Re-thinking the “ecological envelope” of Eastern Baltic cod ( Gadus morhua ): conditions for productivity, reproduction, and feeding over time
Abstract Hypoxia is presently seen as the principal driver behind the decline of the former dominating Eastern Baltic cod stock (EBC; Gadus morhua). It has been proposed that both worsening conditions for reproduction and lower individual growth, condition, and survival are linked to hypoxia. Here,...
Published in: | ICES Journal of Marine Science |
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Language: | English |
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Oxford University Press (OUP)
2022
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsac017 https://academic.oup.com/icesjms/article-pdf/79/3/689/46880044/fsac017.pdf |
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croxfordunivpr:10.1093/icesjms/fsac017 2024-05-12T08:03:52+00:00 Re-thinking the “ecological envelope” of Eastern Baltic cod ( Gadus morhua ): conditions for productivity, reproduction, and feeding over time Svedäng, Henrik Savchuk, Oleg Villnäs, Anna Norkko, Alf Gustafsson, Bo G Wikström, Sofia A Humborg, Christoph Kuparinen, Anna Stockholm University Baltic Sea Centre Swedish Agency for Marine and Water Management Swedish Environmental Protection Agency Stockholm University Baltic Sea Centre Sophie von Julin Foundation Academy of Finland 2022 http://dx.doi.org/10.1093/icesjms/fsac017 https://academic.oup.com/icesjms/article-pdf/79/3/689/46880044/fsac017.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ ICES Journal of Marine Science volume 79, issue 3, page 689-708 ISSN 1054-3139 1095-9289 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2022 croxfordunivpr https://doi.org/10.1093/icesjms/fsac017 2024-04-18T08:17:46Z Abstract Hypoxia is presently seen as the principal driver behind the decline of the former dominating Eastern Baltic cod stock (EBC; Gadus morhua). It has been proposed that both worsening conditions for reproduction and lower individual growth, condition, and survival are linked to hypoxia. Here, we elucidate the ecological envelope of EBC in terms of salinity stratification, oxygen content, and benthic animal biomasses, and how it has affected EBC productivity over time. The spawning conditions started deteriorating in the Gotland Deep in the 1950s due to oxygen depletion. In contrast, in the Bornholm Basin, hydrographic conditions have remained unchanged over the last 60 years. Indeed, the current extent of both well-oxygenated areas and the frequency of hypoxia events do not differ substantially from periods with high EBC productivity in the 1970s–1980s. Furthermore, oxygenated and therefore potentially suitable feeding areas are abundant in all parts of the Baltic Sea, and our novel analysis provides no evidence of a reduction in benthic food sources for EBC over the last 30 years. We find that while reproduction failure is intricately linked to hydrographic dynamics, a relationship between the spread of hypoxia and the decline in EBC productivity during the last decades cannot be substantiated. Article in Journal/Newspaper Gadus morhua Oxford University Press ICES Journal of Marine Science |
institution |
Open Polar |
collection |
Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography Svedäng, Henrik Savchuk, Oleg Villnäs, Anna Norkko, Alf Gustafsson, Bo G Wikström, Sofia A Humborg, Christoph Re-thinking the “ecological envelope” of Eastern Baltic cod ( Gadus morhua ): conditions for productivity, reproduction, and feeding over time |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Hypoxia is presently seen as the principal driver behind the decline of the former dominating Eastern Baltic cod stock (EBC; Gadus morhua). It has been proposed that both worsening conditions for reproduction and lower individual growth, condition, and survival are linked to hypoxia. Here, we elucidate the ecological envelope of EBC in terms of salinity stratification, oxygen content, and benthic animal biomasses, and how it has affected EBC productivity over time. The spawning conditions started deteriorating in the Gotland Deep in the 1950s due to oxygen depletion. In contrast, in the Bornholm Basin, hydrographic conditions have remained unchanged over the last 60 years. Indeed, the current extent of both well-oxygenated areas and the frequency of hypoxia events do not differ substantially from periods with high EBC productivity in the 1970s–1980s. Furthermore, oxygenated and therefore potentially suitable feeding areas are abundant in all parts of the Baltic Sea, and our novel analysis provides no evidence of a reduction in benthic food sources for EBC over the last 30 years. We find that while reproduction failure is intricately linked to hydrographic dynamics, a relationship between the spread of hypoxia and the decline in EBC productivity during the last decades cannot be substantiated. |
author2 |
Kuparinen, Anna Stockholm University Baltic Sea Centre Swedish Agency for Marine and Water Management Swedish Environmental Protection Agency Stockholm University Baltic Sea Centre Sophie von Julin Foundation Academy of Finland |
format |
Article in Journal/Newspaper |
author |
Svedäng, Henrik Savchuk, Oleg Villnäs, Anna Norkko, Alf Gustafsson, Bo G Wikström, Sofia A Humborg, Christoph |
author_facet |
Svedäng, Henrik Savchuk, Oleg Villnäs, Anna Norkko, Alf Gustafsson, Bo G Wikström, Sofia A Humborg, Christoph |
author_sort |
Svedäng, Henrik |
title |
Re-thinking the “ecological envelope” of Eastern Baltic cod ( Gadus morhua ): conditions for productivity, reproduction, and feeding over time |
title_short |
Re-thinking the “ecological envelope” of Eastern Baltic cod ( Gadus morhua ): conditions for productivity, reproduction, and feeding over time |
title_full |
Re-thinking the “ecological envelope” of Eastern Baltic cod ( Gadus morhua ): conditions for productivity, reproduction, and feeding over time |
title_fullStr |
Re-thinking the “ecological envelope” of Eastern Baltic cod ( Gadus morhua ): conditions for productivity, reproduction, and feeding over time |
title_full_unstemmed |
Re-thinking the “ecological envelope” of Eastern Baltic cod ( Gadus morhua ): conditions for productivity, reproduction, and feeding over time |
title_sort |
re-thinking the “ecological envelope” of eastern baltic cod ( gadus morhua ): conditions for productivity, reproduction, and feeding over time |
publisher |
Oxford University Press (OUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1093/icesjms/fsac017 https://academic.oup.com/icesjms/article-pdf/79/3/689/46880044/fsac017.pdf |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
ICES Journal of Marine Science volume 79, issue 3, page 689-708 ISSN 1054-3139 1095-9289 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/icesjms/fsac017 |
container_title |
ICES Journal of Marine Science |
_version_ |
1798846002706251776 |