Relationships Between Temperature, pH, and Crusting on Mg/Ca Ratios in Laboratory‐Grown Neogloboquadrina Foraminifera
Mg/Ca ratio paleothermometry in foraminifera is an important tool for the reconstruction and interpretation of past environments. However, existing Mg/Ca:temperature relationships for planktic species inhabiting middle- and high-latitude environments are limited by a lack of information about the de...
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ftcdlib:oai:escholarship.org:ark:/13030/qt5xk849zj 2023-06-18T03:40:02+02:00 Relationships Between Temperature, pH, and Crusting on Mg/Ca Ratios in Laboratory‐Grown Neogloboquadrina Foraminifera Davis, Catherine V Fehrenbacher, Jennifer S Hill, Tessa M Russell, Ann D Spero, Howard J 1137 - 1152 2017-11-01 application/pdf https://escholarship.org/uc/item/5xk849zj unknown eScholarship, University of California qt5xk849zj https://escholarship.org/uc/item/5xk849zj public Paleoceanography and Paleoclimatology, vol 32, iss 11 Life Below Water article 2017 ftcdlib 2023-06-05T18:00:11Z Mg/Ca ratio paleothermometry in foraminifera is an important tool for the reconstruction and interpretation of past environments. However, existing Mg/Ca:temperature relationships for planktic species inhabiting middle- and high-latitude environments are limited by a lack of information about the development and impact of low-Mg/Ca ratio “crusts” and the influence of the carbonate system on Mg/Ca ratios in these groups. To address this, we cultured individual specimens of Neogloboquadrina incompta and Neogloboquadrina pachyderma in seawater across a range of temperature (6°–12°C) and pH (7.4–8.2). We found by laser ablation inductively couple mass spectrometry analyses of shells that culture-grown crust calcite in N. incompta had a lower Mg/Ca ratio than ontogenetic calcite formed at the same temperature, suggesting that temperature is not responsible for the low-Mg/Ca ratio of neogloboquadrinid crusts. The Mg/Ca:temperature relationship for ontogenetic calcite in N. incompta was consistent with the previously published culture-based relationship, and no significant relationship was found between Mg/Ca ratios and pH in this species. However, the Mg/Ca ratio in laboratory-cultured N. pachyderma was much higher than that reported in previous core top and sediment trap samples, due to lack of crust formation in culture. Application of our ontogenetic calcite-specific Mg/Ca:temperature relationships to fossil N. pachyderma and N. incompta from five intervals in cores from the Santa Barbara Basin and the Bering Sea shows that excluding crust calcite in fossil specimens may improve Mg/Ca-based temperature estimates. Article in Journal/Newspaper Bering Sea Neogloboquadrina pachyderma University of California: eScholarship Bering Sea |
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University of California: eScholarship |
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Life Below Water |
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Life Below Water Davis, Catherine V Fehrenbacher, Jennifer S Hill, Tessa M Russell, Ann D Spero, Howard J Relationships Between Temperature, pH, and Crusting on Mg/Ca Ratios in Laboratory‐Grown Neogloboquadrina Foraminifera |
topic_facet |
Life Below Water |
description |
Mg/Ca ratio paleothermometry in foraminifera is an important tool for the reconstruction and interpretation of past environments. However, existing Mg/Ca:temperature relationships for planktic species inhabiting middle- and high-latitude environments are limited by a lack of information about the development and impact of low-Mg/Ca ratio “crusts” and the influence of the carbonate system on Mg/Ca ratios in these groups. To address this, we cultured individual specimens of Neogloboquadrina incompta and Neogloboquadrina pachyderma in seawater across a range of temperature (6°–12°C) and pH (7.4–8.2). We found by laser ablation inductively couple mass spectrometry analyses of shells that culture-grown crust calcite in N. incompta had a lower Mg/Ca ratio than ontogenetic calcite formed at the same temperature, suggesting that temperature is not responsible for the low-Mg/Ca ratio of neogloboquadrinid crusts. The Mg/Ca:temperature relationship for ontogenetic calcite in N. incompta was consistent with the previously published culture-based relationship, and no significant relationship was found between Mg/Ca ratios and pH in this species. However, the Mg/Ca ratio in laboratory-cultured N. pachyderma was much higher than that reported in previous core top and sediment trap samples, due to lack of crust formation in culture. Application of our ontogenetic calcite-specific Mg/Ca:temperature relationships to fossil N. pachyderma and N. incompta from five intervals in cores from the Santa Barbara Basin and the Bering Sea shows that excluding crust calcite in fossil specimens may improve Mg/Ca-based temperature estimates. |
format |
Article in Journal/Newspaper |
author |
Davis, Catherine V Fehrenbacher, Jennifer S Hill, Tessa M Russell, Ann D Spero, Howard J |
author_facet |
Davis, Catherine V Fehrenbacher, Jennifer S Hill, Tessa M Russell, Ann D Spero, Howard J |
author_sort |
Davis, Catherine V |
title |
Relationships Between Temperature, pH, and Crusting on Mg/Ca Ratios in Laboratory‐Grown Neogloboquadrina Foraminifera |
title_short |
Relationships Between Temperature, pH, and Crusting on Mg/Ca Ratios in Laboratory‐Grown Neogloboquadrina Foraminifera |
title_full |
Relationships Between Temperature, pH, and Crusting on Mg/Ca Ratios in Laboratory‐Grown Neogloboquadrina Foraminifera |
title_fullStr |
Relationships Between Temperature, pH, and Crusting on Mg/Ca Ratios in Laboratory‐Grown Neogloboquadrina Foraminifera |
title_full_unstemmed |
Relationships Between Temperature, pH, and Crusting on Mg/Ca Ratios in Laboratory‐Grown Neogloboquadrina Foraminifera |
title_sort |
relationships between temperature, ph, and crusting on mg/ca ratios in laboratory‐grown neogloboquadrina foraminifera |
publisher |
eScholarship, University of California |
publishDate |
2017 |
url |
https://escholarship.org/uc/item/5xk849zj |
op_coverage |
1137 - 1152 |
geographic |
Bering Sea |
geographic_facet |
Bering Sea |
genre |
Bering Sea Neogloboquadrina pachyderma |
genre_facet |
Bering Sea Neogloboquadrina pachyderma |
op_source |
Paleoceanography and Paleoclimatology, vol 32, iss 11 |
op_relation |
qt5xk849zj https://escholarship.org/uc/item/5xk849zj |
op_rights |
public |
_version_ |
1769004829741416448 |