Mercury concentrations and stable isotope ratios (δ13C and δ15N) in pelagic nekton assemblages of the south-western Indian Ocean
| Type | Article | ||||||||||||
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| Date | 2022-01 | ||||||||||||
| Language | English | ||||||||||||
| Author(s) | Annasawmy Pavanee1, Point David1, Romanov Evgeny V.2, Bodin Nathalie3, 4 | ||||||||||||
| Affiliation(s) | 1 : Géosciences Environnement Toulouse (GET), UMR 5563 CNRS, IRD, UPS, CNES, Observatoire Midi Pyrénées (OMP), 31400 Toulouse, France 2 : Centre technique de recherche et de valorisation des milieux aquatiques (CITEB), 97420 Le Port, Île de la Réunion, France 3 : Institut de Recherche pour le Développement (IRD), Fishing Port, Victoria, Mahé, Seychelles 4 : Sustainable Ocean Seychelles, Beau Belle, Mahé, Seychelles |
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| Source | Marine Pollution Bulletin (0025-326X) (Elsevier BV), 2022-01 , Vol. 174 , P. 113151 (16p.) | ||||||||||||
| DOI | 10.1016/j.marpolbul.2021.113151 | ||||||||||||
| WOS© Times Cited | 1 | ||||||||||||
| Keyword(s) | Trophic ecology, Mercury, Seamount, Squid, Crustacean, Fish | ||||||||||||
| Abstract | Mercury (Hg) concentrations and stable isotope values (δ13C and δ15N) were investigated in micronekton collected from La Pérouse and MAD-Ridge seamounts, Reunion Island and the southern Mozambique Channel. Organisms occupying epipelagic habitats showed lower Hg concentrations relative to deeper dwelling benthopelagic ones. Increasing Hg concentrations with increasing body size were recorded in the Mozambique Channel and Reunion Island. Positive relationships were observed between Hg levels and δ15N values in pelagic nekton assemblages collected at MAD-Ridge seamount and the southern Mozambique Channel, suggesting biomagnification of Hg. Concentrations of Hg in organisms across the south-western Indian Ocean were within the same range of values. Total Hg concentrations depend on a range of factors linked to habitat range, body size and trophic position of the individuals. To our knowledge, this is the first study investigating the patterns of Hg concentrations in pelagic nekton assemblages from the south-western Indian Ocean. |
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