Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 751, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.141453
Keywords
Ecotoxicology; Bioaccumulation; Trophic webs; Bio-reduction; Biogeography; Multiple correspondence analyses
Categories
Funding
- ANR ISO2MET [ANR-18-CE34-0002]
- PNEC Programme (Chantier Nouvelle-Caleclonie)
- IRD (Institut de Recherche pour le Developpement)
- IPEV (Institut Paul Emile Victor) [309]
- TAAF (Terres Australes et Antarctiques Francaises)
- CPER (Contrat de Projet Etat-Region)
- FEDER (Fonds Europeen de Developpement Regional)
- IUF (Institut Universitaire de France)
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This study investigated the Li concentrations in marine organisms across different biogeographic areas and found significant variations among tissues, as well as a temperature dependency in the bioaccumulation process.
Trace metals such as Cu, Hg, and Zn have been widely investigated in marine ecotoxicological studies considering their bioaccumulation, transfer along trophic webs, and the risks they pose to ecosystems and human health. Comparatively, Li has received little attention, although this element is increasingly used in the high-tech, ceramics/glass, and medication industries. Here, we report Li concentrations in more than 400 samples, including whole organisms and different organs of bivalves, cephalopods, crustaceans, and fish. We investigated species from three contrasting biogeographic areas, i.e. temperate (Bay of Biscay, northeast Atlantic Ocean), tropical (New Caledonia, Pacific Ocean), and subpolar climates (Kerguelen Islands, southern Indian Ocean), among diverse trophic groups (filter-feeders to meso-predators) and habitats (benthic, demersal, and pelagic). Although Li is homogeneously distributed in the ocean (at 0.18 mu g/mL), Li concentrations in soft tissues vary greatly, from 0.01 to 1.20 mu g/g dry weight. Multiple correspondence analyses reveal two clusters of high and low Li concentrations. Li distributions in marine organisms appear to be mostly geographically independent, though our results highlight a temperature dependency in fish muscles. Li is consistently bio-reduced through the trophic webs, with filter-feeders showing the highest concentrations and predatory fish the lowest. Strong variations are observed among organs, consistent with the biochemical similarity between Na and Li during transport in the brain and in osmoregulatory organs. Fish gills and kidneys show relatively high Li concentrations (0.26 and 0.15 mu g/g, respectively) and fish brains show a large range of Li contents (up to 0.34 mu g/g), whereas fish liver and muscles are Li depleted (0.07 +/- 0.03 and 0.06 +/- 0.08 mu g/g, respectively). Altogether, these results provide the first exhaustive baseline for future Li ecotoxicology studies in marine coastal environments. (C) 2020 Elsevier B.V. All rights reserved.
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