Kinetics of trace metal accumulation and excretion in the polychaete <Emphasis Type="Italic">Nereis diversicolor</Emphasis> |
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Authors: | Email author" target="_blank">A?GeffardEmail author B?D?Smith C?Amiard-Triquet A?Y?Jeantet P?S?Rainbow |
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Institution: | (1) CNRS/GDR 1117, Service d’Ecotoxicologie, ISOMER, SMAB, 2, rue de la Houssinière, BP 92208, 44322 Nantes Cédex 3, France;(2) Deptartment of Zoology, The Natural History Museum, Cromwell Rd, London, SW7 5BD, UK;(3) Equipe de Cytophysiologie analytique, Université Pierre et Marie Curie, 12 rue Cuvier, 75005 Paris, France;(4) Faculté des Sciences, URVVC, EA 2069 Laboratoire d’Eco-Toxicologie, Université de Reims Champagne-Ardenne, Moulin de la Housse, BP 1039, 51687 Reims Cedex 2, France |
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Abstract: | The comparative kinetics of the accumulation of the trace metals copper, zinc and cadmium have been measured in the estuarine
burrowing polychaete worm Nereis (Hediste) diversicolor from two sites: (a) a metal-rich site, Restronguet Creek, Cornwall, UK, which hosts a copper- and zinc-tolerant population
of worms, and (b) the Blackwater estuary, Essex, UK as a control site. A sediment transfer experiment showed that the Blackwater
worms responded to the increased copper bioavailability in Restronguet Creek sediment by accumulating significantly increasing
copper concentrations over 50 days. The Restronguet Creek worms showed no significant change in copper concentration over
50 days in sediment from either site or in sand. Nevertheless, electron microscopy showed that some Restronguet Creek worms
do appear to excrete accumulated copper, probably in association with renewal of the cuticle over a long time scale. The Blackwater
worms did not accumulate extra zinc from the zinc-rich Restronguet Creek sediment, in probable reflection of the regulation
of body zinc concentration by N. diversicolor. Radiolabelled zinc and cadmium were accumulated from labelled sediment and labelled solution by worms from both sites. The
rate of uptake of labelled zinc from sediment was significantly greater in the Restronguet Creek worms, as was the rate of
uptake of labelled cadmium from 10 μg l−1 dissolved exposure; other rates of uptake did not differ between populations. Mucus, which is secreted by Restronguet Creek
worms in response to enhanced copper exposure, adsorbed very small proportions of zinc and cadmium present in solution, indicating
that the mucus does not act as an adsorption barrier against excessive metal uptake by these worms. |
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