Biodynamic modelling of the bioaccumulation of trace metals (Ag, As and Zn) by an infaunal estuarine invertebrate, the clam Scrobicularia plana

TY - JOUR

T1 - Biodynamic modelling of the bioaccumulation of trace metals (Ag, As and Zn) by an infaunal estuarine invertebrate, the clam Scrobicularia plana

AU - Kalman, J.

AU - Smith, B. D.

AU - Bury, N. R.

AU - Rainbow, P. S.

PY - 2014/9

Y1 - 2014/9

N2 - Biodynamic modelling was used to investigate the uptake and accumulation of three trace metals (Ag, As, Zn) by the deposit feeding estuarine bivalve mollusc Scrobicularia plana. Radioactive labelling techniques were used to quantify the rates of trace metal uptake (and subsequent elimination) from water and sediment diet. The uptake rate constant from solution (+/- SE) was greatest for Ag (3.954 +/- 0.3751 g(-1) d(-1)) followed by As (0.807 +/- 0.1291 g(-1) d(-1)) and Zn (0.103 +/- 0.0161 g(-1) d(-1)). Assimilation efficiencies from ingested sediment were 40.2 +/- 1.3% (Ag), 31.7 +/- 1.0% (Zn) and 25.3 +/- 0.9% (As). Efflux rate constants after exposure to metals in the solution or sediment fell in the range of 0.014-0.060 d(-1). By incorporating these physiological parameters into biodynamic models, our results showed that dissolved metal is the predominant source of accumulated Ag, As and Zn in S. piano, accounting for 66-99%, 50-97% and 52-98% of total accumulation of Ag, As and Zn, respectively, under different field exposure conditions. In general, model-predicted steady state concentrations of Ag, As and Zn matched well with those observed in clams collected in SW England estuaries. Our findings highlight the potential of biodynamic modelling to predict Ag, As and Zn accumulation in S. plana, taking into account specific dissolved and sediment concentrations of the metals at a particular field site, together with local water and sediment geochemistries.

AB - Biodynamic modelling was used to investigate the uptake and accumulation of three trace metals (Ag, As, Zn) by the deposit feeding estuarine bivalve mollusc Scrobicularia plana. Radioactive labelling techniques were used to quantify the rates of trace metal uptake (and subsequent elimination) from water and sediment diet. The uptake rate constant from solution (+/- SE) was greatest for Ag (3.954 +/- 0.3751 g(-1) d(-1)) followed by As (0.807 +/- 0.1291 g(-1) d(-1)) and Zn (0.103 +/- 0.0161 g(-1) d(-1)). Assimilation efficiencies from ingested sediment were 40.2 +/- 1.3% (Ag), 31.7 +/- 1.0% (Zn) and 25.3 +/- 0.9% (As). Efflux rate constants after exposure to metals in the solution or sediment fell in the range of 0.014-0.060 d(-1). By incorporating these physiological parameters into biodynamic models, our results showed that dissolved metal is the predominant source of accumulated Ag, As and Zn in S. piano, accounting for 66-99%, 50-97% and 52-98% of total accumulation of Ag, As and Zn, respectively, under different field exposure conditions. In general, model-predicted steady state concentrations of Ag, As and Zn matched well with those observed in clams collected in SW England estuaries. Our findings highlight the potential of biodynamic modelling to predict Ag, As and Zn accumulation in S. plana, taking into account specific dissolved and sediment concentrations of the metals at a particular field site, together with local water and sediment geochemistries.

KW - Biodynamic model

KW - Arsenic

KW - Silver

KW - Zinc

KW - Bivalve

KW - POLYCHAETE NEREIS-DIVERSICOLOR

KW - DEPOSIT-FEEDING POLYCHAETE

KW - MUSSEL MYTILUS-EDULIS

KW - CORBICULA-FLUMINEA

KW - ARENICOLA-MARINA

KW - MACOMA-BALTHICA

KW - HEAVY-METALS

KW - ACCUMULATION

KW - FOOD

KW - CD

U2 - 10.1016/j.aquatox.2014.05.011

DO - 10.1016/j.aquatox.2014.05.011

M3 - Article

SN - 0166-445X

VL - 154

SP - 121

EP - 130

JO - AQUATIC TOXICOLOGY

JF - AQUATIC TOXICOLOGY

ER -