K. Hylland et al., INTERACTIONS BETWEEN EUTROPHICATION AND CONTAMINANTS .4. EFFECTS ON SEDIMENT-DWELLING ORGANISMS, Marine pollution bulletin, 33(1-6), 1996, pp. 90-99
Effects of organic enrichment, oxygen availability and the presence of
contaminants on three sediment-dwelling invertebrates, the polychaete
Nereis (Hediste) diversicolor, the bivalve Abra alba and the brittle
star Amphiura filiformis, were assessed using growth, arm regeneration
and biomarkers (metallothionein-like proteins, glutathione reductase,
glutathione S-transferase) in 93-day microcosm experiment. Moderate o
rganic enrichment (approx, 40 g C m(-2)) increased growth and hypoxia
(2.4-3.5 mg l(-1)) decreased growth in all three species. Effects of o
rganic enrichment and low oxygen availability were additive for growth
in N. diversicolor and A. filiformis, whereas there was an interactio
n between hypoxia and organic enrichment in their effects on growth in
A. alba, reflecting a decreased ability of this species to utilize th
e available organic material under hypoxic conditions. Sediment-bound
contaminants (4.8 mg kg(-1) Cd and 1.32 mg kg(-1) benzo[a]pyrene) had
minor effects on growth and arm regeneration. Some biomarkers in N. di
versicolor and A. filiformis reflected tissue contaminant concentratio
ns, whereas there was no response of biomarkers in A. alba to any trea
tment or contaminant. (C) 1997 Elsevier Science Ltd.