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Mercury bioaccumulation in the long-fin squid Loligo forbesi near the Mid-Atlantic Ridge: Implications to human exposure.

Abstract：

:Due to growing commercial interest as a fishing resource and its intermediate position in the marine trophic chains as both prey and predator, cephalopods can play an important role in mercury (Hg) transfer along the marine food webs, since they can bioaccumulate this metal in its tissues. Our study aims to analyze Hg accumulation in Loligo forbesi caught in the Azores Archipelago (Portugal) quantifying Hg in different tissues (mantle and stomach), as well in the squid stomach content, in order to evaluate the efficiency of Hg transfer from prey to predator. Hg data from the tissues was used to estimate the weekly tolerable Hg intake due to squid consumption. Overall data indicate that Hg measured in the stomach tissue (0.1 ± 0.01 μg g-1) was significantly higher than Hg levels found in the mantle (0.04 ± 0.001 μg g-1) and stomach contents (0.01 ± 0.001 μg g-1). BMF (bioaccumulation factor) was >1 for all the samples, indicating a biomagnification process from prey to predator. Hg concentration in the mantle tissue was correlated with mantle size; although females present higher Hg levels than males, the difference was found to be not related to gender but rather to the fact that females had larger bodies. Finally, considering the Hg concentration found in the mantle and the permitted Hg levels, it is advisable to consume up to 1050-1890g of squid per week, according to the regulatory agencies. Thus, our results indicate that, since these doses are respected, consumption of squids from the Azorean waters do not pose a risk to humans.

journal_name

Ecotoxicol Environ Saf

journal_title

Ecotoxicology and environmental safety

authors

Vieira HC,Rendón-von Osten J,Soares AMVM,Morgado F,Abreu SN

doi

10.1016/j.ecoenv.2020.110957

subject

Has Abstract

pub_date

2020-10-15 00:00:00

pages

110957

eissn

0147-6513

issn

1090-2414

pii

S0147-6513(20)30796-X

journal_volume

203

pub_type

杂志文章

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