Article (Scientific journals)
Factors affecting mercury concentrations in two oceanic cephalopods of commercial interest from the southern Caribbean
Barcia, Laura Garcia; Pinzone, Marianna; Lepoint, Gilles et al.
2021In Marine Pollution Bulletin, 168, p. 112408
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Keywords :
Ecotoxicology; Neon-flying squid; Diamondback squid; stable isotopes; trace elements; mercury; sulfur
Abstract :
[en] Mercury (Hg) concentrations have significantly increased in oceans during the last century. This element accumulates in marine fauna and can reach toxic levels. Seafood consumption is the main pathway of methylmercury (MeHg) toxicity in humans. Here, we analyzed total Hg (T-Hg) concentrations in two oceanic squid species (Ommastrephes bartramii and Thysanoteuthis rhombus) of an increasing commercial interest off Martinique, French West Indies. Stable isotope ratios reveal a negative linear relationship between δ15N or δ13C in diamondback squid samples. No significant trend was observed between δ34S values and T-Hg concentrations, contrasting with the sulfate availability and sulfide abundance hypotheses. This adds to a growing body of evidence suggesting Hg methylation via sulfate-reducing bacteria is not the main mechanism driving Hg bioavailability in mesopelagic organisms. All squid samples present T-Hg levels below the maximum safe consumption limit (0.5 ppm), deeming the establishment of a commercial squid fishery in the region safe for human consumption.
Research center :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Environmental sciences & ecology
Aquatic sciences & oceanology
Author, co-author :
Barcia, Laura Garcia
Pinzone, Marianna  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Lepoint, Gilles  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Pau, Cédric
Das, Krishna  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Kiszka, Jeremy
Language :
English
Title :
Factors affecting mercury concentrations in two oceanic cephalopods of commercial interest from the southern Caribbean
Publication date :
July 2021
Journal title :
Marine Pollution Bulletin
ISSN :
0025-326X
Publisher :
Elsevier, United Kingdom
Volume :
168
Pages :
112408
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 14 June 2021

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