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Publication MIO : Mélanie Ourgaud (MIO), Sandrine Ruitton (MIO), Hugo Bourgogne (MIO) Paco Bustamante, Carine Churlaud, Gaël Guillou, Benoît Lebreton, Mireille L.Harmelin-Vivien (MIO) - Trace elements in a Mediterranean scorpaenid fish : Bioaccumulation processes and spatial variations

Version imprimable de cet article

in Progress in Oceanography
Available online 21 November 2017 - https://doi.org/10.1016/j.pocean.2017.11.008

Dans le cadre des programmes MERMEX/MISTRALS, LabEX DRIIHM-CNRS OHM LitMed, et en partenariat avec la Région PACA, l’Agence de l’eau Rhône Méditerranée Corse et la Ville de Marseille, MELANIE OURGAUD (M I O) et al. ont étudié les phénomènes de bioaccumulation et bioamplification des éléments traces dans les rascasses brunes en baie de Marseille et d’Hyères. L’approche par multitraceurs : concentrations en éléments traces couplées à l’étude trophique (contenus stomacaux et isotopes stables du C et N) a permis (i) d’étudier les variations ontogéniques et spatiales de l’alimentation et du niveau trophique du téléostéen, (ii) de caractériser les teneurs en ETs chez cette espèce largement exploitée localement par la pêche aux petits métiers et (iii) d’appréhender les phénomènes de bioaccumulation et de bioamplification des ETs. Les résultats sont publiés dans le volume spécial MERMEX de Progress In Oceanography.

Abstract

The black scorpionfish Scorpaena porcus, a carnivorous sedentary species, was studied as an indicator of local trace element (TE) contamination of coastal fish species in the northwestern Mediterranean Sea. Fish were collected in seagrass meadows in winter 2012 at four sampling sites : three were located near Marseille, a highly urbanized and industrial area that is subjected to various types of contaminant inputs, and one was located near Hyères, a less urbanized area. Size, sex, age and diet of fish were determined before stable isotope and TE analyses. C and N isotopic compositions and concentrations of nine TEs (As, Ba, Cd, Cu, Cr, T-Hg, Ni, Pb, and Zn) were determined in dorsal white muscle. Most TEs did not bioaccumulate in S. porcus, as no increase in TE concentrations with increasing size, age or trophic level of fish was evident. Total mercury (T-Hg) was the only element to bioaccumulate and biomagnify, displaying strong positive correlations of its concentration with age (r = 0.88, p < 0.01), length (r = 0.84, p < 0.01) and δ15N value (r = 0.68, p < 0.01). Compared with the reference site, higher concentrations of As, Ba, Cd, T-Hg, Pb, and Zn were recorded in fish collected at one or all of the Marseille site. In contrast, no difference was observed for Cr, Cu, and Ni concentrations with site. Spatial differences in TE concentrations in S. porcus were related to differences in isotopic composition and to the primary environmental characteristics and human activities prevailing at each site. Concentrations of Cd, T-Hg and Pb in fish muscle (priority substances for monitoring) were all below the maximum permitted European values.

Graphical abstract

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