Hostname: page-component-78c5997874-dh8gc Total loading time: 0 Render date: 2024-11-04T18:56:48.457Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)