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Mercury bioaccumulation and its relationship with trophic biomarkers in a Mediterranean elasmobranch mesopredator

Mercury bioaccumulation and its relationship with trophic biomarkers in a Mediterranean elasmobranch mesopredator
Mercury bioaccumulation and its relationship with trophic biomarkers in a Mediterranean elasmobranch mesopredator

Human activity has led to increased concentrations of mercury (Hg) in the world's oceans. Mercury can bioaccumulate and biomagnify in animal tissues via trophic transfer, thus, becoming most pronounced in larger and older predators. Here, we measured Hg concentrations and their relationship with stable isotopes-based proxies of trophic level (δ 13C and δ 15N values) in multiple tissues of Mustelus spp. from the Mediterranean Sea. We found higher Hg concentrations in muscle than in liver and fin tissues. The relationship between Hg concentrations and δ 15N values in muscle suggested repeated foraging for low trophic level and Hg-poor prey, and biomagnification of Hg at higher trophic levels. Seasonal variations in δ 13C values could indicate shifts in primary production sources and/or in local prey availability. The HBV Se index suggested no risk to human health, however the safe meal limit recommendations are 4.5 and 2.2 portions per month for adults and children, respectively.

Chondrichthyans, Mercury, Mesopredators, Smooth-hound shark, Stable isotopes, Trophic ecology
0025-326X
Díaz-Delgado, Eric
044d241f-8998-433e-8d90-53191d706d09
Girolametti, Federico
b224327c-f0d2-43a0-a701-b58422e58b48
Annibaldi, Anna
4870db0b-f80a-46cb-8c8b-50a282620649
Trueman, Clive N.
d00d3bd6-a47b-4d47-89ae-841c3d506205
Willis, Trevor j.
b53efbe1-9d7c-4ef1-9198-13a0a731c59c
Díaz-Delgado, Eric
044d241f-8998-433e-8d90-53191d706d09
Girolametti, Federico
b224327c-f0d2-43a0-a701-b58422e58b48
Annibaldi, Anna
4870db0b-f80a-46cb-8c8b-50a282620649
Trueman, Clive N.
d00d3bd6-a47b-4d47-89ae-841c3d506205
Willis, Trevor j.
b53efbe1-9d7c-4ef1-9198-13a0a731c59c

Díaz-Delgado, Eric, Girolametti, Federico, Annibaldi, Anna, Trueman, Clive N. and Willis, Trevor j. (2024) Mercury bioaccumulation and its relationship with trophic biomarkers in a Mediterranean elasmobranch mesopredator. Marine Pollution Bulletin, 201, [116218]. (doi:10.1016/j.marpolbul.2024.116218).

Record type: Article

Abstract

Human activity has led to increased concentrations of mercury (Hg) in the world's oceans. Mercury can bioaccumulate and biomagnify in animal tissues via trophic transfer, thus, becoming most pronounced in larger and older predators. Here, we measured Hg concentrations and their relationship with stable isotopes-based proxies of trophic level (δ 13C and δ 15N values) in multiple tissues of Mustelus spp. from the Mediterranean Sea. We found higher Hg concentrations in muscle than in liver and fin tissues. The relationship between Hg concentrations and δ 15N values in muscle suggested repeated foraging for low trophic level and Hg-poor prey, and biomagnification of Hg at higher trophic levels. Seasonal variations in δ 13C values could indicate shifts in primary production sources and/or in local prey availability. The HBV Se index suggested no risk to human health, however the safe meal limit recommendations are 4.5 and 2.2 portions per month for adults and children, respectively.

Text
Revised_MS.EDD.22-02-26[36] - Accepted Manuscript
Restricted to Repository staff only until 25 March 2026.
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pagination_MPB_116218 - Proof
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More information

Accepted/In Press date: 1 March 2024
e-pub ahead of print date: 25 March 2024
Published date: 25 March 2024
Keywords: Chondrichthyans, Mercury, Mesopredators, Smooth-hound shark, Stable isotopes, Trophic ecology

Identifiers

Local EPrints ID: 490288
URI: http://eprints.soton.ac.uk/id/eprint/490288
ISSN: 0025-326X
PURE UUID: ef0f2f53-1739-484c-bda1-89223c4bbf42
ORCID for Clive N. Trueman: ORCID iD orcid.org/0000-0002-4995-736X

Catalogue record

Date deposited: 23 May 2024 16:38
Last modified: 25 May 2024 01:39

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Contributors

Author: Eric Díaz-Delgado
Author: Federico Girolametti
Author: Anna Annibaldi
Author: Trevor j. Willis

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