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Trematode–gastropod associations in nine non-lacustrine habitats in the Mwanza region of Tanzania

Published online by Cambridge University Press:  08 November 2011

E. S. Loker ,
H. G. Moyo  and
S. L. Gardner
E. S. Loker
Affiliation:
Department of Zoology, Oregon State University, Corvallis, Oregon 97331
H. G. Moyo
Affiliation:
Institute for Medical Research, P.O. Box 1462, Mwanza, Tanzania
S. L. Gardner
Affiliation:
Department of Zoology, Oregon State University, Corvallis, Oregon 97331
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Summary

Between August 1978 and July 1979, freshwater gastropods were collected at monthly intervals from 9 different non-lacustrine habitats in the Mwanza region of Tanzania. Of a total of 11708 gastropods representing 14 species, 1748 (14–9%) were infected with trematode sporocysts and/or rediae. Altogether 38 morphologically distinguishable ‘species’ of cercariae were recovered (13 furcocercous, 10 xiphidiocercaria, 6 echin-ostome, 4 cystophorous, 3 gymnocephalous and 2 amphistome species), 22 of which did not conform to previously described African species. The majority (63–8%) of all mature infections were xiphidiocercariae. Biomphalaria pfeifferi, B. sudanica and Ceratophallus natalensis each yielded 11 species of cercariae. Lymnaea natalensis had the highest overall prevalence of infection (36–9%). Cercaria guttera from L. natalensis accounted for 20–4% of all recovered trematode infections and C. blukwa from Biomphalaria accounted for 18–4% of all infections; the high prevalence of these two xiphidiocercariae may alter the transmission patterns of Fasciola gigantica and Schistosoma mansoni, respectively. S. mansoni was recovered from both B. sudanica (22 of 2393 infected) and B. pfeifferi (79 of 1913 infected); S. haematobium (or related species) was recovered from Bulinus (Physopsis) nasutus (50 of 1503 infected) and to a lesser extent from B. (P.) africanus (6 of 186 infected). The findings are discussed in relation to the biological control of trematode diseases in Tanzania.

Type
Research Article
Information
Parasitology , Volume 83 , Issue 2 , October 1981 , pp. 381 - 399
Copyright
Copyright © Cambridge University Press 1981

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