Bioaccumulation, organotropism and fate of cadmium in Gammarus fossarum exposed through dietary pathway.

Despite a good knowledge of cadmium accumulation in Gammarus fossarum, studies to date have focused on Cd accumulated via the dissolved pathway, leaving aside the trophic pathway. The aim of this study was to assess cadmium organotropism and bioaccumulation processes following a trophic exposure of the species Gammarus fossarum. Adult male gammarids were fed with Cd contaminated alder leaves discs for 6 days and then with clean alder leaves for 12 days.

Mercury Accumulation and Transfer in Hydrothermal Coastal Environment: The Case of the Geothermal Plant of Bouillante.

Geothermal vents can constitute local significant sources of mercury (Hg) in the environment. The geothermal power plant of Bouillante (Guadeloupe, Lesser Antilles) artificially enhances the release of hydrothermal water in shallow areas of the bay. To assess the impact of this release on the Hg transfer in the environment, Hg concentrations were assessed in sediments, sulphur-oxidising bacteria and six animal species (urchin, sponges and fish) with various diets and trophic levels from the Bouillante Bay and a distant Control Site.

Shark critical life stage vulnerability to monthly temperature variations under climate change.

In a 10-month experimental study, we assessed the combined impact of warming and acidification on critical life stages of small-spotted catshark (Scyliorhinus canicula). Using recently developed frameworks, we disentangled individual and group responses to two climate scenarios projected for 2100 (SSP2-4.5: Middle of the road and SSP5-8.

Variation of 210-polonium in the cephalopod community from the Bay of Biscay, North-East Atlantic.

Among natural radionuclides, Po is the major contributor to the radiation dose received by marine organisms. In cephalopods, Po is concentrated in the digestive gland, which contains over 90% of the whole-body burden of the nuclide. Although previous studies showed that Po was taken up independently of Pb, its parent nuclide, very little is known about the factors influencing its levels in cephalopods.

Mercury (De)Methylation Metabolism in Cephalopods under Different CO Scenarios.

This work quantified the accumulation efficiencies of Hg in cuttlefish, depending on both organic (MeHg) and inorganic (Hg(II)) forms, under increased CO (1600 μatm). Cuttlefish were fed with live shrimps injected with two Hg stable isotopic tracers (MeHg and Hg(II)), which allowed for the simultaneous quantification of internal Hg accumulation, Hg(II) methylation, and MeHg demethylation rates in different organs. Results showed that CO had no impact on Hg bioaccumulation and organotropism, and both Hg and CO did not influence the microbiota diversity of gut and digestive gland.