Factors Affecting Trace Metal Uptake and Toxicity to Estuarine Organisms. I. Environmental Parameters

Engel, David W.; Sunda, William G.

doi:10.1016/b978-0-12-718450-0.50011-0

Cited by 78 publications

(52 citation statements)

References 18 publications

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“…In addition, the high k, of Ag may be explained by its speciation in marine waters, which is dominated by a AgC1° neutral charge complex (Turner et al 1981, Byrne et al 1988). This complex is very bioavailable to marine organisms due to its low polarity (Engel et al 1981).…”

Section: Trace Element Uptake From the Dissolved Phasementioning

confidence: 99%

Kinetic determinations of trace element bioaccumulation in the mussel Mytilus edulis

Wang¹,

Fisher²,

Luoma³

1996

Mar. Ecol. Prog. Ser.

403

402

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ABSTRACT. Laboratory experiments employing radiotracer methodology were conducted to determine the assimilation efficiencies from ingested natural seston, the influx rates from the dissolved phase and the efflux rates of 6 trace elements (Ag, Am, Cd, Co. Se and Zn) in the mussel Mytilus edulis. A kinetic model was then employed to predict trace element concentration in mussel tissues in 2 locations for which mussel and environmental data are well described: South San Francisco Bay (California, USA) and Long Island Sound [New York, USA). Assimilation efficiencies from natural seston ranged from 5 to 18": for Ag, 0.6 to 1% for Am, 8 to 20% for Cd, 12 to 16% for CO, 28 to 34% for Se, and 32 to 41 ' :, for Zn. Differences in chlorophyll a concentration in ingested natural seston did not have significant impact on the assimilation of Am, CO, Se and Zn. The influx rate of elements from the dissolved phase increased with the dissolved concentration, conforming to Freundlich adsorption isotherms. The calculated dissolved uptake rate constant was greatest for Ag, followed by Zn > Am -; Cd > CO > Se. The estimated absorption efficiency from the d~ssolved phase was 1.53 % for Ag, 0.34 % for Am, 0.31 X for Cd, 0.11 % for CO, 0.03"' for Se and 0.89% for Zn. Salinity had an inverse effect on the influx rate from the dissolved phase and dissolved organic carbon concentration had no significant effect on trace element uptake. The calculated efflux rate constants for all elements ranged from 1.0 to 3.0% d-' The route of trace element uptake (food vs dissolved) and the duration of exposure to dissolved trace elements (12 h vs 6 d) did not significantly influence trace element efflux rates. A model which used the experimentally determined influx and efflux rates for each of the trace elements, following exposure from ingested food and from water, predicted concentrations of Ag. Cd, Se and Zn in mussels that were directly comparable to actual tissue concentrations independently measured in the 2 reference sites in national monitoring programs. Sensitivity analysis indicated that the total suspended solids load, which can affect mussel feeding activity, assimilation, and trace element concentration in the dissolved and particulate phases, can significantly influence metal bioaccumulation for particlereactive elements such as Ag and Am. For all metals, concentrations in mussels are proportionately related to total metal load in the water column and their assimilation efficiency from ingested particles. Further, the model predicted that over 96% of Se in mussels is obtained from ingested food, under conditions typical of coastal waters. For Ag, Am, Cd, CO and Zn, the relative contribution from the dissolved phase decreases significantly with increasing trace element parhtion coefficients for suspended particles and the assimilation efficiency in mussels of ingested trace elements, values range between 33 and 67% for Ag, 5 and 1 7 % for Am, 47 and 82% for Cd, 4 and 30% for CO, and 17 and 51 ?h for Zn.

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Section: Trace Element Uptake From the Dissolved Phasementioning

confidence: 99%

Kinetic determinations of trace element bioaccumulation in the mussel Mytilus edulis

Wang¹,

Fisher²,

Luoma³

1996

Mar. Ecol. Prog. Ser.

403

402

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“…Many investigations of the bioaccumulation and toxicity of metals to marine organisms have employed a free-ion activity model to describe bioavailability (e.g., Sunda and Lewis 1978;Engel et al 1981;Daly et al 1990;Meador 1991;Campbell 1995). This model relates all observable metal effects to the concentration of free-ionic species and does not consider the concentrations of chelated species (Sunda and Lewis 1978).…”

Section: Acknowledgmentsmentioning

confidence: 99%

Comparative bioaccumulation studies of colloidally complexed and free‐ionic heavy metals in juvenile brown shrimp Penaeus aztecus (Crustacea: Decapoda: Penaeidae)

Carvalho¹,

Benfield

Santschi

1999

Limnology & Oceanography

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A large fraction of the trace metal pool in estuarine and coastal waters is complexed with colloidal-sized macromolecular organic matter. Bioaccumulation and bioavailability studies of trace metals have generally utilized freeionic dissolved metal ions. Consequently, little is known about the uptake and depuration kinetics of the colloidally bound species. Chemical characteristics such as the relative hydrophobicity of these metal-colloid complexes may alter their bioavailability by interfering with or enhancing transport across membrane lipid bilayers. We used radiotracers to compare the bioaccumulation and sites of accumulation of colloidally complexed and free-ionic forms of Ag, Cd, Ba, Fe, Sn, Zn, Co, Hg, and Mn in juvenile brown shrimp Penaeus aztecus. In this paper, we present the results from 14-d uptake and bioaccumulation studies in which shrimp could take up radiotracers only from the water. Our results indicated that the colloidally complexed forms were bioavailable to shrimp. Uptake kinetics appeared to be similar in the two treatments for most metals, although by the end of the uptake study, the wholebody activities of Ba, Sn, and Zn were significantly higher in shrimp exposed to free-ionic metals. While the hepatopancreas appeared to be the site of highest accumulation on a mass-specific basis for both treatments, the total activity level of radiotracer differed between the two treatments. In the colloidally complexed treatment, the majority of total tracer activity was associated with the hepatopancreas while shrimp exposed to free-ionic metals exhibited the highest proportion of total activity in the abdomen. The mechanisms underlying these differences remain to be tested.

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“…However, uptake and accumulation of contaminants vary according to their availability, i.e. their speciation in the aquatic environment and the physiological state of the organism (Bryan, 1979;Engel et al, 1981;Schlekat et al, 2002;Schuwerack, 2002). Trace metal accumulation in the biota can often be highly variable from species to species and with diurnal and seasonal cycles (Bryan, 1979;Engel et al, 1981;Schuwerack, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…their speciation in the aquatic environment and the physiological state of the organism (Bryan, 1979;Engel et al, 1981;Schlekat et al, 2002;Schuwerack, 2002). Trace metal accumulation in the biota can often be highly variable from species to species and with diurnal and seasonal cycles (Bryan, 1979;Engel et al, 1981;Schuwerack, 2002). Metal uptake and accumulation may differ with the nutritional state, age, size and sex of the animal (Leung and Furness, 2000;Schuwerack, 2002), while metal fluctuations in crustaceans exhibit periodisms due to their moult cycle (Bryan, 1979;Engel and Brouwer, 1987;Taylor and Anstiss, 1999).…”

Section: Introductionmentioning

confidence: 99%

The Dart estuary, Devon, UK: a case study of chemical dynamics and pollutant mobility

Schuwerack¹,

Neal²,

Neal³

2007

Hydrol. Earth Syst. Sci.

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Water, sediments and gill and digestive gland tissues of adult common shore crab (Carcinus maenas), collected at Noss Marina, Sandquay (Britannia Royal Naval College), the Dartmouth Pier, Warfleet Cove and Sugary Cove in the Dart estuary, Devon, UK, were analysed for major, minor and trace elements in spring 2004. Total acid-available measurements analysed included the truly dissolved component and acid-available sediments. Trace metal concentrations are associated largely with particulate and micro-particulate/colloidal phases, the latter being able to pass through standard filter papers. Wide ranges of chemical concentrations were found in the water, sediments and tissues at all the locations. In the water column, 48% of the variance is linked to the sea-salt component (Cl, Na, K, Ca, Mg, B, Li and Sr) and the sediment-associated acid-available fractions are linked to Fe-rich lithogenous materials (Ba, Co, Cu, Fe, Mn, V and Zn). In the sediments, trace elements of Cd, Co, Cr, Fe, Pb, Mn, Ni and V are correlated with the sea salts and associated with the fraction of fine sediments within the total sediment. In the gills and the digestive gland tissues of crabs, high concentrations of Al, Cu and Fe are found and there are correlations between acid-available trace metals of Cu, Cr, Fe, Mn, Ni, Sr and Zn. The relationships between trace metal contaminants, their site-specific concentrations, their temporal and spatial variability and the effects of human activities, such as moorland/agriculture with historic mining and recreational activities in the lower Dart estuary, are discussed.

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Factors Affecting Trace Metal Uptake and Toxicity to Estuarine Organisms. I. Environmental Parameters

Cited by 78 publications

References 18 publications

Kinetic determinations of trace element bioaccumulation in the mussel Mytilus edulis

Kinetic determinations of trace element bioaccumulation in the mussel Mytilus edulis

Comparative bioaccumulation studies of colloidally complexed and free‐ionic heavy metals in juvenile brown shrimp Penaeus aztecus (Crustacea: Decapoda: Penaeidae)

The Dart estuary, Devon, UK: a case study of chemical dynamics and pollutant mobility

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