Toxicity of cadmium and zinc to encystment and in vitro excystment of Parorchis acanthus (Digenea: Philophthalmidae)
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 signif...
| Published in: | Parasitology |
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| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Cambridge University Press (CUP)
2001
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1017/s0031182000007095 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0031182000007095 |
| Summary: | 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. |
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