that gonothophic discordance is a common pattern among these anophelines. Further, these results obtained with human bait catches strongly suggest that nearly 38.0% of these host-seeking females had already taken at least one previous blood-meal. So it is possible that enough time could thus be available for the plasmodian development in the vectors.

Ecology of mosquitoes (Diptera: Culicidae) in areas of Serra do Mar State Park, State of São Paulo, Brazil. II - Habitat distribution

“…At most, as in our studies (Fig. 4), the incidences were restrict to the vicinities around the residence or to its interior solely for the purpose of a blood meal (Rachou 1946, Rachou et al 1958, Deane et al 1971, 1984, Forattini et al 1978b, 1993a, Gomes et al 1987, Azevedo 1997. Guimarães et al (1994) captured An.…”

“…Forattini et al (1968Forattini et al ( , 1978aForattini et al ( ,b, 1981Forattini et al ( , 1986aForattini et al ( ,b, 1987aForattini et al ( ,b, 1989Forattini et al ( , 1990Forattini et al ( , 1993aForattini et al ( ,b,c, 1995a, Guimarães et al (1989Guimarães et al ( , 1991Guimarães et al ( , 1992, Lopes (1996) and Ferreira (1997) approached the presence of these mosquitoes comparatively in two or more capture sites in the same region. However, the majority of these authors refer to the possible domiciliation processes that the mosquito fauna goes through toward co-habitation with man.…”

Role of Anopheles (Kerteszia) bellator as malaria vector in Southeastern Brazil (Diptera: Culicidae)

“…Early data regarding blood-seeking and general parity patterns have already been published (Forattini et al 1993(Forattini et al , 1996. According to these findings, despite there being no tendency towards resting within dwellings, both mosquitoes were present in man-made settlements.…”

“…bellator has not merited any special attention since the early observations of Rachou (1958). For this reason we undertook the present study, since earlier observations in the Ribeira Valley (Forattini et al 1993) indicated that this mosquito to exhibited a degree of endophily and endophagy.…”

Periodic dynamic systems for infected hosts and mosquitoes

“…The main motivation for the construction of the model here presented as well as the applications made was the recent studies by Forattini et al 4 on mosquitoes at an experimental rice irrigation system 5,6,7,8,9 .…”