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Toxicity of cadmium and zinc to encystment and in vitro excystment of Parorchis acanthus (Digenea: Philophthalmidae)

Published online by Cambridge University Press:  10 January 2002

N.J. MORLEY ,
M. CRANE  and
J.W. LEWIS
N.J. MORLEY
Affiliation:
School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
M. CRANE
Affiliation:
School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
J.W. LEWIS
Affiliation:
School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
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Abstract

The toxicity of cadmium, zinc and cadmium/zinc mixtures at concentrations ranging from 1000 to 50000μg/l were investigated against cercariae and metacercariae of Parorchis acanthus obtained from the dog whelk Nucella lapillus. Cercarial encystment at concentrations of 25000μg/l or higher was significantly impaired by all test metals; however, at lower concentrations only zinc demonstrated toxicity. Mixtures of cadmium and zinc had a synergistic effect compared with single metal toxicity but only at 50000μg/l. Excystment in vitro was only significantly affected by cercariae exposed to cadmium/zinc mixtures whilst encysting. Twenty-four h exposures of fully formed cysts had no effect on excystment in vitro. Effects on in vitro excystment rates over a 2h period demonstrated widespread effects for cercariae-exposed P. acanthus. No effects were evident on excystment rates of cyst-exposed parasites.

Keywords

cadmiumzincencystmentcercariaeexcystment
Type
Research article
Information
Parasitology , Volume 122 , Issue 1 , January 2001 , pp. 75 - 79
Copyright
© 2001 Cambridge University Press

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