Metal stable isotopes in transplanted oysters as a new tool for monitoring anthropogenic metal bioaccumulation in marine environments: The case for copper

Type Article
Date 2021-12
Language English
Author(s) Ferreira Araujo Daniel1, Knoery JoelORCID1, Briant NicolasORCID1, Ponzevera Emmanuel2, Chouvelon Tiphaine1, 3, Auby IsabelleORCID4, Yepez Santiago5, Bruzac Sandrine1, Sireau Teddy1, Pellouin-Grouhel AnneORCID6, Akcha Farida7
Affiliation(s) 1 : Ifremer, Unité Biogéochimie et Écotoxicologie, Laboratoire de Biogéochimie des Contaminants Métalliques (BE/LBCM), Rue de L’Ile D’Yeu, BP 21105, 44311, Nantes Cedex 03, France
2 : Ifremer, Unité Biogéochimie et Écotoxicologie (BE), Rue de L’Ile D’Yeu, BP 21105, 44311, Nantes Cedex 03, France
3 : Observatoire Pelagis, UMS 3462 La Rochelle Université-CNRS, 5 Allée de L'Océan, 17000, La Rochelle, France
4 : Ifremer, Unité Littoral, Laboratoire Environnement Ressources D’Arcachon (Littoral/LERAR), Quai Du Commandant Silhouette, 33120, Arcachon, France
5 : Department of Forest Management and Environment, Faculty of Forestry, University of Concepcion, Calle Victoria, 500 Concepción, Bio-Bio, Chile
6 : Ifremer, Unité Biogéochimie et Écotoxicologie (BE), Réseau D'Observation de La Contamination Chimique Du Littoral Rue de L’Ile D’Yeu, BP 21105, 44311, Nantes Cedex 03, France
7 : Ifremer, Unité Biogéochimie et Écotoxicologie, Laboratoire D’Écotoxicologie (BE/LEX), Rue de L’Ile D’Yeu, BP 21105, 44311, Nantes Cedex 03, France
Source Environmental Pollution (0269-7491) (Elsevier BV), 2021-12 , Vol. 290 , P. 118012 (10p.)
DOI 10.1016/j.envpol.2021.118012
WOS© Times Cited 5
Keyword(s) Metal bioaccumulation, Non-traditional isotopes, Bivalve mollusk, Arcachon bay, MC-ICP-MS
Abstract

Metal release into the environment from anthropogenic activities may endanger ecosystems and human health. However, identifying and quantifying anthropogenic metal bioaccumulation in organisms remain a challenging task. In this work, we assess Cu isotopes in Pacific oysters (C. gigas) as a new tool for monitoring anthropogenic Cu bioaccumulation into marine environments. Arcachon Bay was taken as a natural laboratory due to its increasing contamination by Cu, and its relevance as a prominent shellfish production area. Here, we transplanted 18-month old oysters reared in an oceanic neighbor area into two Arcachon Bay mariculture sites under different exposure levels to continental Cu inputs. At the end of their 12-month long transplantation period, the oysters’ Cu body burdens had increased, and was shifted toward more positive δ65Cu values. The gradient of Cu isotope compositions observed for oysters sampling stations was consistent with relative geographic distance and exposure intensities to unknown continental Cu sources. A binary isotope mixing model based on experimental data allowed to estimate the Cu continental fraction bioaccumulated in the transplanted oysters. The positive δ65Cu values and high bioaccumulated levels of Cu in transplanted oysters support that continental emissions are dominantly anthropogenic. However, identifying specific pollutant coastal source remained unelucidated mostly due to their broader and overlapping isotope signatures and potential post-depositional Cu isotope fractionation processes. Further investigations on isotope fractionation of Cu-based compounds in an aqueous medium may improve Cu source discrimination. Thus, using Cu as an example, this work combines for the first time a well-known caged bivalve approach with metal stable isotope techniques for monitoring and quantifying the bioaccumulation of anthropogenic metal into marine environments. Also, it states the main challenges to pinpoint specific coastal anthropogenic sources utilizing this approach and provides the perspectives for further studies to overcome them.

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Ferreira Araujo Daniel, Knoery Joel, Briant Nicolas, Ponzevera Emmanuel, Chouvelon Tiphaine, Auby Isabelle, Yepez Santiago, Bruzac Sandrine, Sireau Teddy, Pellouin-Grouhel Anne, Akcha Farida (2021). Metal stable isotopes in transplanted oysters as a new tool for monitoring anthropogenic metal bioaccumulation in marine environments: The case for copper. Environmental Pollution, 290, 118012 (10p.). Publisher's official version : https://doi.org/10.1016/j.envpol.2021.118012 , Open Access version : https://archimer.ifremer.fr/doc/00718/83006/