Mercury in the tissues of five cephalopods species: first data on the nervous system

Type Article
Date 2021-03
Language English
Author(s) Minet Antoine1, Manceau Alain2, Valada-Mennuni Anaïs1, Brault-Favrou Maud1, Churlaud Carine1, Fort Jérôme1, Nguyen Thành1, 3, Spitz Jérôme4, 5, Bustamante Paco1, 6, Lacoue-Labarthe Thomas1
Affiliation(s) 1 : Littoral Environnement et Sociétés (LIENSs), UMR 7266 CNRS - Université de la Rochelle, 2 rue Olympe de Gouges, 17000 La Rochelle, France
2 : Univ. Grenoble Alpes, ISTerre, CNRS, CS 40700, 38058 Grenoble, France
3 : Université des Sciences et des Technologies de Hanoï (USTH), 18 Hoàng Quốc Việt, Nghĩa Đô, Cầu Giấy, Hà Nội, Vietnam
4 : Centre d’Études Biologiques de Chizé (CEBC), UMR 7372 CNRS - Université de la Rochelle, 5 Allée de l’Océan, 17000 La Rochelle, France
5 : Observatoire PELAGIS, UMS 3462 CNRS - Université de la Rochelle, 5 Allée de l’Océan, 17000 La Rochelle, France
6 : Institut Universitaire de France (IUF), 1 rue Descartes 75005, Paris, France
Source Science Of The Total Environment (0048-9697) (Elsevier BV), 2021-03 , Vol. 759 , P. 143907 (9p.)
DOI 10.1016/j.scitotenv.2020.143907
WOS© Times Cited 1
Keyword(s) Organotropism, Mantle muscle, Digestive gland, Optic lobes, MethylHg, Speciation, HR-XANES
Abstract

Mercury (Hg), one of the elements most toxic to biota, accumulates within organisms throughout their lifespans and biomagnifies along trophic chain. Due to their key role in marine systems, cephalopods constitute a major vector of Hg in predators. Further, they grow rapidly and display complex behaviours, which can be altered by neurotoxic Hg. This study investigated Hg concentrations within 80 cephalopod specimens sampled in the Bay of Biscay, which belonged to five species: Eledone cirrhosa, Sepia officinalis, Loligo vulgaris, Todaropsis eblanae and Illex coindetii. Hg concentrations were measured in the digestive gland, the mantle muscle and optic lobes of the brain. The digestive gland and the mantle were tissues with the most concentrated Hg among all species considered (up to 1.50 μg.g-1 dw), except E. cirrhosa. This benthic cephalopod had 1.3-fold higher Hg concentrations in the brain (up to 1.89 μg.g-1 dw) than the mantle, while other species had 2-fold lower concentrations of Hg in the brain than in the mantle. Brain-Hg concentrations can be predicted from muscle-Hg concentrations for a given species, which facilitates the assessment of Hg toxicokinetics in cephalopods. In the most contaminated E. cirrhosa individual, the chemical form of Hg in its digestive gland, mantle muscle, and optic lobes, was determined using High energy-Resolution X-ray Absorption Near Edge Structure (HR XANES) spectroscopy. In the digestive gland, 33 ± 11% of total Hg was inorganic Hg speciated as a dicysteinate complex (Hg(Cys)2), which suggested that the demethylation of dietary MeHg occurs in the organ. All Hg found in the mantle muscle and the optic lobes is methylated and bound to one cysteinyl group (MeHgCys complex), which implies that dietary MeHg is distributed to these tissues via the bloodstream. These results raised the questions regarding interspecific differences observed regarding Hg brain concentrations and the possible effect of Hg on cephalopod functional brain plasticity and behaviour.

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Minet Antoine, Manceau Alain, Valada-Mennuni Anaïs, Brault-Favrou Maud, Churlaud Carine, Fort Jérôme, Nguyen Thành, Spitz Jérôme, Bustamante Paco, Lacoue-Labarthe Thomas (2021). Mercury in the tissues of five cephalopods species: first data on the nervous system. Science Of The Total Environment, 759, 143907 (9p.). Publisher's official version : https://doi.org/10.1016/j.scitotenv.2020.143907 , Open Access version : https://archimer.ifremer.fr/doc/00662/77383/