Mercury levels in Southern Ocean squid: Variability over the last decade
The concentrations of total and proportions of organic mercury were measured in tissues of 355 individuals of 8 species of Southern Ocean squid (Alluroteuthis antarcticus, Bathyteuthis abyssicola, Filippovia knipovitchi, Galiteuthis glacialis, Gonatus antarcticus, Kondakovia longimana, Psychroteuthi...
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ftnerc:oai:nora.nerc.ac.uk:525107 2023-05-15T13:41:44+02:00 Mercury levels in Southern Ocean squid: Variability over the last decade Seco, José Xavier, José C. Brierley, Andrew S. Bustamante, Paco Coelho, João P. Gregory, Susan Fielding, Sophie Pardal, Miguel A. Pereira, Bárbara Stowasser, Gabriele Tarling, Geraint Pereira, Eduarda 2020-01 http://nora.nerc.ac.uk/id/eprint/525107/ https://www.sciencedirect.com/science/article/pii/S0045653519320223 unknown Elsevier Seco, José; Xavier, José C. orcid:0000-0002-9621-6660 Brierley, Andrew S.; Bustamante, Paco; Coelho, João P.; Gregory, Susan; Fielding, Sophie orcid:0000-0002-3152-4742 Pardal, Miguel A.; Pereira, Bárbara; Stowasser, Gabriele orcid:0000-0002-0595-0772 Tarling, Geraint orcid:0000-0002-3753-5899 Pereira, Eduarda. 2020 Mercury levels in Southern Ocean squid: Variability over the last decade. Chemosphere, 239, 124785. https://doi.org/10.1016/j.chemosphere.2019.124785 <https://doi.org/10.1016/j.chemosphere.2019.124785> Biology and Microbiology Chemistry Publication - Article PeerReviewed 2020 ftnerc https://doi.org/10.1016/j.chemosphere.2019.124785 2023-02-04T19:49:15Z The concentrations of total and proportions of organic mercury were measured in tissues of 355 individuals of 8 species of Southern Ocean squid (Alluroteuthis antarcticus, Bathyteuthis abyssicola, Filippovia knipovitchi, Galiteuthis glacialis, Gonatus antarcticus, Kondakovia longimana, Psychroteuthis glacialis and Slosarczykovia circumantarctica). Squid were caught around South Georgia (Scotia Sea) during 5 cruises, between the austral summers of 2006/07 to 2016/17 to evaluate temporal changes in bioaccumulation and tissue partitioning. Total mercury concentrations varied between 4 ng g−1 and 804 ng g−1 among all tissues. Net accumulation of mercury in muscle with size was observed in A. antarcticus, B. abyssicola and P. glacialis, but no relationship was found for S. circumantarctica and lower concentrations were observed in larger individuals of G. glacialis. Muscle tissues had the highest mercury concentrations in the majority of species, except for F. knipovitchi for which the digestive gland contained highest concentrations. In terms of the percentage of organic mercury in the tissues, muscle always contained the highest values (67%–97%), followed by the digestive gland (22%–38%). Lowest organic mercury percentages were found consistently in the gills (9%–19%), suggesting only low levels of incorporation through the dissolved pathway and/or a limited redistribution of dietary organic mercury towards this tissue. Overall, results are indicative of a decreasing trend of mercury concentrations in the majority of analysed species over the last decade. As cephalopods are an important Southern Ocean trophic link between primary consumers and top predators, these changes suggest decreasing mercury levels in lower trophic levels and an alleviation of the mercury burden on higher predators that consume squid. Article in Journal/Newspaper Antarc* antarcticus Scotia Sea Southern Ocean Natural Environment Research Council: NERC Open Research Archive Southern Ocean Austral Scotia Sea Chemosphere 239 124785 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Biology and Microbiology Chemistry |
spellingShingle |
Biology and Microbiology Chemistry Seco, José Xavier, José C. Brierley, Andrew S. Bustamante, Paco Coelho, João P. Gregory, Susan Fielding, Sophie Pardal, Miguel A. Pereira, Bárbara Stowasser, Gabriele Tarling, Geraint Pereira, Eduarda Mercury levels in Southern Ocean squid: Variability over the last decade |
topic_facet |
Biology and Microbiology Chemistry |
description |
The concentrations of total and proportions of organic mercury were measured in tissues of 355 individuals of 8 species of Southern Ocean squid (Alluroteuthis antarcticus, Bathyteuthis abyssicola, Filippovia knipovitchi, Galiteuthis glacialis, Gonatus antarcticus, Kondakovia longimana, Psychroteuthis glacialis and Slosarczykovia circumantarctica). Squid were caught around South Georgia (Scotia Sea) during 5 cruises, between the austral summers of 2006/07 to 2016/17 to evaluate temporal changes in bioaccumulation and tissue partitioning. Total mercury concentrations varied between 4 ng g−1 and 804 ng g−1 among all tissues. Net accumulation of mercury in muscle with size was observed in A. antarcticus, B. abyssicola and P. glacialis, but no relationship was found for S. circumantarctica and lower concentrations were observed in larger individuals of G. glacialis. Muscle tissues had the highest mercury concentrations in the majority of species, except for F. knipovitchi for which the digestive gland contained highest concentrations. In terms of the percentage of organic mercury in the tissues, muscle always contained the highest values (67%–97%), followed by the digestive gland (22%–38%). Lowest organic mercury percentages were found consistently in the gills (9%–19%), suggesting only low levels of incorporation through the dissolved pathway and/or a limited redistribution of dietary organic mercury towards this tissue. Overall, results are indicative of a decreasing trend of mercury concentrations in the majority of analysed species over the last decade. As cephalopods are an important Southern Ocean trophic link between primary consumers and top predators, these changes suggest decreasing mercury levels in lower trophic levels and an alleviation of the mercury burden on higher predators that consume squid. |
format |
Article in Journal/Newspaper |
author |
Seco, José Xavier, José C. Brierley, Andrew S. Bustamante, Paco Coelho, João P. Gregory, Susan Fielding, Sophie Pardal, Miguel A. Pereira, Bárbara Stowasser, Gabriele Tarling, Geraint Pereira, Eduarda |
author_facet |
Seco, José Xavier, José C. Brierley, Andrew S. Bustamante, Paco Coelho, João P. Gregory, Susan Fielding, Sophie Pardal, Miguel A. Pereira, Bárbara Stowasser, Gabriele Tarling, Geraint Pereira, Eduarda |
author_sort |
Seco, José |
title |
Mercury levels in Southern Ocean squid: Variability over the last decade |
title_short |
Mercury levels in Southern Ocean squid: Variability over the last decade |
title_full |
Mercury levels in Southern Ocean squid: Variability over the last decade |
title_fullStr |
Mercury levels in Southern Ocean squid: Variability over the last decade |
title_full_unstemmed |
Mercury levels in Southern Ocean squid: Variability over the last decade |
title_sort |
mercury levels in southern ocean squid: variability over the last decade |
publisher |
Elsevier |
publishDate |
2020 |
url |
http://nora.nerc.ac.uk/id/eprint/525107/ https://www.sciencedirect.com/science/article/pii/S0045653519320223 |
geographic |
Southern Ocean Austral Scotia Sea |
geographic_facet |
Southern Ocean Austral Scotia Sea |
genre |
Antarc* antarcticus Scotia Sea Southern Ocean |
genre_facet |
Antarc* antarcticus Scotia Sea Southern Ocean |
op_relation |
Seco, José; Xavier, José C. orcid:0000-0002-9621-6660 Brierley, Andrew S.; Bustamante, Paco; Coelho, João P.; Gregory, Susan; Fielding, Sophie orcid:0000-0002-3152-4742 Pardal, Miguel A.; Pereira, Bárbara; Stowasser, Gabriele orcid:0000-0002-0595-0772 Tarling, Geraint orcid:0000-0002-3753-5899 Pereira, Eduarda. 2020 Mercury levels in Southern Ocean squid: Variability over the last decade. Chemosphere, 239, 124785. https://doi.org/10.1016/j.chemosphere.2019.124785 <https://doi.org/10.1016/j.chemosphere.2019.124785> |
op_doi |
https://doi.org/10.1016/j.chemosphere.2019.124785 |
container_title |
Chemosphere |
container_volume |
239 |
container_start_page |
124785 |
_version_ |
1766155816989097984 |