Abstract
The Bremerhaven Caisson, a benthic mesocosm enclosing a 13 m2 sediment area and 13 m3 trapped water column at high tide, was used for field experiments on the fate of lead and chromium at the isle of Norderney, Southern German Bight. The caisson, made from seawater resistant aluminium, settled on fine sand (mean grain size: 0.2 mm) at an experimental site with about 0.9-m tidal height and 4.5 h of water coverage. During 38 consecutive tides a constant amount of lead was administered to the inflowing water, resulting in a nominal concentration of 0.1 mg l-1 at high tide. A second caisson was taken for chromium using the same procedure. The compartments analysed (water, seston, sediment, and infauna) showed distinct differences for lead and chromium. The particle-reactive element Pb adsorbed by 50–70% onto seston particles, the soluble element Cr-VI by less than 2%. Only a moderate enrichment was measured in the sediment, about 3–4% of the total Pb and Cr added accumulated in the top 3 cm. The fauna attained much higher accumulation factors than the sediment. The lead uptake rates of 15 species and 2 taxa can be placed in order according to the feeding type: filter feeder > deposit feeder (surface) > opportunistic feeder (deposit feeder or predator) > deposit feeder (depth). Chromium was accumulated about 10 times lower than lead, the uptake seems to be more related to the systematic position of the animal (calcareous shell versus chitinous cuticle). In the total mass balance only 0.2% of the lead added and 0.02% of the chromium added were fixed by the fauna.
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Communicated by O. Kinne, Hamburg
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Schulz-Baldes, M., Rehm, E. & Farke, H. Field experiments on the fate of lead and chromium in an intertidal benthic mesocosm, the Bremerhaven Caisson. Mar. Biol. 75, 307–318 (1983). https://doi.org/10.1007/BF00406017
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DOI: https://doi.org/10.1007/BF00406017