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Trace metal uptake and sodium regulation in Gammarus marinus from metal polluted estuaries in England



Trace metal uptake and sodium regulation in Gammarus marinus from metal polluted estuaries in England



Journal of the Marine Biological Association of the United Kingdom, 661: 83-92



Zinc, copper and lead uptake from 1 mg .cntdot. l-1 solutions of metal in sea water by four populations of Marinogammarus marinus (Leach) was followed over a two week period. The populations tested were from three rivers in SW England having a history of trace metal contamination; Gannel, Hayle and Restronguet Creek. The fourth population sampled was from an uncontaminated river in NE England; River Coquet. For all metals, the Restronguet Creek population had the highest initial concentration and the Coquet population, the lowest initial concentration. For zinc, Coquet animals were the only group to show significant uptake over the two week period and also had the highest rate of uptake of the other two metals, resulting in the highest final copper and lead concentration of any group. The effect of 1 mg Pb l-1 and 1 mg Cu l-1 on sodium regulatory ability was tested on teh four populations. Animals were exposed for one week to a range of sea-water concentrations between ca. 25-125% sea water. Hyperionic sodium regulation was normal in Coquet and Gannel populations. Sodium regulation in metal-exposed animals from the River Hayle was erratic at low salinities, although high mortalities rendered these results questionable. Lead exposure in Restronguet animals caused a significant lowering of haemolymph sodium at 25% sea water. Overall, there was no consistent relationship between historical metal exposure in M. marinus and the sensitivity of sodium regulation to trace metals.

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Accession: 018188310

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DOI: 10.1017/s0025315400039667


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