Iodine-to-calcium ratios in deep-sea scleractinian and bamboo corals

Yun-Ju Sun; Laura F Robinson; Ian J Parkinson; Joseph A Stewart; Wanyi Lu; Dalton S Hardisty; Qian Liu; James Kershaw; Michèle LaVigne; Tristan J Horner

doi:10.3389/fmars.2023.1264380

Iodine-to-calcium ratios in deep-sea scleractinian and bamboo corals

Yun-Ju Sun
, Laura F Robinson
, Ian J Parkinson
, Joseph A Stewart
, Wanyi Lu
, Dalton S Hardisty
, Qian Liu
, James Kershaw
, Michèle LaVigne
, Tristan J Horner

Research output: Contribution to journal › Article (Academic Journal) › peer-review

8 Citations (Scopus)

Abstract

The distribution of dissolved iodine in seawater is sensitive to multiple biogeochemical cycles, including those of nitrogen and oxygen. The iodine-to-calcium ratio (I/Ca) of marine carbonates, such as bulk carbonate or foraminifera, has emerged as a potential proxy for changes in past seawater oxygenation. However, the utility of the I/Ca proxy in deep-sea corals, natural archives of seawater chemistry with wide spatial coverage and radiometric dating potential, remains unexplored. Here, we present the first I/Ca data obtained from modern deep-sea corals, specifically scleractinian and bamboo corals, collected from the Atlantic, Eastern Pacific, and Southern Oceans, encompassing a wide range of seawater oxygen concentrations (10–280 μmol/kg). In contrast to thermodynamic predictions, we observe higher I/Ca ratios in aragonitic corals (scleractinian) compared to calcitic corals (bamboo). This observation suggests a strong biological control during iodate incorporation into deep-sea coral skeletons. For the majority of scleractinian corals, I/Ca exhibits a covariation with local seawater iodate concentrations, which is closely related to seawater oxygen content. Scleractinian corals also exhibit notably lower I/Ca below a seawater oxygen threshold of approximately 160 μmol/kg. In contrast, no significant differences in I/Ca are found among bamboo corals across the range of oxygen concentrations encountered (15–240 μmol/kg). In the North Atlantic, several hydrographic factors, such as temperature and/or salinity, may additionally affect coral I/Ca. Our results highlight the potential of I/Ca ratios in deep-sea scleractinian corals to serve as an indicator of past seawater iodate concentrations, providing valuable insights into historical seawater oxygen levels.

Original language	English
Article number	1264380
Journal	Frontiers in Marine Science
Volume	10
DOIs	https://doi.org/10.3389/fmars.2023.1264380
Publication status	Published - 7 Dec 2023

Bibliographical note

Funding Information:
We acknowledge the crew and researchers on board the research vessels that obtained the samples for this study. We thank the Charles Darwin Foundation, Galápagos National Park, and INOCAR for Galápagos sampling. AL0508 was supported by The Dalio Explore Fund. We also acknowledge the Galápagos National Park directorate for permission to map and collect submarine rock and biological samples (PC-44-15) and the Charles Darwin Foundation for facilitating scientific collaboration in the Galápagos. Access to specimens from the Muséum National d’Histoire Naturelle (MNHN, Paris) was facilitated by Magalie Castelin (Cnidaria curator) and Jonathan Blettery (SYNTHESYS+, a grant awarded to James Kershaw). MNHN specimens were obtained during expedition MUSORSTOM 9, organised by the MNHN and the Institut de Recherche pour le Développement as part of the Tropical Deep-Sea Benthos program (previously MUSORSTOM). The authors are grateful to the cruise leader, Bertrand Richer de Forges, and to Helmut Zibrowius who identified the specimens. We acknowledge the support from Konrad Hughen providing international and in-house coral standards for iodine measurement. We thank Keyi Cheng, Maureen Auro, Jerzy S Blusztajn, Christopher D Coath, Jamie Lewis, Carolyn Taylor, Maria Luiza De Carvalho Ferreira, Yingchu Shen and Maoyu Wang for their help with laboratory work. We thank Jui-Yen Lin and Kuan-Yu Lin for the discussions on iodine speciation thermodynamics. We thank Zunli Lu and George W Luther as well as the Editor Alex J Poulton for their constructive comments that greatly improved the manuscript.

Funding Information:
The author(s) declare financial support was received for the research, authorship, and/or publication of this article. Funding for this work was provided by a bursary from Antarctic Science Ltd. and a Government Scholarship Program for overseas study from the Ministry of Education, Taiwan awarded to Y-J.S, and NERC grants awarded to LR (NE/S001743/1; NE/R005117/1; NE/N003861/1; NE/X00127X/1). Cruise DY081 was funded by the European Research Council starting grant ICY-LAB (Grant Agreement 678371). TH acknowledges support from the Woods Hole Oceanographic Institution’s President’s Innovation Fund and The Breene M. Kerr Early Career Scientist Endowment Fund. DH thanks NSF CO award # 1829406.

Funding Information:
The author(s) declare financial support was received for the research, authorship, and/or publication of this article. Funding for this work was provided by a bursary from Antarctic Science Ltd. and a Government Scholarship Program for overseas study from the Ministry of Education, Taiwan awarded to Y-J.S, and NERC grants awarded to LR (NE/S001743/1; NE/R005117/1; NE/N003861/1; NE/X00127X/1). Cruise DY081 was funded by the European Research Council starting grant ICY-LAB (Grant Agreement 678371). TH acknowledges support from the Woods Hole Oceanographic Institution’s President’s Innovation Fund and The Breene M. Kerr Early Career Scientist Endowment Fund. DH thanks NSF CO award # 1829406. Acknowledgments

Publisher Copyright:
Copyright © 2023 Sun, Robinson, Parkinson, Stewart, Lu, Hardisty, Liu, Kershaw, LaVigne and Horner.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 14 Life Below Water

Keywords

Earth Sciences--Oceanography
Seawater oxygen1
Iodine2
Deep-sea coral3
Scleractinian coral4
Bamboo coral5
Deep sea
Corals
Seawater
Biogeochemistry
Biological control
Deep water
Geochemistry
Hypoxia
Oxygenation
Archives
Mineralogy
Iodates
Oceans
Museums
Foraminifera
Radiometric dating
Carbonates
Calcium
Iodine
Biogeochemical cycles
Marine invertebrates
Oxidation
Oxygen
Archives & records
Biogeochemical cycle
Southern Ocean

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@article{1bac35c34b3d4e69919ffb3022ce4fd4,

title = "Iodine-to-calcium ratios in deep-sea scleractinian and bamboo corals",

abstract = "The distribution of dissolved iodine in seawater is sensitive to multiple biogeochemical cycles, including those of nitrogen and oxygen. The iodine-to-calcium ratio (I/Ca) of marine carbonates, such as bulk carbonate or foraminifera, has emerged as a potential proxy for changes in past seawater oxygenation. However, the utility of the I/Ca proxy in deep-sea corals, natural archives of seawater chemistry with wide spatial coverage and radiometric dating potential, remains unexplored. Here, we present the first I/Ca data obtained from modern deep-sea corals, specifically scleractinian and bamboo corals, collected from the Atlantic, Eastern Pacific, and Southern Oceans, encompassing a wide range of seawater oxygen concentrations (10–280 μmol/kg). In contrast to thermodynamic predictions, we observe higher I/Ca ratios in aragonitic corals (scleractinian) compared to calcitic corals (bamboo). This observation suggests a strong biological control during iodate incorporation into deep-sea coral skeletons. For the majority of scleractinian corals, I/Ca exhibits a covariation with local seawater iodate concentrations, which is closely related to seawater oxygen content. Scleractinian corals also exhibit notably lower I/Ca below a seawater oxygen threshold of approximately 160 μmol/kg. In contrast, no significant differences in I/Ca are found among bamboo corals across the range of oxygen concentrations encountered (15–240 μmol/kg). In the North Atlantic, several hydrographic factors, such as temperature and/or salinity, may additionally affect coral I/Ca. Our results highlight the potential of I/Ca ratios in deep-sea scleractinian corals to serve as an indicator of past seawater iodate concentrations, providing valuable insights into historical seawater oxygen levels.",

keywords = "Earth Sciences--Oceanography, Seawater oxygen1, Iodine2, Deep-sea coral3, Scleractinian coral4, Bamboo coral5, Deep sea, Corals, Seawater, Biogeochemistry, Biological control, Deep water, Geochemistry, Hypoxia, Oxygenation, Archives, Mineralogy, Iodates, Oceans, Museums, Foraminifera, Radiometric dating, Carbonates, Calcium, Iodine, Biogeochemical cycles, Marine invertebrates, Oxidation, Oxygen, Archives \& records, Biogeochemical cycle, Southern Ocean",

author = "Yun-Ju Sun and Robinson, \{Laura F\} and Parkinson, \{Ian J\} and Stewart, \{Joseph A\} and Wanyi Lu and Hardisty, \{Dalton S\} and Qian Liu and James Kershaw and Mich{\`e}le LaVigne and Horner, \{Tristan J\}",

note = "Funding Information: We acknowledge the crew and researchers on board the research vessels that obtained the samples for this study. We thank the Charles Darwin Foundation, Gal{\'a}pagos National Park, and INOCAR for Gal{\'a}pagos sampling. AL0508 was supported by The Dalio Explore Fund. We also acknowledge the Gal{\'a}pagos National Park directorate for permission to map and collect submarine rock and biological samples (PC-44-15) and the Charles Darwin Foundation for facilitating scientific collaboration in the Gal{\'a}pagos. Access to specimens from the Mus{\'e}um National d{\textquoteright}Histoire Naturelle (MNHN, Paris) was facilitated by Magalie Castelin (Cnidaria curator) and Jonathan Blettery (SYNTHESYS+, a grant awarded to James Kershaw). MNHN specimens were obtained during expedition MUSORSTOM 9, organised by the MNHN and the Institut de Recherche pour le D{\'e}veloppement as part of the Tropical Deep-Sea Benthos program (previously MUSORSTOM). The authors are grateful to the cruise leader, Bertrand Richer de Forges, and to Helmut Zibrowius who identified the specimens. We acknowledge the support from Konrad Hughen providing international and in-house coral standards for iodine measurement. We thank Keyi Cheng, Maureen Auro, Jerzy S Blusztajn, Christopher D Coath, Jamie Lewis, Carolyn Taylor, Maria Luiza De Carvalho Ferreira, Yingchu Shen and Maoyu Wang for their help with laboratory work. We thank Jui-Yen Lin and Kuan-Yu Lin for the discussions on iodine speciation thermodynamics. We thank Zunli Lu and George W Luther as well as the Editor Alex J Poulton for their constructive comments that greatly improved the manuscript. Funding Information: The author(s) declare financial support was received for the research, authorship, and/or publication of this article. Funding for this work was provided by a bursary from Antarctic Science Ltd. and a Government Scholarship Program for overseas study from the Ministry of Education, Taiwan awarded to Y-J.S, and NERC grants awarded to LR (NE/S001743/1; NE/R005117/1; NE/N003861/1; NE/X00127X/1). Cruise DY081 was funded by the European Research Council starting grant ICY-LAB (Grant Agreement 678371). TH acknowledges support from the Woods Hole Oceanographic Institution{\textquoteright}s President{\textquoteright}s Innovation Fund and The Breene M. Kerr Early Career Scientist Endowment Fund. DH thanks NSF CO award \# 1829406. Funding Information: The author(s) declare financial support was received for the research, authorship, and/or publication of this article. Funding for this work was provided by a bursary from Antarctic Science Ltd. and a Government Scholarship Program for overseas study from the Ministry of Education, Taiwan awarded to Y-J.S, and NERC grants awarded to LR (NE/S001743/1; NE/R005117/1; NE/N003861/1; NE/X00127X/1). Cruise DY081 was funded by the European Research Council starting grant ICY-LAB (Grant Agreement 678371). TH acknowledges support from the Woods Hole Oceanographic Institution{\textquoteright}s President{\textquoteright}s Innovation Fund and The Breene M. Kerr Early Career Scientist Endowment Fund. DH thanks NSF CO award \# 1829406. Acknowledgments Publisher Copyright: Copyright {\textcopyright} 2023 Sun, Robinson, Parkinson, Stewart, Lu, Hardisty, Liu, Kershaw, LaVigne and Horner.",

year = "2023",

month = dec,

day = "7",

doi = "10.3389/fmars.2023.1264380",

language = "English",

volume = "10",

journal = "Frontiers in Marine Science",

issn = "2296-7745",

publisher = "Frontiers Media S.A.",

}

TY - JOUR

T1 - Iodine-to-calcium ratios in deep-sea scleractinian and bamboo corals

AU - Sun, Yun-Ju

AU - Robinson, Laura F

AU - Parkinson, Ian J

AU - Stewart, Joseph A

AU - Lu, Wanyi

AU - Hardisty, Dalton S

AU - Liu, Qian

AU - Kershaw, James

AU - LaVigne, Michèle

AU - Horner, Tristan J

N1 - Funding Information: We acknowledge the crew and researchers on board the research vessels that obtained the samples for this study. We thank the Charles Darwin Foundation, Galápagos National Park, and INOCAR for Galápagos sampling. AL0508 was supported by The Dalio Explore Fund. We also acknowledge the Galápagos National Park directorate for permission to map and collect submarine rock and biological samples (PC-44-15) and the Charles Darwin Foundation for facilitating scientific collaboration in the Galápagos. Access to specimens from the Muséum National d’Histoire Naturelle (MNHN, Paris) was facilitated by Magalie Castelin (Cnidaria curator) and Jonathan Blettery (SYNTHESYS+, a grant awarded to James Kershaw). MNHN specimens were obtained during expedition MUSORSTOM 9, organised by the MNHN and the Institut de Recherche pour le Développement as part of the Tropical Deep-Sea Benthos program (previously MUSORSTOM). The authors are grateful to the cruise leader, Bertrand Richer de Forges, and to Helmut Zibrowius who identified the specimens. We acknowledge the support from Konrad Hughen providing international and in-house coral standards for iodine measurement. We thank Keyi Cheng, Maureen Auro, Jerzy S Blusztajn, Christopher D Coath, Jamie Lewis, Carolyn Taylor, Maria Luiza De Carvalho Ferreira, Yingchu Shen and Maoyu Wang for their help with laboratory work. We thank Jui-Yen Lin and Kuan-Yu Lin for the discussions on iodine speciation thermodynamics. We thank Zunli Lu and George W Luther as well as the Editor Alex J Poulton for their constructive comments that greatly improved the manuscript. Funding Information: The author(s) declare financial support was received for the research, authorship, and/or publication of this article. Funding for this work was provided by a bursary from Antarctic Science Ltd. and a Government Scholarship Program for overseas study from the Ministry of Education, Taiwan awarded to Y-J.S, and NERC grants awarded to LR (NE/S001743/1; NE/R005117/1; NE/N003861/1; NE/X00127X/1). Cruise DY081 was funded by the European Research Council starting grant ICY-LAB (Grant Agreement 678371). TH acknowledges support from the Woods Hole Oceanographic Institution’s President’s Innovation Fund and The Breene M. Kerr Early Career Scientist Endowment Fund. DH thanks NSF CO award # 1829406. Funding Information: The author(s) declare financial support was received for the research, authorship, and/or publication of this article. Funding for this work was provided by a bursary from Antarctic Science Ltd. and a Government Scholarship Program for overseas study from the Ministry of Education, Taiwan awarded to Y-J.S, and NERC grants awarded to LR (NE/S001743/1; NE/R005117/1; NE/N003861/1; NE/X00127X/1). Cruise DY081 was funded by the European Research Council starting grant ICY-LAB (Grant Agreement 678371). TH acknowledges support from the Woods Hole Oceanographic Institution’s President’s Innovation Fund and The Breene M. Kerr Early Career Scientist Endowment Fund. DH thanks NSF CO award # 1829406. Acknowledgments Publisher Copyright: Copyright © 2023 Sun, Robinson, Parkinson, Stewart, Lu, Hardisty, Liu, Kershaw, LaVigne and Horner.

PY - 2023/12/7

Y1 - 2023/12/7

N2 - The distribution of dissolved iodine in seawater is sensitive to multiple biogeochemical cycles, including those of nitrogen and oxygen. The iodine-to-calcium ratio (I/Ca) of marine carbonates, such as bulk carbonate or foraminifera, has emerged as a potential proxy for changes in past seawater oxygenation. However, the utility of the I/Ca proxy in deep-sea corals, natural archives of seawater chemistry with wide spatial coverage and radiometric dating potential, remains unexplored. Here, we present the first I/Ca data obtained from modern deep-sea corals, specifically scleractinian and bamboo corals, collected from the Atlantic, Eastern Pacific, and Southern Oceans, encompassing a wide range of seawater oxygen concentrations (10–280 μmol/kg). In contrast to thermodynamic predictions, we observe higher I/Ca ratios in aragonitic corals (scleractinian) compared to calcitic corals (bamboo). This observation suggests a strong biological control during iodate incorporation into deep-sea coral skeletons. For the majority of scleractinian corals, I/Ca exhibits a covariation with local seawater iodate concentrations, which is closely related to seawater oxygen content. Scleractinian corals also exhibit notably lower I/Ca below a seawater oxygen threshold of approximately 160 μmol/kg. In contrast, no significant differences in I/Ca are found among bamboo corals across the range of oxygen concentrations encountered (15–240 μmol/kg). In the North Atlantic, several hydrographic factors, such as temperature and/or salinity, may additionally affect coral I/Ca. Our results highlight the potential of I/Ca ratios in deep-sea scleractinian corals to serve as an indicator of past seawater iodate concentrations, providing valuable insights into historical seawater oxygen levels.

AB - The distribution of dissolved iodine in seawater is sensitive to multiple biogeochemical cycles, including those of nitrogen and oxygen. The iodine-to-calcium ratio (I/Ca) of marine carbonates, such as bulk carbonate or foraminifera, has emerged as a potential proxy for changes in past seawater oxygenation. However, the utility of the I/Ca proxy in deep-sea corals, natural archives of seawater chemistry with wide spatial coverage and radiometric dating potential, remains unexplored. Here, we present the first I/Ca data obtained from modern deep-sea corals, specifically scleractinian and bamboo corals, collected from the Atlantic, Eastern Pacific, and Southern Oceans, encompassing a wide range of seawater oxygen concentrations (10–280 μmol/kg). In contrast to thermodynamic predictions, we observe higher I/Ca ratios in aragonitic corals (scleractinian) compared to calcitic corals (bamboo). This observation suggests a strong biological control during iodate incorporation into deep-sea coral skeletons. For the majority of scleractinian corals, I/Ca exhibits a covariation with local seawater iodate concentrations, which is closely related to seawater oxygen content. Scleractinian corals also exhibit notably lower I/Ca below a seawater oxygen threshold of approximately 160 μmol/kg. In contrast, no significant differences in I/Ca are found among bamboo corals across the range of oxygen concentrations encountered (15–240 μmol/kg). In the North Atlantic, several hydrographic factors, such as temperature and/or salinity, may additionally affect coral I/Ca. Our results highlight the potential of I/Ca ratios in deep-sea scleractinian corals to serve as an indicator of past seawater iodate concentrations, providing valuable insights into historical seawater oxygen levels.

KW - Earth Sciences--Oceanography

KW - Seawater oxygen1

KW - Iodine2

KW - Deep-sea coral3

KW - Scleractinian coral4

KW - Bamboo coral5

KW - Deep sea

KW - Corals

KW - Seawater

KW - Biogeochemistry

KW - Biological control

KW - Deep water

KW - Geochemistry

KW - Hypoxia

KW - Oxygenation

KW - Archives

KW - Mineralogy

KW - Iodates

KW - Oceans

KW - Museums

KW - Foraminifera

KW - Radiometric dating

KW - Carbonates

KW - Calcium

KW - Iodine

KW - Biogeochemical cycles

KW - Marine invertebrates

KW - Oxidation

KW - Oxygen

KW - Archives & records

KW - Biogeochemical cycle

KW - Southern Ocean

U2 - 10.3389/fmars.2023.1264380

DO - 10.3389/fmars.2023.1264380

M3 - Article (Academic Journal)

SN - 2296-7745

VL - 10

JO - Frontiers in Marine Science

JF - Frontiers in Marine Science

M1 - 1264380

ER -

Iodine-to-calcium ratios in deep-sea scleractinian and bamboo corals

Abstract

Bibliographical note

UN SDGs

Keywords

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