Estudo de quatro espécies de Lutzomyia França, 1924 (Diptera, Psychodidae), em área endêmica de Leishmaniose Tegumentar Americana a periferia de Manaus (Amazonas - Brasil)

Abstract

The occurence of four sandfly speciea, previously recognized as Leishmania vectors, was studied during one and a half seasonal cycles, from April, 1988 until September, 1989 ; Lutzomyia umbratilis Ward & Fraiha, 1977, L-anduzei (Rozeboom,1942), L, flaviecutellata (Mangabeira, 1942) and L. olmeca nociva Young & Arias, 1982, in Cidade Nova, one endemic area of cutaneoue leishmaniasis, in environs of Manaus, Amazonae state, Brazil. That analysed sandflies were captured on tree-trunk bases, Disney traps and CDC light traps at three heights abova the floor in a forest environment, around the housee with CDC light traps at only one leve1 above the floor, and ineide six houses in two places, one in an old human settlement, and another in a recent, collectinp on the inside, and outside walls. The total number of sandflies collected was 10.478 specimens belonging to 44 different agecies. The seasonal distribution, sex ratio and ovary rigness, blood meale, flagellate infection and Leishmania infection rate were studied, in the four eandflieer vector speciee. A relationship wars found between the eeaaonal distribution of these four apeciea and the rain period of the region. L. umbratilie was predorninant in a11 places of the study. It also predominated among a11 species collected and also among the four analysed apecies, also being the unique speciers from which we could isolate LeishPania. Acording to the result from kDNA hybridization this isolate was from the braailieneis comglex, and other characteristica euggest that it wae grobably Leiehnania (V.) guyane118is Floch, 1954. The results for each species are discussed in relation to the explored environmenta and the collection strategies, and considering environmental diaturbancea and the persistence of disease in the area.