Cadmium Accumulation by Invertebrates Living at the Sediment–water Interface

Hare, Landis; Tessier, André; Warren, Lesley A.

doi:10.1897/1551-5028(2001)020<0880:cabila>2.0.co;2

Cited by 16 publications

(36 citation statements)

References 16 publications

(28 reference statements)

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“…The relative importance of the water column and sediment compartments as metal sources for a given species is likely to be influenced by the form of its burrow and the composition of the burrow wall as well as by the rate at which the animal irrigates its burrow. Results presented by Hare et al (2001) strengthen the argument that the protection of benthic communities from metal pollution should consider metals in both the water column and sediment compartments. In this regard, the AVS model, which considers only sedimentary metals, was more effective in predicting metal concentrations in pore waters than those in most animal taxa.…”

Section: Sedimentsupporting

confidence: 64%

Incorporation of metal bioavailability into regulatory frameworks—metal exposure in water and sediment

Ahlf¹,

Drost

Heise

2009

J Soils Sediments

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Background, aim, and scope The cause for this position paper is the impression that risk assessors consider primarily the concentration of free metal ions dissolved in solution controlling metal bioavailability in aquatic systems. Aiming at a more realistic risk assessment of metals, bioavailability has to be discussed under the scope of main uptake routes of metals to organisms. Materials and methods On the basis of a review on the literature relating to bioavailability approaches, this work discusses the incorporation of metal bioavailability into the risk assessment of metals in the context of metal exposure.Results The biotic ligand model (BLM) and the concept of sulfide bound metals described by the ratio of simultaneously extracted metals and acid volatile sulfide concept (AVS) have been developed to consider the bioavailability of metals. Both approaches assume that the free ion concentration is the most relevant exposure pathway. However, apart from geochemical conditions, which control free metal concentration, bioavailability is additionally a result of contaminant/particle interaction and of organisms' activity. Asking for the relevant exposure pathways for inorganic metals to organisms, the compartments' water and sediment have been evaluated and also the importance of contaminated food. Discussion We present a conceptual model of the main processes and sources for uptake of trace metals at a biological membrane. On the basis of this model, we have to consider free metal ions, metal complexes, and particle-bound metals. The BLM approach has been proposed for use in European Union risk assessments. However, the BLM provides a means to predict ecotoxicological effect of metals in the environment, but at present assumes that total significant uptake is from the dissolved phase. It is apparent that dietary accumulation of metals is at least as important as metal uptake from the aqueous phase and in many cases dominates metal accumulation.Conclusions We found evidence in literature that uptake occurs via the dissolved phase, metal complexes, dietary, and particle-bound metals. In this regard, the AVS model, which considers only sedimentary metals in anoxic sediments, was more effective in predicting metal concentrations in pore waters than sediment toxicity in general. Recommendations and perspectives Models will be improved by incorporating chronic metal effects rather than the binding to ligands. The most important for a risk assessment is a broad understanding of the relative importance of different uptake routes and the differential toxicity of metals accumulated by organisms with diverse feeding behavior.

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Section: Sedimentsupporting

confidence: 64%

Incorporation of metal bioavailability into regulatory frameworks—metal exposure in water and sediment

Ahlf¹,

Drost

Heise

2009

J Soils Sediments

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“…Results from a field study showed that most of the studied sediment dwelling taxa accumulate their cadmium almost exclusively from the overlying water, but only the burrowing, sediment feeding midge Chironomus staegeri and oligochaete worms of the tubificidae family took up substantial amounts of cadmium through the sediment (30,31). For the freshwater isopod Asellus aquaticus and Asellus racovitzai, the uptake of cadmium from water appeared to be the dominant route (32,33).…”

Section: Sediment Metal Adsorption and Desorptionmentioning

confidence: 97%

Dynamic Model for the Accumulation of Cadmium and Zinc from Water and Sediment by the Aquatic Oligochaete,Tubifex tubifex

Redeker

Bervoets

Blust

2004

Environ. Sci. Technol.

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In aquatic environments, organisms are exposed to and accumulate metals via waterborne and dietary routes including ingested sediment. A key element in understanding metal uptake and accumulation is information concerning the relative importance of the routes of uptake and the kinetics of the processes. In this work the bioaccumulation of the essential element zinc and the nonessential element cadmium were studied from the aqueous and sediment phase, in the cosmopolitan oligochaete Tubifex tubifex, using the radiotracers 109Cd and 65Zn. A compartmental kinetic model was constructed and parametrized by fitting the model to metal body concentrations. Using the pharmacokinetic modeling approach and taking into account the distribution of the metal between water and sediment, the different routes were quantitatively separated. Under the experimental conditions, the sediment phase accounted for 9.8% of the cadmium and 52% of the zinc uptake. These values are based on the uptake of the radiotracers spiked sediments and therefore likely represent maximal values since it was shown that under the specific conditions this was the most mobile metal fraction. This difference was largely explained by the large difference in assimilation efficiency between cadmium and zinc. Simulations of different conditions showed that both dissolved and sediment-associated metal can be important sources of metal exposure for the worms and that the relative importance strongly depends on the metal and exposure conditions including the lability of the metals in the sediment phase.

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“…Thus, metal toxicity depends on the relative contribution of each exposure route, on the metal concentration in each compartment (i.e., overlying water, porewater, and sediment), the toxicity caused by transformations of the sulfide and organic matter bound metal in the gut of sediment-ingesting organisms or via exposure to contaminated food (Meyer et al, 2005). Although the SEM-AVS model has been validated for both acute and chronic toxicity (Di Toro et al, 1990;Casas and Crecelius, 1994;Hare et al, 1994;Pesch et al, 1995), significant evidence has been gained that benthic invertebrates can accumulate metals in large amounts, even when SEM Me − AVS < 0 (Lee et al, 2000a(Lee et al, ,b, 2001Hare et al, 2001;De Jonge et al, 2009.…”

Section: Introductionmentioning

confidence: 99%

Influences of sediment geochemistry on metal accumulation rates and toxicity in the aquatic oligochaete Tubifex tubifex

2014

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Metal bioaccumulation and toxicity in the aquatic oligochaete Tubifex tubifex exposed to three metal-contaminated field-sediments was studied in order to assess whether sediment-geochemistry (AVS, TOC) plays a major role in influencing these parameters, and to assess if the biodynamic concept can be used to explain observed effects in T. tubifex tissue residues and/or toxicity. An active autotomy promotion was observed in three studied sediments at different time points and reproduction impairment could be inferred in T. tubifex exposed to two of the tested sites after 28 days. The present study showed that sediment metal concentration and tissue residues followed significant regression models for four essential metals (Cu, Co, Ni and Zn) and one non-essential metal (Pb). Organic content normalization for As also showed a significant relationship with As tissue residue. Porewater was also revealed to be an important source of metal uptake for essential metals (e.g. Cu, Ni and Zn) and for As, but AVS content was not relevant for metal uptake in T. tubifex in studied sediments. Under the biodynamic concept, it was shown that influx rate from food (IF, sediment ingestion) in T. tubifex, in a range of sediment geochemistry, was able to predict metal bioaccumulation, especially of the essential metals Cu, Ni and Zn, and for the non-essential metal Pb. Additionally, IF appeared to be a better predictor for metal bioaccumulation in T. tubifex compared to sediment geochemistry normalization.

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Cadmium Accumulation by Invertebrates Living at the Sediment–water Interface

Cited by 16 publications

References 16 publications

Incorporation of metal bioavailability into regulatory frameworks—metal exposure in water and sediment

Incorporation of metal bioavailability into regulatory frameworks—metal exposure in water and sediment

Dynamic Model for the Accumulation of Cadmium and Zinc from Water and Sediment by the Aquatic Oligochaete,Tubifex tubifex

Influences of sediment geochemistry on metal accumulation rates and toxicity in the aquatic oligochaete Tubifex tubifex

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