The influence of salinity on the ova and miracidia of three species of Schistosoma |
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Authors: | F A Donnelly C C Appleton C H Schutte |
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Institution: | Research Institute for Diseases in a Tropical Environment, South African Medical Research Council, P.O. Box 17120, Congella 4013, Republic of South Africa |
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Abstract: | Donnelly P. A., Apleton C. C. and Schutte C. H. J. 1984. The influence of salinity on the ova and miracidia of three species of Schistosoma. International Journal for Parasitology14: 113–120. The effect of salinity on the hatchability of the ova and the longevity and infectivity of the miracidia of schistosoma mattheei, Schistosoma haematobium and Schistosoma mansoni was determined. Complete inhibition of hatching of ova occurred in an upper salinity of 14%, whilst salinities < 3.5% did not significantly affect hatchability (p > 0.05). Miracidial survival decreased progressively in salinities? 7 %. However, in salinities of 1.75% and 3.5%, survival was significantly greater than in fresh water (p ? 0.05), although this did not appear to infer an increase in infectivity. Miracidia of S. mattheei and S. mansoni were capable of establishing mature infections in salinities of up to 3.5%. only and S. haematobium in ? 2.5%. Differences in the salinity tolerance of the ova and miracidia of the three species were discussed. |
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Keywords: | ova miracidia longevity infectivity salinity |
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