Abstract
Polychaete worms (Hediste diversicolor) originating from a strongly metal-contaminated area (Restronguet Creek) and a relatively clean site (Blackwater estuary) were exposed to a range of experimental doses of Ag, Cd, Cu and Zn. Specimens from both populations were compared to assess their relative sensitivity to metal stress and the physiological mechanisms involved in their respective adaptive strategies for coping with increased metal exposures. Taking into account the LC50 values, increased tolerance to Cd, Cu and Zn of the Restronguet Creek worms over that of the Blackwater was demonstrated, whereas the opposite was shown for Ag. An abundant secretion of mucus in response to toxicants was observed, possibly reducing metal availability for uptake, at least under laboratory conditions. This mechanism was particularly active in specimens from Restronguet Creek exposed to Ag and Cu. Unexpectedly, of the two worm populations, Blackwater worms contained significantly higher concentrations of cytosolic heat-stable compounds (CHSTC), a category of cytosolic components that includes metallothioneins, the detoxificatory role of which is well documented, and other compounds binding trace metals via sulphur bonds. However, the concentration of such compounds is not totally representative in itself of their involvement in metal detoxification, because a high rate of their turnover in metal-exposed worms might be responsible for (at least) the Cu storage associated with S in lysosomes as a consequence of the breakdown of Cu-thionein. Cu-containing lysosomes were abundant in epidermal cells of Restronguet Creek worms, but were lacking in Blackwater worms. Extracellular granules present in the epicuticle also contained S and Cu, their number and size being much more important in Restronguet Creek worms, and they appear to be a major detoxificatory store for accumulated Cu. Spherocrystals in cells of the gut wall seem to be the major detoxified store of Zn in Restronguet Creek worms, whereas in specimens from the Blackwater they were also present but contained only S and Ca at detectable levels. Evidence was also found for the presence of detoxificatory intracellular structures containing other metals and metalloids in the tegument and gut epithelium of Restronguet Creek worms.
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Acknowledgements
The authors thank A. Anglo and L. Massot for their technical help in preparing the samples for EPMA and electron microscopy. Studies were carried out at the Centre de microscopie électronique de l'IFR de Biologie Intégrative and the Service inter-universitaire Assistance à la Recherche, Université Pierre et Marie Curie, Paris, France. This work was carried out in the framework of a PICS (International Programme of Scientific Co-operation) project funded by the CNRS (French National Scientific Research Centre). All the experiments presented in this paper complied with the current laws of the United Kingdom, where they were performed.
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Communicated by S.A. Poulet, Roscoff
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Mouneyrac, C., Mastain, O., Amiard, J.C. et al. Trace-metal detoxification and tolerance of the estuarine worm Hediste diversicolor chronically exposed in their environment. Marine Biology 143, 731–744 (2003). https://doi.org/10.1007/s00227-003-1124-6
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DOI: https://doi.org/10.1007/s00227-003-1124-6