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Distribution of Cd and Pb in a wetland ecosystem

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Abstract

Cadmium and lead contents in sediments, dominant species of plants (Phargmites aus-tralis andScripus mariquter), benthos (Helice tridens tientsinensis,Ilyoplax deschampsi, andBul-lacta exarata), and waders (Calidris ruficollis) on the Eastern End of Chongming Island were measured. The results showed that, for cadmium, there are clear stratification in the sediment of reclaimed area and bio-amplification in food chain. However, for lead, a phenomenon was different. The amplification factors (AFs) for cadmium of primary producers, primary consumers, and secondary consumers were 2.59–12.38, 0.09–8.44, and 51.1, respectively. For lead, AFs of primary producers, primary consumers and the top trophic layer were 0.29–2.62, 0.06–5.62, and 7.31, respectively. Each species of macrobenthos showed different strategies to cadmium and lead. Large-sized crabs accumulated more lead, while small-sized crabs and snails accumulated more cadmium. Waders had significantly highest AFs for cadmium and lead in the study. That is to say, bio-amplification of the food chain took place for cadmium and lead on the tidal flat with different AFs, and showed that different species have different strategies to a varies of heavy metal elements.

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Authors and Affiliations

  1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 200062, Shanghai, China

    Wenshan He & Jianjian Lu

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  1. Wenshan He
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  2. Jianjian Lu
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Correspondence to Jianjian Lu.

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He, W., Lu, J. Distribution of Cd and Pb in a wetland ecosystem. Sc. China Ser. B-Chem. 44 (Suppl 1), 178–184 (2001). https://doi.org/10.1007/BF02884825

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  • DOI: https://doi.org/10.1007/BF02884825

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