Accuracy of Otolith Oxygen Isotope Records Analyzed by SIMS as an Index of Temperature Exposure of Wild Icelandic Cod (Gadus morhua)
Global warming is increasing ocean temperatures, forcing marine organisms to respond to a suite of changing environmental conditions. The stable oxygen isotopic composition of otoliths is often used as an index of temperature exposure, but the accuracy of the resulting temperature reconstructions in...
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Online Access: | http://dx.doi.org/10.3389/fmars.2021.698908 https://www.frontiersin.org/articles/10.3389/fmars.2021.698908/full |
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crfrontiers:10.3389/fmars.2021.698908 2024-02-11T10:02:00+01:00 Accuracy of Otolith Oxygen Isotope Records Analyzed by SIMS as an Index of Temperature Exposure of Wild Icelandic Cod (Gadus morhua) von Leesen, Gotje Bardarson, Hlynur Halldórsson, Sæmundur Ari Whitehouse, Martin J. Campana, Steven E. 2021 http://dx.doi.org/10.3389/fmars.2021.698908 https://www.frontiersin.org/articles/10.3389/fmars.2021.698908/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Marine Science volume 8 ISSN 2296-7745 Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography journal-article 2021 crfrontiers https://doi.org/10.3389/fmars.2021.698908 2024-01-26T10:00:05Z Global warming is increasing ocean temperatures, forcing marine organisms to respond to a suite of changing environmental conditions. The stable oxygen isotopic composition of otoliths is often used as an index of temperature exposure, but the accuracy of the resulting temperature reconstructions in wild, free-swimming Atlantic cod ( Gadus morhua ) has never been groundtruthed. Based on temperatures from data storage tags (DST) and corresponding salinity values, the stable oxygen isotope (δ 18 O) value was predicted for each month of tagging and compared with δ 18 O otolith values measured in situ with secondary ion mass spectrometry (SIMS). Paired-sample Wilcoxon tests were applied to compare measured and predicted δ 18 O values. The difference between measured and predicted mean and maximum δ 18 O otolith values was not significant, suggesting a good correspondence between SIMS-measured and DST-predicted δ 18 O ot olith values. However, SIMS-measured and predicted minimum δ 18 O otolith values were significantly different (all samples: p < 0.01, coastal and frontal cod: p < 0.05), resulting in overestimation of maximum temperatures. Our results confirm that otoliths are well-suited as proxies for mean ambient temperature reconstructions. A possible matrix effect and the absence of a reliable aragonite standard for SIMS measurements appeared to cause a small divergence between measured and predicted δ 18 O otolith values, which affected the estimation accuracy of absolute temperature. However, relative temperature changes were accurately estimated by SIMS-analyzed δ 18 O otolith values. Article in Journal/Newspaper atlantic cod Gadus morhua Frontiers (Publisher) Frontiers in Marine Science 8 |
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Frontiers (Publisher) |
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crfrontiers |
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topic |
Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography |
spellingShingle |
Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography von Leesen, Gotje Bardarson, Hlynur Halldórsson, Sæmundur Ari Whitehouse, Martin J. Campana, Steven E. Accuracy of Otolith Oxygen Isotope Records Analyzed by SIMS as an Index of Temperature Exposure of Wild Icelandic Cod (Gadus morhua) |
topic_facet |
Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography |
description |
Global warming is increasing ocean temperatures, forcing marine organisms to respond to a suite of changing environmental conditions. The stable oxygen isotopic composition of otoliths is often used as an index of temperature exposure, but the accuracy of the resulting temperature reconstructions in wild, free-swimming Atlantic cod ( Gadus morhua ) has never been groundtruthed. Based on temperatures from data storage tags (DST) and corresponding salinity values, the stable oxygen isotope (δ 18 O) value was predicted for each month of tagging and compared with δ 18 O otolith values measured in situ with secondary ion mass spectrometry (SIMS). Paired-sample Wilcoxon tests were applied to compare measured and predicted δ 18 O values. The difference between measured and predicted mean and maximum δ 18 O otolith values was not significant, suggesting a good correspondence between SIMS-measured and DST-predicted δ 18 O ot olith values. However, SIMS-measured and predicted minimum δ 18 O otolith values were significantly different (all samples: p < 0.01, coastal and frontal cod: p < 0.05), resulting in overestimation of maximum temperatures. Our results confirm that otoliths are well-suited as proxies for mean ambient temperature reconstructions. A possible matrix effect and the absence of a reliable aragonite standard for SIMS measurements appeared to cause a small divergence between measured and predicted δ 18 O otolith values, which affected the estimation accuracy of absolute temperature. However, relative temperature changes were accurately estimated by SIMS-analyzed δ 18 O otolith values. |
format |
Article in Journal/Newspaper |
author |
von Leesen, Gotje Bardarson, Hlynur Halldórsson, Sæmundur Ari Whitehouse, Martin J. Campana, Steven E. |
author_facet |
von Leesen, Gotje Bardarson, Hlynur Halldórsson, Sæmundur Ari Whitehouse, Martin J. Campana, Steven E. |
author_sort |
von Leesen, Gotje |
title |
Accuracy of Otolith Oxygen Isotope Records Analyzed by SIMS as an Index of Temperature Exposure of Wild Icelandic Cod (Gadus morhua) |
title_short |
Accuracy of Otolith Oxygen Isotope Records Analyzed by SIMS as an Index of Temperature Exposure of Wild Icelandic Cod (Gadus morhua) |
title_full |
Accuracy of Otolith Oxygen Isotope Records Analyzed by SIMS as an Index of Temperature Exposure of Wild Icelandic Cod (Gadus morhua) |
title_fullStr |
Accuracy of Otolith Oxygen Isotope Records Analyzed by SIMS as an Index of Temperature Exposure of Wild Icelandic Cod (Gadus morhua) |
title_full_unstemmed |
Accuracy of Otolith Oxygen Isotope Records Analyzed by SIMS as an Index of Temperature Exposure of Wild Icelandic Cod (Gadus morhua) |
title_sort |
accuracy of otolith oxygen isotope records analyzed by sims as an index of temperature exposure of wild icelandic cod (gadus morhua) |
publisher |
Frontiers Media SA |
publishDate |
2021 |
url |
http://dx.doi.org/10.3389/fmars.2021.698908 https://www.frontiersin.org/articles/10.3389/fmars.2021.698908/full |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Frontiers in Marine Science volume 8 ISSN 2296-7745 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fmars.2021.698908 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
_version_ |
1790597887200067584 |