Trace element concentrations in common dolphins (Delphinus delphis) in the Celtic Seas ecoregion: Interelement relationships and effects of life history and health status.

Autor: Gosnell O; Marine and Freshwater Research Centre, Department of Natural Resources & the Environment, School of Science and Computing, Atlantic Technical University, ATU Galway City, Ireland., McHugh B; Marine Institute, Rinville, Oranmore, Co. Galway, Ireland., Minto C; Marine and Freshwater Research Centre, Department of Natural Resources & the Environment, School of Science and Computing, Atlantic Technical University, ATU Galway City, Ireland., McGovern E; Marine Institute, Rinville, Oranmore, Co. Galway, Ireland., Rogan E; Department of Zoology, Ecology and Plant Science, University College, Cork, Ireland., Caurant F; Observatoire Pelagis UAR 3462 La Rochelle Université - CNRS, 5 allées de l'Océan 17000, La Rochelle, France., Pierce GJ; Instituto de Investigaciones Marinas (CSIC), Eduardo Cabello 6 36208, Vigo, Spain., Das K; Freshwater and Oceanic Sciences Unit of Research (FOCUS), Laboratory of Biological Oceanography, University of LIEGE, Allée du 6 Août B6C 4000, Liège, Belgium., O'Donovan J; Department of Agriculture, Food and the Marine, Regional Veterinary Laboratory, Cork, Ireland., Emerit A; Marine and Freshwater Research Centre, Department of Natural Resources & the Environment, School of Science and Computing, Atlantic Technical University, ATU Galway City, Ireland., Murphy S; Marine and Freshwater Research Centre, Department of Natural Resources & the Environment, School of Science and Computing, Atlantic Technical University, ATU Galway City, Ireland. Electronic address: sinead.murphy@atu.ie.
Jazyk: angličtina
Zdroj: Environment international [Environ Int] 2024 Aug; Vol. 190, pp. 108826. Date of Electronic Publication: 2024 Jun 18.
DOI: 10.1016/j.envint.2024.108826
Abstrakt: Given the increased extraction of trace elements for use by new and emerging technologies, monitoring the environmental fate and potential effects of these compounds within the aquatic environment has never been more critical. Here, hepatic trace element concentrations were assessed in a key sentinel predator, the common dolphin (Delphinus delphis), using a long-term dataset. Variation in concentrations were assessed in relation to other elements, time period, decomposition state, sex, age, total body length, sexual maturity and nutritional status, and cause of death. Additionally, mercury toxicity thresholds for evaluating risk were reviewed and employed. Concentrations of elements which bioaccumulate, THg, MeHg, Cd, and Pb, in addition to Se and V, were strongly correlated with age, and/or body length. An association was observed between Zn concentrations and disease status, with significantly higher concentrations measured in individuals that died from infectious disease, compared to other causes. Strong inter-elemental relationships were detected, namely between Hg and Se, MeHg and Se, Cd and Se, and Cu and Zn. While THg:Se molar ratio values were observed to increase with age and body length, approaching equimolarity. THg was largely comprised of inorganic Hg in older individuals, potentially bound to Se, therefore the effects from THg toxicity may possibly be less important than originally assumed. In contrast, higher MeHg:Hg ratio values were reported in juveniles, suggesting a poorer efficiency in demethylation and a higher sensitivity. The generation of data on proportions of hepatic MeHg and inorganic Hg is highly informative to both future toxicity threshold assessments within pollutant indicator assessments, and to understanding the ultimate fate of mercury in the marine web.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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