Tracking trace elements into complex coral reef trophic networks.

Autor: Briand MJ; Université de la Nouvelle-Calédonie, Institut ISEA and LABEX 'Corail', BP R4, 98851 Nouméa cedex, New Caledonia; Aix-Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO) UM 110, Campus de Luminy, 13288 Marseille, France. Electronic address: marine.briand@mio.osupytheas.fr., Bustamante P; Littoral Environnement et Sociétés (LIENSs), UMR 7266 CNRS-Université de La Rochelle, 2 rue Olympe de Gouges, 17000 La Rochelle, France., Bonnet X; Centre d'Etudes Biologiques de Chizé, UMR 7372 CNRS-Université de La Rochelle, 405 Route de La Canauderie, 79360 Villiers-en-bois, France., Churlaud C; Littoral Environnement et Sociétés (LIENSs), UMR 7266 CNRS-Université de La Rochelle, 2 rue Olympe de Gouges, 17000 La Rochelle, France., Letourneur Y; Université de la Nouvelle-Calédonie, Institut ISEA and LABEX 'Corail', BP R4, 98851 Nouméa cedex, New Caledonia.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2018 Jan 15; Vol. 612, pp. 1091-1104. Date of Electronic Publication: 2017 Sep 08.
DOI: 10.1016/j.scitotenv.2017.08.257
Abstrakt: The integration, accumulation and transfer of trace elements across the main tropic levels of many food webs are poorly documented. This is notably the case for the complex trophic webs of coral reef ecosystems. Our results show that in the south-west lagoon of New Caledonia both abiotic (i.e. sediments) and biotic (i.e. primary producers, consumers and predators) compartments are contaminated by trace elements. However, our analyses revealed different contamination patterns from the sources of organic matter to the predators. The trophic levels involved in the sedimentary benthic food web (S-BFW, based on the sedimentary organic matter) and to a lesser extent in the reef benthic food web (R-BFW, based on algal turf) were mainly contaminated by trace elements that originate from mining activities like Ni and associated trace elements (Co, Cr, Fe, and Mn). Trace elements linked to agro-industrial (As, Hg, and Zn) and urban (Ag, Cd, Cu, Pb, Se, and V) activities were also integrated into the S-BFW, but preferentially into the R-BFW, and to a lesser extent into the detrital benthic food web (D-BFW, supplied by sea-grass plants). Most of the trace elements were biodiminished with increasing trophic levels along food webs. However, a marked biomagnification was observed for Hg, and suspected for Se and Zn. These results provide important baseline information to better interpret trace element contamination in the different organisms and trophic levels in a highly diversified coral reef lagoon.
(Copyright © 2017 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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