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Article Dans Une Revue Science of the Total Environment Année : 2021

Rare earth element organotropism in European eel (Anguilla anguilla)

Résumé

Rare earth elements (REEs) are metallic elements with electronic, magnetic, optical and catalytic propertieswhich make them essential in many industrial and medical fields. REEs are therefore becoming emerging pollutants and it is important to understand their implications for ecosystem health. However, little knowledge of REEbioaccumulation in aquatic organisms is available and especially on their internal distribution in fish. In the present study, REE organotropism was determined in Anguilla anguilla from the Loire estuary (France) by determining burdens in a wide set of tissues, organs and biological fluids. Differences have been observed between lifestages and genders. For yellow eels, the most accumulating organ was the gills (126.90 ± 50.78 μg/kg dw) andfor silver eels, it was the liver (181.78 ± 62.04 μg/kg dw for males; 203.79 ± 111.86 μg/kg dw for females).The comparison between female silver and yellow eels shown that female silver individuals accumulated significantly more REEs in the urinary system (US), muscles, gonads, spleen and liver, while yellow individuals accumulated more in gills. The comparison between male and female silver eels also highlighted differences,indeed the females accumulated significantly more REEs in the US, gonads, skin and spleen, compared tomales which accumulated significantly more in muscles and gills. REEs abundances are also different between organs, life stages and genders. The gonads of female silver eels exhibited a particular profile with the dominance ofgadolinium (Gd) (up to 74.2% of ∑REEs). Moreover, the presence of Anguillicola crassus in the swim bladder oforganisms seemed to have an impact on REE bioaccumulation: parasitized yellow eels present higher concentrations of REEs in muscles, gills, gonads and liver than non-parasitized individuals. Regarding glass eels, REE contribution profiles in the whole body were close to those of yellow and silver eel skin.
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hal-04654530 , version 1 (22-07-2024)

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Marjorie Lortholarie, Laurence Poirier, Abderrahmane Kamari, Christine Herrenknecht, Aurore Zalouk-Vergnoux. Rare earth element organotropism in European eel (Anguilla anguilla). Science of the Total Environment, 2021, 766, pp.142513. ⟨10.1016/j.scitotenv.2020.142513⟩. ⟨hal-04654530⟩
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