New insights from age determination on toxic element accumulation in striped and bottlenose dolphins from Atlantic and Mediterranean waters

Marine Pollution Bulletin
V LahayeF Caurant

Abstract

This study aimed at comparing toxic element (Hg, Cd) bioaccumulation in relation to age for bottlenose (Tursiops truncatus) and striped dolphins (Stenella coeruleoalba) from Mediterranean and Atlantic waters. Metal concentrations were also measured in selected prey to infer metal exposure through the diet. As expected, Mediterranean prey exhibited the highest Hg levels, probably as a consequence of the Hg enrichment of the Mediterranean Sea. Comparing the predators from each area and taking age into account, Mediterranean bottlenose dolphins displayed higher Hg levels than Atlantic dolphins (p = 0.032), whereas Mediterranean striped dolphins did not (p = 0.691). The consumption of Myctophid fish, which showed the highest Hg levels (105+/-80 ngg(-1) w.wt.) among Atlantic prey, may explain the high Hg levels in the liver of the Atlantic striped dolphins and suggested a preferential offshore feeding behaviour in this area. Concerning Cd, no clear differences were found between geographical areas.

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Citations

Jan 11, 2014·Nutrition Journal·Silvio BuscemiGiovam Battista Rini
Aug 19, 2015·Archives of Environmental Contamination and Toxicology·Angela M K HansenBrenda A Jensen
Aug 2, 2015·The Science of the Total Environment·Natalia García-AlvarezOctavio P Luzardo
Apr 8, 2014·The Science of the Total Environment·Paula Méndez-FernandezFlorence Caurant
Mar 12, 2009·EcoHealth·M Wing GoodaleRobert J Taylor
Sep 2, 2019·Bulletin of Environmental Contamination and Toxicology·E Martínez-LópezA J García-Fernández
Nov 5, 2019·The Science of the Total Environment·Silvia S MonteiroCatarina Eira
Aug 6, 2020·Marine Pollution Bulletin·Meng-Hsien ChenChiee-Young Chen

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