Méthodologie pour prévoir le transfert des métaux lourds dans les chaînes trophiques marines incluant les mollusques filtreurs

Ettajani, H.; Pirastru, L.

doi:10.1051/hydro:1992207

Cited by 4 publications

(2 citation statements)

References 5 publications

(6 reference statements)

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“…Part of the mussel's body burden (especially for Cu) is likely to be derived from suspended particulate matter, which for most filter-feeders is the principal source of food. Indeed, several surveys have demonstrated the importance of suspended solids in transferring certain trace metals from the environment into trophic chains (Amiard, 1988;Kersten and Forstner, 1989;Campbell et al, 1988;Ettajani and Pirastru, 1992). This mechanism could explain the significant correlation between Cu in mussels and suspended matter concentrations, observed both at J. Lasfar and Safi (Table II).…”

Section: Metal Contamination Of Musselsmentioning

confidence: 83%

Phosphate industry discharges and their impact on metal contamination and intertidal macrobenthos: Jorf Lasfar and Safi coastlines (morocco)

Cheggour

Langston

Chafik

et al. 1999

Toxicological & Environmental Chemistry

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At Jorf Lasfar and Safi, on the Moroccan Atlantic coastline, there are chemical industry plants that produce phosphate derivates including phosphoric acid and fertilizers, together with by-products such as sulphuric acid. The liquid effluents of the plants are discharged directly into the sea. In order to evaluate their impact, we have compared the distribution of intertidal macrobenthos in several locations, along gradients subjected to differing degrees of phosphate industry pollution. The results illustrate how biological diversity and species densities decrease abruptly in the vicinity of these industrial effluents, and also how recovery, as measured by the same parameters, proceeds with distance from the discharge points. Mussels Mytilus galloprovincialis were heavily contaminated by Cu and Cd at both study locations and their shells showed four kinds of deformities, notably at the Jorf Lasfar site, where the effluents were more aggressive (high in metals, low pH).

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Section: Metal Contamination Of Musselsmentioning

confidence: 83%

Phosphate industry discharges and their impact on metal contamination and intertidal macrobenthos: Jorf Lasfar and Safi coastlines (morocco)

Cheggour

Langston

Chafik

et al. 1999

Toxicological & Environmental Chemistry

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“…Prc'-tr~'atment 01 the sedhnent Mud has been sampled in a coastal area devoted to oyster culture (Bay of Bourgneuf, France) and the finest particles were selected by using elutriation in order to fulfil the feeding requirements of oysters (Razet et al 1990, Ettajani & Pirastru 1992. This sediment was then submitted to overloads of lead introduced in seawater (70 l~g 1 i as Pb(NO3)2 in nitric solution 0.5 tool [ II.…”

Section: Methodsmentioning

confidence: 99%

Bioavailability and toxicity of sediment-bound lead to a filter-feeder bivalve Crassostrea gigas (Thunberg)

et al. 1995

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Two different approaches were used to study the bioavailability of sediment-bound lead. In vitro techniques simulating the potential metal desorption under conditions prevailing in the digestive tract were assayed on a contaminated sediment. An experimental model of a food chain was designed to determine the retention of lead in the soft tissues of oysters according to the environmental source of the metal (water or sediment). Neither enzymatic action nor leaching at low pH (both aspects of digestion) induce the release of important lead amounts from particles. Therefore, after 3 weeks of exposure, the retention of lead from the trophic source is lower (1%) compared with direct contamination (5%). Lysosomes are the major intracellular structures responsible for lead storage in the gills, digestive tract and digestive gland. The abundance of lysosomes and their lead amount vary according to the gross concentrations in the soft tissues. The cytopathological data are in agreement with the results about lead accumulation: in oysters exposed to sediment-bound lead, impairments are not so marked as in individuals contaminated directly from water but the same organelles are concerned. Mitochondrial impairments may be related to the effect of lead on cellular respiration processes and changes involving the granular endoplasmic reticulum may have an effect on the level of protein synthesis. Cellular extrusions carrying away numerous lysosomes loaded with lead could account for the balancing of lead incorporation between 2 and 3 weeks of exposure.

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Influence of ecological factors on accumulation of metal mixtures

Amiard‐Triquet¹

1998

Metal Metabolism in Aquatic Environments

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A very large number of experimental studies in aquatic ecotoxicology have been devoted to the assessment of metal uptake in different classes of living organisms. Most of them are based on analysis of single toxicants, despite the fact that under field conditions the biota is generally exposed to multicontaminant pollution. In addition to producing a direct response in biota, a toxic metal can also act by interfering with other metal ions or elements. Thus, the concurrent presence of two or more metallic contaminants in the organism often yields metal uptake that deviates from those currently observed for individual metals. If the effect is an enhancement of bioaccumulation, it is said to be synergistic. If the effect is a decrease of metal incorporation, it is said to be antagonistic.Most of the knowledge about metal-metal interactions has been acquired in mammalian species. In such species, the major source of metals is the diet and metal uptake depends on the physicochemical forms of storage of metals in food organisms (Amiard-Triquet et al., 1993;Dallinger, 1993). In these conditions, interactions occur inside the organism and changes may be expected at the level of toxicant uptake, distribution, storage and excretion. Biochemical processes such as competitive affinities for intracellular ligands or co-accumulation as mineral granules are probably predominant. In the case of aquatic organisms, interactions can occur both inside organisms (as in mammals) as well as outside through changes of metal speciation, distribution between soluble and insoluble phases and finally bioavailability. Great differences have been detected in metal body burdens when different species (or even different populations within the same species) were compared (Rainbow, 1993). If the species or populations that accumulate the most are Metal Metabolism in Aquatic Environments. Edited

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Méthodologie pour prévoir le transfert des métaux lourds dans les chaînes trophiques marines incluant les mollusques filtreurs

Cited by 4 publications

References 5 publications

Phosphate industry discharges and their impact on metal contamination and intertidal macrobenthos: Jorf Lasfar and Safi coastlines (morocco)

Phosphate industry discharges and their impact on metal contamination and intertidal macrobenthos: Jorf Lasfar and Safi coastlines (morocco)

Bioavailability and toxicity of sediment-bound lead to a filter-feeder bivalve Crassostrea gigas (Thunberg)

Influence of ecological factors on accumulation of metal mixtures

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