Dynamics of mercury stable isotope compounds in Arctic seals: new insights from a controlled feeding trial on hooded seals Cystophora cristata.

Pinzone, Marianna; Amouroux, David; Tessier, Emmanuel; Acquarone, Mario; Siebert, Ursula; Das, Krishna

doi:10.1016/j.envpol.2024.124450

Article (Scientific journals)

Dynamics of mercury stable isotope compounds in Arctic seals: new insights from a controlled feeding trial on hooded seals Cystophora cristata.

Pinzone, Marianna; Amouroux, David; Tessier, Emmanuel et al.

2024 • In Environmental Pollution, p. 124450

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/320222

DOI
10.1016/j.envpol.2024.124450

PubMed
38944182

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Keywords :

Arctic seals; Hg stable isotopes; bioaccumulation; demethylation; tissue metabolism

Abstract :

[en] Accurate interpretation of mercury (Hg) isotopic data requires the consideration of several biotic factors such as age, diet, geographical range, and tissue metabolic turnover. A priori knowledge of prey-predator isotopic incorporation rates and Hg biomagnification is essential. This study aims to assess Hg stable isotopes incorporation in an Arctic species of Phocidae, the hooded seal Cystophora cristata, kept in human care for 24 months (2012 - 2014) and fed on a constant diet of Norwegian Spring Spawning herring Clupea harengus. We measured THg, MMHg and iHg levels, as well as Hg stable isotope composition with both mass dependent (MDF) and mass independent (MIF) fractionation (e.g. δ202Hg and Δ199,200,201,204Hg) in hooded seal kidney, liver, hair and muscle, in addition to herring muscle. We then calculated Hg MDF and MIF isotopic fractionation between hooded seals and their prey. We found a significant shift in δ202Hg between hooded seal hair (+0.80‰) and kidney (-0.78‰), and herring muscle. In hooded seals tissues δ202Hg correlated positively with MMHg percentage. These findings suggest that tissue-specific Hg speciation is the major driver of changes in Hg isotopic fractionation rates in this Arctic predator. Δ199Hg, Δ200Hg, Δ201Hg and Δ204Hg values did not vary between herring and hooded seal tissues, confirming their utility as tracers of Hg marine and atmospheric sources in top predators. To our knowledge, this represents the first attempt to assess complex Hg isotope dynamics in the internal system of Arctic Phocidae, controlling the effects of age, diet, and distribution. Our results confirm the validity of Hg stable isotopes as tracers of environmental Hg sources even in top predators, but emphasize the importance of animal age and tissue selection for inter-study and inter-species comparisons.

Research Center/Unit :

FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège [BE]

Disciplines :

Aquatic sciences & oceanology
Environmental sciences & ecology

Author, co-author :

Pinzone, Marianna ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique

Amouroux, David ; Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les Matériaux, Pau, France

Tessier, Emmanuel ; Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les Matériaux, Pau, France

Acquarone, Mario ; Arctic Monitoring and Assessment Programme, The Fram Centre, Tromsø, Norway

Siebert, Ursula; Institute for Terrestrial and Aquatic Wildlife Research (ITAW), University of Veterinary Medicine Hannover, Foundation, Büsum, Germany

Das, Krishna ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique

Language :

English

Title :

Dynamics of mercury stable isotope compounds in Arctic seals: new insights from a controlled feeding trial on hooded seals Cystophora cristata.

Publication date :

27 June 2024

Journal title :

Environmental Pollution

ISSN :

0269-7491

eISSN :

1873-6424

Publisher :

Elsevier BV, England

Pages :

124450

Peer reviewed :

Peer Reviewed verified by ORBi

Development Goals :

14. Life below water

Additional URL :

https://api.elsevier.com/content/article/PII:S0269749124011643?httpAccept=text/xml

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]

Funding number :

IsoArctic project, J.0030.19

Available on ORBi :

since 01 July 2024

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