Etude exp�rimentale du transfert de deux �l�ments traces (Ag, Cu) dans une cha�ne trophique marine: Eau ? Particules (s�diment natural, microalgue) ? Mollusques filtreurs (Crassostrea gigas Thunberg)

Ettajani, H.; Amiard‐Triquet, Claude; Amiard, J. C.

doi:10.1007/bf00479888

Cited by 31 publications

(11 citation statements)

References 17 publications

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“…The importance of dietary uptake as a source of cadmium to filter-feeding bivalves has been demonstrated under laboratory conditions for a number of bivalves, including mussels (e.g., Arifin and Bendell-Young, 2000), oysters and clams (e.g., Ettajani et al, 1992;Reinfelder et al, 1997), supporting our findings here. Roesjadi and Klerks (1989) have reported that the digestive membrane may be tissue components enriched with cadmium due to the presence of cadmium rich metallothioneins.…”

Section: The Importance Of Diet As a Source Of Cadmium To Bc Oysterssupporting

confidence: 82%

Sources of dietary cadmium to the Pacific oyster Crassostrea gigas

Christie¹,

Bendell²

2009

Marine Environmental Research

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Section: The Importance Of Diet As a Source Of Cadmium To Bc Oysterssupporting

confidence: 82%

Sources of dietary cadmium to the Pacific oyster Crassostrea gigas

Christie¹,

Bendell²

2009

Marine Environmental Research

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“…However, this potential bioavailability is only responsible for a low additional As accumulation in the soft tissues of oysters, contrary to previous observations about Cu and Pb transfer from sediment (Ettajani et al 1992;Amiard et al 1995). On the other hand, when As is provided with phytoplanktonic food, incorporation has been observed in marine invertebrates of the Chesapeake Bay and the Baltic Sea but no food-chain biomagnification was apparent (Sanders et al 1989;and unpublished results by Notini and Rosemarin (1986) mentioned in the previous reference).…”

Section: Discussioncontrasting

confidence: 69%

Fate and effects of soluble or sediment-bound arsenic in oysters (Crassostrea gigas thun.)

Ettajani¹,

Amiard‐Triquet²,

Jeantet

et al. 1996

Arch. Environ. Contam. Toxicol.

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Contaminated sediments are a possible source of stress to the benthic biota. In order to examine this way of transfer concurrently with direct exposure, oysters were exposed to As dissolved in natural seawater or loaded to particles. The sediment used as a vector of transfer was a mud from a coastal area devoted to oyster culture, the finest particles of which have been selected. It was submitted to experimental contamination then to in vitro desorption tests, in which enzymes and pH changes were used to mimic the digestive processes in Molluscs. Although different enzymes or pH induced the desorption of 3 to 24% of sediment-bound arsenic, the accumulation of this element in the soft tissues of oysters remained low after exposure to contaminated particles. The uptake of soluble arsenic was also limited although checking the level of arsenic in seawater every day revealed no significant decrease of the contaminant in the experimental medium. However, cytological effects were noted in oysters exposed to sediment-bound arsenic and moreover to soluble arsenic. They consisted of structural alterations of mitochondria and nuclei, suggesting a disturbance of both the cellular respiratory metabolism and nucleotid incorporation.

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“…In oysters fed Cu-enriched diatoms (Haslea ostrearia), it has been shown that the percentage of metal retained by bivalves increased from 13 to 79% and to 93% after 1, 2 and 3 wk of experimental feeding, respectively (Ettajani et al 1992). Temporal changes in Cu retention in oysters may be attributed to differential absorption of biochemical components by these bivalves in response to changes in their food regime, as shown in other species, Mytilus chilensis and Mulinia edulis.…”

Section: Ae (%)mentioning

confidence: 93%

Physico-chemical form of trace metals accumulated by phytoplankton and their assimilation by filter-feeding invertebrates

Ng¹,

Amiard‐Triquet²,

Rainbow³

et al. 2005

Mar. Ecol. Prog. Ser.

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This study investigated whether the nature of the binding of the trace metals cadmium, silver and zinc accumulated by phytoplankton can affect their subsequent assimilation efficiencies (AE) in 3 filter-feeding benthic invertebrates, the green mussel Perna viridis, the clam Ruditapes philippinarum and the barnacle Balanus amphitrite. Seven phytoplankton species were chosen from a wide systematic range to ensure large differences in the partitioning of their accumulated trace metals into 3 fractions: (1) exchangeable metal adsorbed on the outside of the cells, as defined by extraction with the chelating agent 8-hydroxyquinoline-5-sulphonate; (2) incorporated metal that is in a soluble form; and (3) insoluble incorporated metal. There were few significant correlations between AE and the percentage of phytoplankton metal incorporated into any 1 fraction or combination of fractions. There is no support, therefore, for a generalised conclusion that any of the 3 fractions isolated represents the sole form of phytoplankton metal that is bioavailable for trophic transfer to a herbivore. Even trace metals bound to the insoluble fraction in phytoplankton may be bioavailable to herbivores. Furthermore, there were no consistent effects of phytoplankton concentration on metal AEs in 1 of the herbivores -P. viridis. There was no evidence that the AE of any of the 3 trace metals was changed when the herbivores were feeding on the phytoplankton species (Thalassiosira weissflogii) on which they were fed during acclimation. KEY WORDS: Trace metal assimilation · Phytoplankton · Filter-feeding invertebratesResale or republication not permitted without written consent of the publisher

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Etude exp�rimentale du transfert de deux �l�ments traces (Ag, Cu) dans une cha�ne trophique marine: Eau ? Particules (s�diment natural, microalgue) ? Mollusques filtreurs (Crassostrea gigas Thunberg)

Cited by 31 publications

References 17 publications

Sources of dietary cadmium to the Pacific oyster Crassostrea gigas

Sources of dietary cadmium to the Pacific oyster Crassostrea gigas

Fate and effects of soluble or sediment-bound arsenic in oysters (Crassostrea gigas thun.)

Physico-chemical form of trace metals accumulated by phytoplankton and their assimilation by filter-feeding invertebrates

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