Institut Méditerranéen d’Océanologie
Accueil du site > Nos résultats > Paru dans les médias > Publication MIO : Natascha Schmidt (MIO) , Delphine Thibault (MIO/MARBEC), (...)

Publication MIO : Natascha Schmidt (MIO) , Delphine Thibault (MIO/MARBEC), François Galgani, Andrea Paluselli (MIO), Richard Sempéré (MIO) - Occurrence of microplastics in surface waters of the Gulf of Lion (NW Mediterranean Sea) in Progress in Oceanography

Version imprimable de cet article

Dans le cadre des programmes MERMEX/MISTRALS, JPI Oceans PLASTOX, et Blue-Polut-agence de l’eau, Natascha Schmidt (doctorante au M I O) et al. ont étudié la concentration des microplastiques et leur distribution de taille dans le Rhône et son embouchure, dans la baie de Marseille et au large de Toulon, afin de (1) mieux comprendre l’ampleur de la présence des microplastiques dans la zone d’étude, (2) d’identifier des sources potentielles et (3) de faire des estimations sur le transport des microplastiques par le Rhône et le Courant Nord Méditerranéen. Les résultats sont publiés dans le volume special MERMEX de Progress In Oceanography.

Abstract

Between 2014 and 2016 a total of 43 microplastic samples were collected at six sampling stations in the eastern section of the Gulf of Lion (located in the northwestern Mediterranean Sea), as well as upstream of the Rhône River. Microplastics were found in every sample with highly variable concentrations and masses. Concentrations ranged from 6 · 103 items km−2 to 1 · 106 items km−2 (with an average of 112 · 103 items km−2), and mass ranged from 0.30 g km−2 to 1018 g km−2 DW (mean 61.92 ± 178.03 g km−2). The samples with the highest and lowest microplastic count originate both from the Bay of Marseille. For the Bay of Marseille, it is estimated that the total microplastic load consist of 519 · 103 –101 · 106 items weighing 0.07–118 kg. Estimations for daily microplastic transport by the Northern Current and the Rhône River, two important hydrologic features of the northwestern Mediterranean Sea, range from 0.18 to 86.46 t and from 0.20 to 21.32 kg, respectively. Particles < 1 mm2 clearly dominated sampling stations in the Northern Current, the Rhône River and its plume (52, 53 and 61%, respectively), suggesting a long exposure time in the environment. Items between 1 mm2 and 5 mm2 in size were the most abundant microplastics in Marseille Bay (55%), which suggests coastal pollution sources or the removal of smaller particles from surface waters e.g. by ballasting owing to the presence of epibionts.

Keywords :
Marine litter
Microplastic
Mediterranean Sea
Gulf of Lion
Marseille Bay

Voir en ligne : https://doi.org/10.1016/j.pocean.20...