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Cercarial tail loss in Echinostoma caproni: the influence of in vivo encystment and copper sulphate

Published online by Cambridge University Press:  12 April 2024

B. Fried  and
J.L. Schneck
B. Fried*
Affiliation:
Department of Biology, Lafayette College, Easton, Pennsylvania 18042, USA
J.L. Schneck
Affiliation:
Department of Biology, Lafayette College, Easton, Pennsylvania 18042, USA
*
*Fax: 610 330 5705 Email: friedb@lafayette.edu
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Abstract

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Echinostoma caproni tail loss was studied in vitro in the presence of the toxicant copper sulphate (CuSO4) in concentrations ranging from 1 to 10 000 mg l?1 in standardized artificial spring water (pH 7.4, osmolarity 34 mOsm kg?1 H2O, Ca2+ 20 mg l?1) at 23°C. Tail loss was also studied in the absence of toxicants during in vivo encystment of the cercariae in juvenile Biomphalaria glabrata. As the concentration of CuSO4 increased, the percentage of cercarial tail loss increased. By 2 h in 10 000 mg l?1, 1000 mg l?1 and 100 mg l?1 CuSO4, 50%, 23% and 13%, respectively, of the cercariae had lost their tails. In the in vivo studies, by 1 h PI, 59±5% of cercariae had lost their tails and only 4±1% of the cercariae were actively swimming in the multi-well dishes. At 3 h PI, 72±3% of the cercariae began to form cysts within the snails.

Type
Review Article
Information
Journal of Helminthology , Volume 79 , Issue 2 , June 2005 , pp. 177 - 178
Copyright
Copyright © Cambridge University Press 2005

References

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