Mercury concentration trend as a possible result of changes in cod population demography
This is an Accepted Manuscript of an article published by Elsevier in Marine Environmental Research, available online: https://www.elsevier.com/ Mercury (Hg) in Atlantic cod (Gadus morhua) is one of many parameters that are monitored through OSPAR's Joint Assessment and Monitoring Programme. Ti...
Published in: | Marine Environmental Research |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2017
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/2494850 https://doi.org/10.1016/j.marenvres.2017.07.018 |
id |
ftnorskinstvf:oai:niva.brage.unit.no:11250/2494850 |
---|---|
record_format |
openpolar |
spelling |
ftnorskinstvf:oai:niva.brage.unit.no:11250/2494850 2023-05-15T15:27:35+02:00 Mercury concentration trend as a possible result of changes in cod population demography Ruus, Anders Hjermann, Dag Øystein Beylich, Bjørnar Schøyen, Merete Øxnevad, Sigurd Green, Norman Whitaker 2017 application/pdf http://hdl.handle.net/11250/2494850 https://doi.org/10.1016/j.marenvres.2017.07.018 eng eng Elsevier Norges forskningsråd: 234388 Marine Environmental Research. 2017, 130, 85-92. urn:issn:0141-1136 http://hdl.handle.net/11250/2494850 https://doi.org/10.1016/j.marenvres.2017.07.018 cristin:1521994 Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no © 2017 Elsevier Ltd. All rights reserved. CC-BY-NC-ND 85-92 130 Marine Environmental Research Journal article Peer reviewed 2017 ftnorskinstvf https://doi.org/10.1016/j.marenvres.2017.07.018 2023-02-21T08:45:53Z This is an Accepted Manuscript of an article published by Elsevier in Marine Environmental Research, available online: https://www.elsevier.com/ Mercury (Hg) in Atlantic cod (Gadus morhua) is one of many parameters that are monitored through OSPAR's Joint Assessment and Monitoring Programme. Time series for cod in the Inner Oslofjord (Norway) go back to 1984. Until 2014, annual median Hg-concentrations in cod from the Inner Oslofjord showed both significant upward long-term (whole time series) and short-term (recent 10 years) trends (when 2015 was included, the short-term trend was not significant). However, the median length of the cod sampled also showed upward trends. This may have been caused by low cod recruitment in the area since the start of the 2000s, as indicated by beach seine surveys. To investigate how length would impact the trend analysis, the Hg-concentrations in the cod were normalised to 50 cm. No significant short-term trend in Hg-concentrations could be detected for length-normalised concentrations. The results indicated that most of the upward trend in Hg-concentrations could be attributed to the sampling of larger fish. The reasons for the apparent change in the cod population demography are not conclusive, however, sampling bias must also be considered. acceptedVersion Article in Journal/Newspaper atlantic cod Gadus morhua Norwegian Institute for Water research: NIVA Open Access Archive (Brage) Norway Marine Environmental Research 130 85 92 |
institution |
Open Polar |
collection |
Norwegian Institute for Water research: NIVA Open Access Archive (Brage) |
op_collection_id |
ftnorskinstvf |
language |
English |
description |
This is an Accepted Manuscript of an article published by Elsevier in Marine Environmental Research, available online: https://www.elsevier.com/ Mercury (Hg) in Atlantic cod (Gadus morhua) is one of many parameters that are monitored through OSPAR's Joint Assessment and Monitoring Programme. Time series for cod in the Inner Oslofjord (Norway) go back to 1984. Until 2014, annual median Hg-concentrations in cod from the Inner Oslofjord showed both significant upward long-term (whole time series) and short-term (recent 10 years) trends (when 2015 was included, the short-term trend was not significant). However, the median length of the cod sampled also showed upward trends. This may have been caused by low cod recruitment in the area since the start of the 2000s, as indicated by beach seine surveys. To investigate how length would impact the trend analysis, the Hg-concentrations in the cod were normalised to 50 cm. No significant short-term trend in Hg-concentrations could be detected for length-normalised concentrations. The results indicated that most of the upward trend in Hg-concentrations could be attributed to the sampling of larger fish. The reasons for the apparent change in the cod population demography are not conclusive, however, sampling bias must also be considered. acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Ruus, Anders Hjermann, Dag Øystein Beylich, Bjørnar Schøyen, Merete Øxnevad, Sigurd Green, Norman Whitaker |
spellingShingle |
Ruus, Anders Hjermann, Dag Øystein Beylich, Bjørnar Schøyen, Merete Øxnevad, Sigurd Green, Norman Whitaker Mercury concentration trend as a possible result of changes in cod population demography |
author_facet |
Ruus, Anders Hjermann, Dag Øystein Beylich, Bjørnar Schøyen, Merete Øxnevad, Sigurd Green, Norman Whitaker |
author_sort |
Ruus, Anders |
title |
Mercury concentration trend as a possible result of changes in cod population demography |
title_short |
Mercury concentration trend as a possible result of changes in cod population demography |
title_full |
Mercury concentration trend as a possible result of changes in cod population demography |
title_fullStr |
Mercury concentration trend as a possible result of changes in cod population demography |
title_full_unstemmed |
Mercury concentration trend as a possible result of changes in cod population demography |
title_sort |
mercury concentration trend as a possible result of changes in cod population demography |
publisher |
Elsevier |
publishDate |
2017 |
url |
http://hdl.handle.net/11250/2494850 https://doi.org/10.1016/j.marenvres.2017.07.018 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
85-92 130 Marine Environmental Research |
op_relation |
Norges forskningsråd: 234388 Marine Environmental Research. 2017, 130, 85-92. urn:issn:0141-1136 http://hdl.handle.net/11250/2494850 https://doi.org/10.1016/j.marenvres.2017.07.018 cristin:1521994 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no © 2017 Elsevier Ltd. All rights reserved. |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.marenvres.2017.07.018 |
container_title |
Marine Environmental Research |
container_volume |
130 |
container_start_page |
85 |
op_container_end_page |
92 |
_version_ |
1766358009840140288 |