Evaluation of Chemical and Physical-morphological Factors as Potential Determinants of Biomphalaria pfeifferi (Krauss, 1848) Distribution
| Autor: | Jürg Utzinger, Konstanze Mez, Marcel Tanner, C. Mayombana |
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| Rok vydání: | 1997 |
| Předmět: |
Microbiology (medical)
lcsh:Arctic medicine. Tropical medicine lcsh:RC955-962 Range (biology) water chemistry lcsh:QR1-502 Distribution (economics) Snail medicine.disease_cause physical-morphological factors Tanzania lcsh:Microbiology Biomphalaria pfeifferi schistosomiasis biology.animal parasitic diseases medicine Animals Biomphalaria biology business.industry Ecology Intermediate host Environmental factor Water biology.organism_classification Schistosomiasis mansoni Habitat Schistosoma mansoni business |
| Zdroj: | Memórias do Instituto Oswaldo Cruz., Vol 92, Iss 3, p 323 (1997) Memórias do Instituto Oswaldo Cruz., Vol 92, Iss 3, Pp 323-328 (1997) |
| ISSN: | 0074-0276 |
| DOI: | 10.1590/s0074-02761997000300004 |
| Popis: | 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 snails 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 a determinant for the absence of B. pfeifferi. In view of these findings, and those of previous studies, it is concluded that the focal distribution of B. pfeifferi cannot be associated with a single environmental factor and is rather the result of more complex interactions of habitat factors |
| Databáze: | OpenAIRE |
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