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FACTORS CONDITIONING THE HABITAT AND THE DENSITY OF BIOMPHALARIA TENAGOPHILA (ORBIGNY, 1835) IN AN ISOLATED SCHISTOSOMIASIS FOCUS IN RIO DE JANEIRO CITY
Esquistossomose
Biomphalaria tenagophila
Jardim de agrião
Fatores Ambientais
Affilliation
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Biologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Biologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Biologia. Rio de Janeiro, RJ, Brasil.
Abstract
The present work was carried out in a watercress garden in Alto da Boa Vista, in the city of Rio de Janeiro, Brazil. The investigation was carried out in two phases. The first one (1985-86) involved the sampling of Biomphalaria tenegophila in two areas to determine its relative populational densities. The results showed that the populations presented similar densities and dynamics. The second phase (1988-89) involved the study of the influence of some environmental factors on the establishment of B. tenagophila in watercress garden. Two factors were identified as responsible for the establishment of B. tenagophila in the garden: (1) the quality of the water entering the irrigation system, to which domestic sewage is added, and (2) alterations in the nature of the substrate, due to inadequate fertilization techniques, which employ organic matter from adjacent pigsties. Aquatic plants and hydrological parameters of the irrigation system were subsidiary factors to the establishment of B. tenagophila in the garden.
Keywords in Portuguese
EcologiaEsquistossomose
Biomphalaria tenagophila
Jardim de agrião
Fatores Ambientais
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