Marked recent declines in boron in Baltic Sea cod otoliths – a bellwether of incipient acidification in a vast hypoxic system?
Ocean acidification is spreading globally as a result of anthropogenic CO2 emissions, but the Baltic Sea has until recently been thought to be relatively well-buffered by terrigenous inputs of alkalinity from its watershed. We discovered a 3- to 5-fold decline in boron (as B : Ca) in otoliths of eas...
Published in: | Biogeosciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Publications
2023
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00070177 2023-12-31T10:21:36+01:00 Marked recent declines in boron in Baltic Sea cod otoliths – a bellwether of incipient acidification in a vast hypoxic system? Limburg, Karin E. Heimbrand, Yvette Kuliński, Karol 2023-11 electronic https://doi.org/10.5194/bg-20-4751-2023 https://noa.gwlb.de/receive/cop_mods_00070177 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00068533/bg-20-4751-2023.pdf https://bg.copernicus.org/articles/20/4751/2023/bg-20-4751-2023.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-20-4751-2023 https://noa.gwlb.de/receive/cop_mods_00070177 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00068533/bg-20-4751-2023.pdf https://bg.copernicus.org/articles/20/4751/2023/bg-20-4751-2023.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/bg-20-4751-2023 2023-12-04T00:22:44Z Ocean acidification is spreading globally as a result of anthropogenic CO2 emissions, but the Baltic Sea has until recently been thought to be relatively well-buffered by terrigenous inputs of alkalinity from its watershed. We discovered a 3- to 5-fold decline in boron (as B : Ca) in otoliths of eastern Baltic cod (EBC) between the late 1990s and 2021. Examining a time series of EBC otoliths, we found varying levels of B : Ca starting in the 1980s, with the most recent years showing an all-time low for this period. This trend correlates with declines in pH and dissolved oxygen but not with changes in salinity. We examined possible physiological influences on B : Ca by including a collection of Icelandic cod as an “out-group”. Icelandic cod otoliths showed strongly positive correlations of B : Ca with physiologically regulated P : Ca; this was not the case for EBC. Finally, B : Ca in EBC otoliths is negatively correlated, to some extent, with Mn : Mg, a proposed proxy for hypoxia exposure. This negative relationship is hypothesized to reflect the dual phenomena of hypoxia and acidification as a result of decomposition of large algal blooms. Taken together, the otolith biomarkers Mn : Mg and B : Ca in cod suggest a general increase in both hypoxia and acidification within the Baltic intermediate and deep waters in the last decade. Article in Journal/Newspaper Ocean acidification Niedersächsisches Online-Archiv NOA Biogeosciences 20 23 4751 4760 |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Limburg, Karin E. Heimbrand, Yvette Kuliński, Karol Marked recent declines in boron in Baltic Sea cod otoliths – a bellwether of incipient acidification in a vast hypoxic system? |
topic_facet |
article Verlagsveröffentlichung |
description |
Ocean acidification is spreading globally as a result of anthropogenic CO2 emissions, but the Baltic Sea has until recently been thought to be relatively well-buffered by terrigenous inputs of alkalinity from its watershed. We discovered a 3- to 5-fold decline in boron (as B : Ca) in otoliths of eastern Baltic cod (EBC) between the late 1990s and 2021. Examining a time series of EBC otoliths, we found varying levels of B : Ca starting in the 1980s, with the most recent years showing an all-time low for this period. This trend correlates with declines in pH and dissolved oxygen but not with changes in salinity. We examined possible physiological influences on B : Ca by including a collection of Icelandic cod as an “out-group”. Icelandic cod otoliths showed strongly positive correlations of B : Ca with physiologically regulated P : Ca; this was not the case for EBC. Finally, B : Ca in EBC otoliths is negatively correlated, to some extent, with Mn : Mg, a proposed proxy for hypoxia exposure. This negative relationship is hypothesized to reflect the dual phenomena of hypoxia and acidification as a result of decomposition of large algal blooms. Taken together, the otolith biomarkers Mn : Mg and B : Ca in cod suggest a general increase in both hypoxia and acidification within the Baltic intermediate and deep waters in the last decade. |
format |
Article in Journal/Newspaper |
author |
Limburg, Karin E. Heimbrand, Yvette Kuliński, Karol |
author_facet |
Limburg, Karin E. Heimbrand, Yvette Kuliński, Karol |
author_sort |
Limburg, Karin E. |
title |
Marked recent declines in boron in Baltic Sea cod otoliths – a bellwether of incipient acidification in a vast hypoxic system? |
title_short |
Marked recent declines in boron in Baltic Sea cod otoliths – a bellwether of incipient acidification in a vast hypoxic system? |
title_full |
Marked recent declines in boron in Baltic Sea cod otoliths – a bellwether of incipient acidification in a vast hypoxic system? |
title_fullStr |
Marked recent declines in boron in Baltic Sea cod otoliths – a bellwether of incipient acidification in a vast hypoxic system? |
title_full_unstemmed |
Marked recent declines in boron in Baltic Sea cod otoliths – a bellwether of incipient acidification in a vast hypoxic system? |
title_sort |
marked recent declines in boron in baltic sea cod otoliths – a bellwether of incipient acidification in a vast hypoxic system? |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/bg-20-4751-2023 https://noa.gwlb.de/receive/cop_mods_00070177 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00068533/bg-20-4751-2023.pdf https://bg.copernicus.org/articles/20/4751/2023/bg-20-4751-2023.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-20-4751-2023 https://noa.gwlb.de/receive/cop_mods_00070177 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00068533/bg-20-4751-2023.pdf https://bg.copernicus.org/articles/20/4751/2023/bg-20-4751-2023.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-20-4751-2023 |
container_title |
Biogeosciences |
container_volume |
20 |
container_issue |
23 |
container_start_page |
4751 |
op_container_end_page |
4760 |
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1786832459994759168 |