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Title: Bioaccumulation and elimination of mercury in juvenile seabass (Dicentrarchus labrax) in a warmer environment

Abstract

Warming is an expected impact of climate change that will affect coastal areas in the future. These areas are also subjected to strong anthropogenic pressures leading to chemical contamination. Yet, the consequences of both factors for marine ecosystems, biota and consumers are still unknown. The present work aims to investigate, for the first time, the effect of temperature increase on bioaccumulation and elimination of mercury [(total mercury (THg) and methylmercury (MeHg)] in three tissues (muscle, liver, and brain) of a commercially important seafood species – European seabass (Dicentrarchus labrax). Fish were exposed to the ambient temperature currently used in seabass rearing (18 °C) and to the expected ocean warming (+4 °C, i.e. 22 °C), as well as dietary MeHg during 28 days, followed by a depuration period of 28 days fed with a control diet. In both temperature exposures, higher MeHg contents were observed in the brain, followed by the muscle and liver. Liver registered the highest elimination percentages (EF; up to 64% in the liver, 20% in the brain, and 3% in the muscle). Overall, the results clearly indicate that a warming environment promotes MeHg bioaccumulation in all tissues (e.g. highest levels in brain: 8.1 mg kg{sup −1} wwmore » at 22 °C against 6.2 mg kg{sup −1} ww at 18 °C after 28 days of MeHg exposure) and hampers MeHg elimination (e.g. liver EF decreases after 28 days of depuration: from 64.2% at 18 °C to 50.3% at 22 °C). These findings suggest that seafood safety may be compromised in a warming context, particularly for seafood species with contaminant concentrations close to the current regulatory levels. Hence, results point out the need to strengthen research in this area and to revise and/or adapt the current recommendations regarding human exposure to chemical contaminants through seafood consumption, in order to integrate the expected effects of climate change. - Highlights: • Higher MeHg contents were found in the brain, followed by the muscle and liver. • A warmer environment enhances MeHg bioaccumulation and hampers MeHg elimination. • Ocean warming may compromise seafood safety. • Research combining climate change and pollution effects should be strengthened.« less

Authors:
 [1];  [1];
  1. Division of Aquaculture and Seafood Upgrading, Portuguese Institute for the Sea and Atmosphere, I.P. (IPMA), Avenida de Brasília, 1449-006 Lisboa (Portugal)
Publication Date:
OSTI Identifier:
22687758
Resource Type:
Journal Article
Journal Name:
Environmental Research
Additional Journal Information:
Journal Volume: 149; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0013-9351
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ANIMAL TISSUES; AQUATIC ECOSYSTEMS; BIOLOGICAL ACCUMULATION; BRAIN; CLIMATIC CHANGE; LIVER; MERCURY; METHYLMERCURY; SEAFOOD

Citation Formats

Maulvault, Ana Luísa, E-mail: aluisa@ipma.pt, Interdisciplinary Centre of Marine and Environmental Research, MARE – Marine and Environmental Sciences Centre, Laboratório Marítimo da Guia, Faculdade de Ciências da Universidade de Lisboa, Av. Nossa Senhora do Cabo, 939, 2750-374 Cascais, Custódio, Ana, Instituto Superior de Agronomia, Anacleto, Patrícia, Interdisciplinary Centre of Marine and Environmental Research, MARE – Marine and Environmental Sciences Centre, Laboratório Marítimo da Guia, Faculdade de Ciências da Universidade de Lisboa, Av. Nossa Senhora do Cabo, 939, 2750-374 Cascais, and others, and. Bioaccumulation and elimination of mercury in juvenile seabass (Dicentrarchus labrax) in a warmer environment. United States: N. p., 2016. Web. doi:10.1016/J.ENVRES.2016.04.035.
Maulvault, Ana Luísa, E-mail: aluisa@ipma.pt, Interdisciplinary Centre of Marine and Environmental Research, MARE – Marine and Environmental Sciences Centre, Laboratório Marítimo da Guia, Faculdade de Ciências da Universidade de Lisboa, Av. Nossa Senhora do Cabo, 939, 2750-374 Cascais, Custódio, Ana, Instituto Superior de Agronomia, Anacleto, Patrícia, Interdisciplinary Centre of Marine and Environmental Research, MARE – Marine and Environmental Sciences Centre, Laboratório Marítimo da Guia, Faculdade de Ciências da Universidade de Lisboa, Av. Nossa Senhora do Cabo, 939, 2750-374 Cascais, & others, and. Bioaccumulation and elimination of mercury in juvenile seabass (Dicentrarchus labrax) in a warmer environment. United States. https://doi.org/10.1016/J.ENVRES.2016.04.035
Maulvault, Ana Luísa, E-mail: aluisa@ipma.pt, Interdisciplinary Centre of Marine and Environmental Research, MARE – Marine and Environmental Sciences Centre, Laboratório Marítimo da Guia, Faculdade de Ciências da Universidade de Lisboa, Av. Nossa Senhora do Cabo, 939, 2750-374 Cascais, Custódio, Ana, Instituto Superior de Agronomia, Anacleto, Patrícia, Interdisciplinary Centre of Marine and Environmental Research, MARE – Marine and Environmental Sciences Centre, Laboratório Marítimo da Guia, Faculdade de Ciências da Universidade de Lisboa, Av. Nossa Senhora do Cabo, 939, 2750-374 Cascais, and others, and. Mon . "Bioaccumulation and elimination of mercury in juvenile seabass (Dicentrarchus labrax) in a warmer environment". United States. https://doi.org/10.1016/J.ENVRES.2016.04.035.
@article{osti_22687758,
title = {Bioaccumulation and elimination of mercury in juvenile seabass (Dicentrarchus labrax) in a warmer environment},
author = {Maulvault, Ana Luísa, E-mail: aluisa@ipma.pt and Interdisciplinary Centre of Marine and Environmental Research and MARE – Marine and Environmental Sciences Centre, Laboratório Marítimo da Guia, Faculdade de Ciências da Universidade de Lisboa, Av. Nossa Senhora do Cabo, 939, 2750-374 Cascais and Custódio, Ana and Instituto Superior de Agronomia and Anacleto, Patrícia and Interdisciplinary Centre of Marine and Environmental Research and MARE – Marine and Environmental Sciences Centre, Laboratório Marítimo da Guia, Faculdade de Ciências da Universidade de Lisboa, Av. Nossa Senhora do Cabo, 939, 2750-374 Cascais and others, and},
abstractNote = {Warming is an expected impact of climate change that will affect coastal areas in the future. These areas are also subjected to strong anthropogenic pressures leading to chemical contamination. Yet, the consequences of both factors for marine ecosystems, biota and consumers are still unknown. The present work aims to investigate, for the first time, the effect of temperature increase on bioaccumulation and elimination of mercury [(total mercury (THg) and methylmercury (MeHg)] in three tissues (muscle, liver, and brain) of a commercially important seafood species – European seabass (Dicentrarchus labrax). Fish were exposed to the ambient temperature currently used in seabass rearing (18 °C) and to the expected ocean warming (+4 °C, i.e. 22 °C), as well as dietary MeHg during 28 days, followed by a depuration period of 28 days fed with a control diet. In both temperature exposures, higher MeHg contents were observed in the brain, followed by the muscle and liver. Liver registered the highest elimination percentages (EF; up to 64% in the liver, 20% in the brain, and 3% in the muscle). Overall, the results clearly indicate that a warming environment promotes MeHg bioaccumulation in all tissues (e.g. highest levels in brain: 8.1 mg kg{sup −1} ww at 22 °C against 6.2 mg kg{sup −1} ww at 18 °C after 28 days of MeHg exposure) and hampers MeHg elimination (e.g. liver EF decreases after 28 days of depuration: from 64.2% at 18 °C to 50.3% at 22 °C). These findings suggest that seafood safety may be compromised in a warming context, particularly for seafood species with contaminant concentrations close to the current regulatory levels. Hence, results point out the need to strengthen research in this area and to revise and/or adapt the current recommendations regarding human exposure to chemical contaminants through seafood consumption, in order to integrate the expected effects of climate change. - Highlights: • Higher MeHg contents were found in the brain, followed by the muscle and liver. • A warmer environment enhances MeHg bioaccumulation and hampers MeHg elimination. • Ocean warming may compromise seafood safety. • Research combining climate change and pollution effects should be strengthened.},
doi = {10.1016/J.ENVRES.2016.04.035},
url = {https://www.osti.gov/biblio/22687758}, journal = {Environmental Research},
issn = {0013-9351},
number = ,
volume = 149,
place = {United States},
year = {2016},
month = {8}
}