Microplastics contamination in pearl-farming lagoons of French Polynesia

Type Article
Date 2021-10
Language English
Author(s) Gardon Tony1, El Rakwe Maria2, Paul-Pont Ika3, Le Luyer Jeremy1, Thomas Lena5, Prado EnoraORCID2, Boukerma Kada2, Cassone Anne-Laure3, Quillien Virgile1, Soyez Claude1, Costes Louis1, Crusot MargauxORCID4, Dreanno Catherine2, Le Moullac Gilles1, Huvet Arnaud3
Affiliation(s) 1 : Ifremer, ILM, IRD, Univ Polynésie française, EIO, F-98719 Taravao, Tahiti, Polynésie française, France
2 : Ifremer, Laboratoire Détection, Capteurs et Mesures (LDCM), Centre Bretagne, ZI de la Pointe du Diable, CS 10070, 29280 Plouzané, France
3 : Univ Brest, Ifremer, CNRS, IRD, LEMAR, F-29280 Plouzané, France
4 : Univ Polynésie française, Ifremer, ILM, IRD, EIO, F-98702 Faa’a, Tahiti, Polynésie française, France
5 : Ifremer, Laboratoire Détection, Capteurs et Mesures (LDCM), Centre Bretagne, ZI de la Pointe du Diable, CS 10070, 29280 Plouzané, France
Source Journal of Hazardous Materials (03043894) (Elsevier BV), 2021-10 , Vol. 419 , P. 126396 (13p.)
DOI 10.1016/j.jhazmat.2021.126396
Keyword(s) Microplastics pollution, Atolls, Surface water, Water column, Pearl oyster
Abstract

Pearl-farming is the second most important source of income in French Polynesia. However, tropical lagoons are fragile ecosystems with regard to anthropogenic pressures like plastic pollution, which threaten marine life and the pearl oyster-related economy. Here, we investigated the spatial distribution of microplastics (MP) and concentrations in surface water (SW), water column (WC) and cultivated pearl oyster (PO) from three pearl-farming atolls with low population and tourism. Microplastics were categorized by their size class, shape, colour and polymer type identified using FTIR spectroscopy. Widespread MP contamination was observed in every study site (SW, 0.2–8.4 MP m–3; WC, 14.0–716.2 MP m–3; PO, 2.1–125.0 MP g–1 dry weight), with high contamination in the WC highlighting the need to study the vertical distribution of MP, especially as this compartment where PO are reared. A large presence of small (< 200 µm) and fragment-shaped (> 70%) MP suggests that they result from the breakdown of larger plastic debris. The most abundant polymer type was polyethylene in SW (34–39%), WC (24–32%), while in PO, polypropylene (14–20%) and polyethylene were more evenly distributed (9–21%). The most common MP identified as black-grey polyethylene and polypropylene matches the polymer and colour of ropes and collectors questioning a pearl-farming origin.

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Gardon Tony, El Rakwe Maria, Paul-Pont Ika, Le Luyer Jeremy, Thomas Lena, Prado Enora, Boukerma Kada, Cassone Anne-Laure, Quillien Virgile, Soyez Claude, Costes Louis, Crusot Margaux, Dreanno Catherine, Le Moullac Gilles, Huvet Arnaud (2021). Microplastics contamination in pearl-farming lagoons of French Polynesia. Journal of Hazardous Materials, 419, 126396 (13p.). Publisher's official version : https://doi.org/10.1016/j.jhazmat.2021.126396 , Open Access version : https://archimer.ifremer.fr/doc/00703/81508/