Evaluation of chemical and physical-morphological factors as potencial determinants of Biomphalaria pfeifferi (Krauss, 1848) distribution
Mem. Inst. Oswaldo Cruz
;
92(3): 323-8, May-Jun. 1997. mapas, tab, graf
Artículo
en Inglés
| LILACS
| ID: lil-189301
RESUMO
This study was carried out in five sites along a small perennial river system in south-central Tanzania, which had been identified as the focus for transmission of intestinal schistosomiasis in the area. Malacological surveys preceding the study showed a focal distribution of Biomphalaria pfeifferi, intermediate host snail of Schistosoma mansoni, the snail being present in three sites but absent from the other two sites. The objective of this study was to evaluate to what extent chemical and/or physical-morphological factors determine the distribution of B. pfeifferi between these five sites. It was found that none of the chemical constituents in the waters examined were outside the tolerance range of B. pfeifferi snails. Moreover, the composition of water from B. pfeifferi-free sites was not different from that in those sites where snails occurred. Furthermore, none of the physical-morphological constituents seemed likely to be determinant for the absence of B. pfeifferi. In view of these findings, and those of previous studies, it is concluded that the focal distribuition of B. pfeifferi cannot be associated with a single environmental factor and is rather the result of more complex interactions of habitat factors.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Biomphalaria
Tipo de estudio:
Estudio pronóstico
Límite:
Animales
País/Región como asunto:
Africa
Idioma:
Inglés
Revista:
Mem. Inst. Oswaldo Cruz
Asunto de la revista:
Medicina Tropical
/
Parasitología
Año:
1997
Tipo del documento:
Artículo
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