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

Ana Luisa Maulvault, Ana Custodio, Patricia Anacleto, Tiago Repolho, Pedro Pousao, Maria Leonor Nunes, Mario Diniz, Rui Rosa, Antonio Marques

Research output: Contribution to journalArticle

20 Citations (Scopus)

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 degrees C) and to the expected ocean warming (+4 degrees C, i.e. 22 degrees 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(-1) ww at 22 degrees C against 6.2 mg kg(-1) ww at 18 degrees 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 degrees C to 50.3% at 22 degrees 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. (c) 2016 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)77-85
Number of pages9
JournalEnvironmental Research
Volume149
DOIs
Publication statusPublished - Aug 2016

Keywords

  • Seawater warming
  • European seabass
  • Methylmercury
  • Bioaccumulation
  • Elimination
  • DIETARY METHYLMERCURY
  • INVASIVE CLAMS
  • FISH
  • ACCUMULATION
  • OCEAN
  • KIDNEY
  • LIVER

Cite this

Maulvault, A. L., Custodio, A., Anacleto, P., Repolho, T., Pousao, P., Nunes, M. L., ... Marques, A. (2016). Bioaccumulation and elimination of mercury in juvenile seabass (Dicentrarchus labrax) in a warmer environment. Environmental Research, 149, 77-85. https://doi.org/10.1016/j.envres.2016.04.035
Maulvault, Ana Luisa ; Custodio, Ana ; Anacleto, Patricia ; Repolho, Tiago ; Pousao, Pedro ; Nunes, Maria Leonor ; Diniz, Mario ; Rosa, Rui ; Marques, Antonio. / Bioaccumulation and elimination of mercury in juvenile seabass (Dicentrarchus labrax) in a warmer environment. In: Environmental Research. 2016 ; Vol. 149. pp. 77-85.
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Maulvault, AL, Custodio, A, Anacleto, P, Repolho, T, Pousao, P, Nunes, ML, Diniz, M, Rosa, R & Marques, A 2016, 'Bioaccumulation and elimination of mercury in juvenile seabass (Dicentrarchus labrax) in a warmer environment', Environmental Research, vol. 149, pp. 77-85. https://doi.org/10.1016/j.envres.2016.04.035

Bioaccumulation and elimination of mercury in juvenile seabass (Dicentrarchus labrax) in a warmer environment. / Maulvault, Ana Luisa; Custodio, Ana; Anacleto, Patricia; Repolho, Tiago; Pousao, Pedro; Nunes, Maria Leonor; Diniz, Mario; Rosa, Rui; Marques, Antonio.

In: Environmental Research, Vol. 149, 08.2016, p. 77-85.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Bioaccumulation and elimination of mercury in juvenile seabass (Dicentrarchus labrax) in a warmer environment

AU - Maulvault, Ana Luisa

AU - Custodio, Ana

AU - Anacleto, Patricia

AU - Repolho, Tiago

AU - Pousao, Pedro

AU - Nunes, Maria Leonor

AU - Diniz, Mario

AU - Rosa, Rui

AU - Marques, Antonio

N1 - Sem pdf conforme despacho European Union (311820 ); Portuguese Foundation for Science and Technology (SFRH/BD/103569/2014 ; SFRH/BPD/100728/2014 )

PY - 2016/8

Y1 - 2016/8

N2 - 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 degrees C) and to the expected ocean warming (+4 degrees C, i.e. 22 degrees 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(-1) ww at 22 degrees C against 6.2 mg kg(-1) ww at 18 degrees 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 degrees C to 50.3% at 22 degrees 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. (c) 2016 Elsevier Inc. All rights reserved.

AB - 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 degrees C) and to the expected ocean warming (+4 degrees C, i.e. 22 degrees 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(-1) ww at 22 degrees C against 6.2 mg kg(-1) ww at 18 degrees 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 degrees C to 50.3% at 22 degrees 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. (c) 2016 Elsevier Inc. All rights reserved.

KW - Seawater warming

KW - European seabass

KW - Methylmercury

KW - Bioaccumulation

KW - Elimination

KW - DIETARY METHYLMERCURY

KW - INVASIVE CLAMS

KW - FISH

KW - ACCUMULATION

KW - OCEAN

KW - KIDNEY

KW - LIVER

U2 - 10.1016/j.envres.2016.04.035

DO - 10.1016/j.envres.2016.04.035

M3 - Article

VL - 149

SP - 77

EP - 85

JO - Environmental Research

JF - Environmental Research

SN - 0013-9351

ER -