Report: “Heavy metals in shells and bristleworms — Norderney (1991-1995)”
Description
The aim of biomonitoring studies is to obtain information about the different bioavailable exposure to the environment via concentrations of substances in organisms. However, an understanding of the accumulation strategy and calibration of corresponding organisms as well as an adequate experimental design of sampling is required. In this thesis, the first results of heavy metals (Pb, Cd, Cu, Zn and Hg) are presented in 8 selected species of soil fauna. Account was taken of crustaceans (Cerastoderma edule), mussels (Mytilus edulis), tell mussel (Macoma baltica) as well as the polychaetes Nephtys Hombergii/N. cirrosa, Arenicola marina, Nereis devisicolor and Scolelepis squamata. The material was partly obtained in permanent stations of the NLÖ Coastal Research Centre in the Watt near Norderney, partly from additional stations on the seaside beach of the island. The suitability of the organisms was tested in oriented experiments on the toxicokinetics of the considered elements. Due to observed net accumulation tendencies, both heartcups (C. edule) and mussels, (M. edulis) at least with restriction, are suitable for biomonitoring. Only Zn has to be considered regulated for the mussels. In the case of polychaetes, the results suggest that N Hombergii/N. cirrosa and, with limitations, A. marina are suitable for biomonitoring with regard to all the elements considered. The comparison with literature data reveals no evidence of increased availability of metals for different study collectives at the two sites in Norderney. Within the concept of biomonitoring, chemical concentration levels in organisms are considered as indicators of the bioavailable fraction of substances in the environment. Knowledge of corresponding accumulation strategies, calibration of BioMonitors and an adequate experimental design are important preconditions for this concept. In this paper we report preliminary results of heavy metals (Pb, Cd, Cu, Zn and Hg) in 8 selected macrobenthic species, including the Common Cockle (Cerastoderma edule), the Common Mussel (Mytilus edulis) and the Baltic Tellin (Macoma baltica) as well as the polychaetes Nephtys Hombergii/N. cirrosa, Arenicola marina, Nereis devisicolor and Scolelepis squamata. Samples were partly taken from long-term stations of NLÖ-Forschungstelle Küste in the Wadden Sea at Norderney, partly from additional stations at the exposed sandy beach of the island. First experiments on the metal toxicokinetics provide some indication on the suitability of the organisms tested for biomonitoring. The Common Cockle, C. edule, as well as the Common Mussel, M. edulis, may be used as biomonitiors, according to observed net accumulation for most elements tested. Only Zn seems to be regulated in mussels. Results for polychaetes indicate that collectives of N. Hombergii/N. cirrosa and A. marina may be used as BioMonitors for all elements tested, at least at first Aproximation In comparision to literature data, metal Availabilities in different collections from both localities of the island of Norderney seem to be not elevated.
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Tags
- miesmuschel-mytilus-edulis-schwermetalle-polychaeta-borstenwürmer-muschel-bivalvia-biomonitoring-nlwkn
- norderney