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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ftdoajarticles:oai:doaj.org/article:9d91fa6b675546a791470e5f462fd0fe 2023-05-15T15:27:19+02:00 Accuracy of Otolith Oxygen Isotope Records Analyzed by SIMS as an Index of Temperature Exposure of Wild Icelandic Cod (Gadus morhua) Gotje von Leesen Hlynur Bardarson Sæmundur Ari Halldórsson Martin J. Whitehouse Steven E. Campana 2021-10-01T00:00:00Z https://doi.org/10.3389/fmars.2021.698908 https://doaj.org/article/9d91fa6b675546a791470e5f462fd0fe EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2021.698908/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2021.698908 https://doaj.org/article/9d91fa6b675546a791470e5f462fd0fe Frontiers in Marine Science, Vol 8 (2021) accuracy Atlantic cod DST-tags SIMS stable oxygen isotopes Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2021 ftdoajarticles https://doi.org/10.3389/fmars.2021.698908 2022-12-31T07:48:27Z 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 (δ18O) value was predicted for each month of tagging and compared with δ18Ootolith values measured in situ with secondary ion mass spectrometry (SIMS). Paired-sample Wilcoxon tests were applied to compare measured and predicted δ18O values. The difference between measured and predicted mean and maximum δ18Ootolith values was not significant, suggesting a good correspondence between SIMS-measured and DST-predicted δ18Ootolith values. However, SIMS-measured and predicted minimum δ18Ootolith 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 δ18Ootolith values, which affected the estimation accuracy of absolute temperature. However, relative temperature changes were accurately estimated by SIMS-analyzed δ18Ootolith values. Article in Journal/Newspaper atlantic cod Gadus morhua Directory of Open Access Journals: DOAJ Articles Frontiers in Marine Science 8 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
accuracy Atlantic cod DST-tags SIMS stable oxygen isotopes Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
accuracy Atlantic cod DST-tags SIMS stable oxygen isotopes Science Q General. Including nature conservation geographical distribution QH1-199.5 Gotje von Leesen Hlynur Bardarson Sæmundur Ari Halldórsson Martin J. Whitehouse Steven E. Campana Accuracy of Otolith Oxygen Isotope Records Analyzed by SIMS as an Index of Temperature Exposure of Wild Icelandic Cod (Gadus morhua) |
topic_facet |
accuracy Atlantic cod DST-tags SIMS stable oxygen isotopes Science Q General. Including nature conservation geographical distribution QH1-199.5 |
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 (δ18O) value was predicted for each month of tagging and compared with δ18Ootolith values measured in situ with secondary ion mass spectrometry (SIMS). Paired-sample Wilcoxon tests were applied to compare measured and predicted δ18O values. The difference between measured and predicted mean and maximum δ18Ootolith values was not significant, suggesting a good correspondence between SIMS-measured and DST-predicted δ18Ootolith values. However, SIMS-measured and predicted minimum δ18Ootolith 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 δ18Ootolith values, which affected the estimation accuracy of absolute temperature. However, relative temperature changes were accurately estimated by SIMS-analyzed δ18Ootolith values. |
format |
Article in Journal/Newspaper |
author |
Gotje von Leesen Hlynur Bardarson Sæmundur Ari Halldórsson Martin J. Whitehouse Steven E. Campana |
author_facet |
Gotje von Leesen Hlynur Bardarson Sæmundur Ari Halldórsson Martin J. Whitehouse Steven E. Campana |
author_sort |
Gotje von Leesen |
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 S.A. |
publishDate |
2021 |
url |
https://doi.org/10.3389/fmars.2021.698908 https://doaj.org/article/9d91fa6b675546a791470e5f462fd0fe |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Frontiers in Marine Science, Vol 8 (2021) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2021.698908/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2021.698908 https://doaj.org/article/9d91fa6b675546a791470e5f462fd0fe |
op_doi |
https://doi.org/10.3389/fmars.2021.698908 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
_version_ |
1766357759491571712 |