Main drivers of mercury levels in Southern Ocean lantern fish Myctophidae
Myctophids are the most abundant fish group in the Southern Ocean pelagic ecosystem and are an important link in the Antarctic marine food web. Due to their major ecological role, evaluating the level of mercury (Hg) contamination in myctophids is important as a step towards understanding the trophi...
Published in: | Environmental Pollution |
---|---|
Main Authors: | , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/main-drivers-of-mercury-levels-in-southern-ocean-lantern-fish-myctophidae(d3de90e8-2c25-491c-8523-34221525e878).html https://doi.org/10.1016/j.envpol.2020.114711 https://research-repository.st-andrews.ac.uk/bitstream/10023/23109/1/Seco_2020_Main_drivers_of_mercury_EnvPollut_AAM.pdf |
id |
ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/d3de90e8-2c25-491c-8523-34221525e878 |
---|---|
record_format |
openpolar |
spelling |
ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/d3de90e8-2c25-491c-8523-34221525e878 2023-05-15T13:51:52+02:00 Main drivers of mercury levels in Southern Ocean lantern fish Myctophidae Seco, José Xavier, José C. Bustamante, Paco Coelho, João P. Saunders, Ryan A. Ferreira, Nicole Fielding, Sophie Pardal, Miguel A. Stowasser, Gabriele Viana, Thainara Tarling, Geraint A. Pereira, Eduarda Brierley, Andrew S. 2020-09 application/pdf https://risweb.st-andrews.ac.uk/portal/en/researchoutput/main-drivers-of-mercury-levels-in-southern-ocean-lantern-fish-myctophidae(d3de90e8-2c25-491c-8523-34221525e878).html https://doi.org/10.1016/j.envpol.2020.114711 https://research-repository.st-andrews.ac.uk/bitstream/10023/23109/1/Seco_2020_Main_drivers_of_mercury_EnvPollut_AAM.pdf eng eng info:eu-repo/semantics/openAccess Seco , J , Xavier , J C , Bustamante , P , Coelho , J P , Saunders , R A , Ferreira , N , Fielding , S , Pardal , M A , Stowasser , G , Viana , T , Tarling , G A , Pereira , E & Brierley , A S 2020 , ' Main drivers of mercury levels in Southern Ocean lantern fish Myctophidae ' , Environmental Pollution , vol. 264 , 114711 . https://doi.org/10.1016/j.envpol.2020.114711 Trace element Metal Bioaccumulation Mesopelagic fish Antarctic article 2020 ftunstandrewcris https://doi.org/10.1016/j.envpol.2020.114711 2021-12-26T14:36:35Z Myctophids are the most abundant fish group in the Southern Ocean pelagic ecosystem and are an important link in the Antarctic marine food web. Due to their major ecological role, evaluating the level of mercury (Hg) contamination in myctophids is important as a step towards understanding the trophic pathway of this contaminant. The concentrations of total Hg were determined in muscle, gill, heart and liver tissue of 9 myctophid species to quantify tissue partitioning variability between species. Organic Hg concentration and proportion in muscle was also determined. Hg concentrations were higher in the liver and heart than in muscle and gills, but the proportion of organic Hg was almost 100% in muscle, indicating that the main uptake route for Hg is through the diet. Most of the species analysed have similar vertical and horizontal distributions, and similar feeding modes and prey. Geographical and temporal variability of Hg concentrations was examined using samples from 3 different years (2007/08, 2015/16 and 2016/17) and 2 locations (South Georgia and South Orkneys Islands). Our results appear to indicate a decreasing trend in Hg contamination over the last decade, particularly gill tissue, which is in agreement with a previous study on squid from the same region. There was no significant variability in Hg concentration between the different sampling locations. Hg levels were consistent with values reported previously for myctophids around the world, indicating low global-scale geographic variability. A positive relationship between fish size and Hg concentration was found for most species, with the exception of Electrona antarctica females, which may be explained through Hg elimination by egg laying. We estimate that myctophids collectively comprise a Southern Ocean mercury ‘reserve’ of ≈1.82 metric tonnes. Article in Journal/Newspaper Antarc* Antarctic Antarctica Southern Ocean University of St Andrews: Research Portal Antarctic Southern Ocean The Antarctic Environmental Pollution 264 114711 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Trace element Metal Bioaccumulation Mesopelagic fish Antarctic |
spellingShingle |
Trace element Metal Bioaccumulation Mesopelagic fish Antarctic Seco, José Xavier, José C. Bustamante, Paco Coelho, João P. Saunders, Ryan A. Ferreira, Nicole Fielding, Sophie Pardal, Miguel A. Stowasser, Gabriele Viana, Thainara Tarling, Geraint A. Pereira, Eduarda Brierley, Andrew S. Main drivers of mercury levels in Southern Ocean lantern fish Myctophidae |
topic_facet |
Trace element Metal Bioaccumulation Mesopelagic fish Antarctic |
description |
Myctophids are the most abundant fish group in the Southern Ocean pelagic ecosystem and are an important link in the Antarctic marine food web. Due to their major ecological role, evaluating the level of mercury (Hg) contamination in myctophids is important as a step towards understanding the trophic pathway of this contaminant. The concentrations of total Hg were determined in muscle, gill, heart and liver tissue of 9 myctophid species to quantify tissue partitioning variability between species. Organic Hg concentration and proportion in muscle was also determined. Hg concentrations were higher in the liver and heart than in muscle and gills, but the proportion of organic Hg was almost 100% in muscle, indicating that the main uptake route for Hg is through the diet. Most of the species analysed have similar vertical and horizontal distributions, and similar feeding modes and prey. Geographical and temporal variability of Hg concentrations was examined using samples from 3 different years (2007/08, 2015/16 and 2016/17) and 2 locations (South Georgia and South Orkneys Islands). Our results appear to indicate a decreasing trend in Hg contamination over the last decade, particularly gill tissue, which is in agreement with a previous study on squid from the same region. There was no significant variability in Hg concentration between the different sampling locations. Hg levels were consistent with values reported previously for myctophids around the world, indicating low global-scale geographic variability. A positive relationship between fish size and Hg concentration was found for most species, with the exception of Electrona antarctica females, which may be explained through Hg elimination by egg laying. We estimate that myctophids collectively comprise a Southern Ocean mercury ‘reserve’ of ≈1.82 metric tonnes. |
format |
Article in Journal/Newspaper |
author |
Seco, José Xavier, José C. Bustamante, Paco Coelho, João P. Saunders, Ryan A. Ferreira, Nicole Fielding, Sophie Pardal, Miguel A. Stowasser, Gabriele Viana, Thainara Tarling, Geraint A. Pereira, Eduarda Brierley, Andrew S. |
author_facet |
Seco, José Xavier, José C. Bustamante, Paco Coelho, João P. Saunders, Ryan A. Ferreira, Nicole Fielding, Sophie Pardal, Miguel A. Stowasser, Gabriele Viana, Thainara Tarling, Geraint A. Pereira, Eduarda Brierley, Andrew S. |
author_sort |
Seco, José |
title |
Main drivers of mercury levels in Southern Ocean lantern fish Myctophidae |
title_short |
Main drivers of mercury levels in Southern Ocean lantern fish Myctophidae |
title_full |
Main drivers of mercury levels in Southern Ocean lantern fish Myctophidae |
title_fullStr |
Main drivers of mercury levels in Southern Ocean lantern fish Myctophidae |
title_full_unstemmed |
Main drivers of mercury levels in Southern Ocean lantern fish Myctophidae |
title_sort |
main drivers of mercury levels in southern ocean lantern fish myctophidae |
publishDate |
2020 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/main-drivers-of-mercury-levels-in-southern-ocean-lantern-fish-myctophidae(d3de90e8-2c25-491c-8523-34221525e878).html https://doi.org/10.1016/j.envpol.2020.114711 https://research-repository.st-andrews.ac.uk/bitstream/10023/23109/1/Seco_2020_Main_drivers_of_mercury_EnvPollut_AAM.pdf |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_source |
Seco , J , Xavier , J C , Bustamante , P , Coelho , J P , Saunders , R A , Ferreira , N , Fielding , S , Pardal , M A , Stowasser , G , Viana , T , Tarling , G A , Pereira , E & Brierley , A S 2020 , ' Main drivers of mercury levels in Southern Ocean lantern fish Myctophidae ' , Environmental Pollution , vol. 264 , 114711 . https://doi.org/10.1016/j.envpol.2020.114711 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.envpol.2020.114711 |
container_title |
Environmental Pollution |
container_volume |
264 |
container_start_page |
114711 |
_version_ |
1766255915622727680 |