Toxicity and the fractional distribution of trace metals accumulated from contaminated sediments by the clam Scrobicularia plana exposed in the laboratory and the field.

Kalman, J, Bonnail-Miguel, E, Smith, B.D, Bury, Nic and Rainbow, P.S (2015) Toxicity and the fractional distribution of trace metals accumulated from contaminated sediments by the clam Scrobicularia plana exposed in the laboratory and the field. Science of the Total Environment, 506-07. pp. 109-117. ISSN 0048-9697

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Abstract

The relationship between the subcellular distribution of accumulated toxic metals into five operational fractions (subsequently combined into presumed detoxified and non-detoxified components) and toxicity in the clam Scrobicularia plana was investigated under different laboratory exposures. Clams were exposed to metal contaminated media (water and diet) and analysed for the partitioning of accumulated As, Cu and Zn into subcellular fractions. In general, metallothionein-like proteins, metal-rich granules and cellular debris in different proportions acted as main storage sites of accumulated metals in the clam soft tissues for these three metals. No significant differences were noted in the accumulation rates of As, Cu and Zn of groups of individuals with or without apparent signs of toxicity after up to 30 days of exposure to naturally contaminated sediment mixtures. There was, however, an increased proportional accumulation of Cu in the non-detoxified fraction with increased Cu accumulation rate in the clams, suggesting that the Cu uptake rate from contaminated sediments exceeded the combined rates of elimination and detoxification of Cu, with the subsequent likelihood for toxic effects in the clams.

Item Type: Article
Uncontrolled Keywords: Bioaccumulation, Subcellular partitioning, Toxicity, Arsenic, Copper, Zinc
Subjects: Q Science > Q Science (General)
Q Science > QH Natural history
Divisions: Faculty of Health & Science > Department of Science & Technology
Depositing User: David Upson-Dale
Date Deposited: 28 Feb 2017 10:05
Last Modified: 17 Nov 2017 11:46
URI: http://oars.uos.ac.uk/id/eprint/195

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