“Live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore South Georgia, Southern Ocean: implications for calcification depths
It is widely held that benthic foraminifera exhibit species-specific calcification depth preferences, with their tests recording sediment pore water chemistry at that depth (i.e. stable isotope and trace metal compositions). This assumed depth-habitat-specific pore water chemistry relationship has b...
Published in: | Journal of Micropalaeontology |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00007647 2023-05-15T13:34:49+02:00 “Live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore South Georgia, Southern Ocean: implications for calcification depths Dejardin, Rowan Kender, Sev Allen, Claire S. Leng, Melanie J. Swann, George E. A. Peck, Victoria L. 2018-01 electronic https://doi.org/10.5194/jm-37-25-2018 https://noa.gwlb.de/receive/cop_mods_00007647 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007604/jm-37-25-2018.pdf https://jm.copernicus.org/articles/37/25/2018/jm-37-25-2018.pdf eng eng Copernicus Publications Journal of Micropalaeontology -- http://www.bibliothek.uni-regensburg.de/ezeit/?2053393 -- https://www.j-micropalaeontol.net/volumes.html -- http://jm.geoscienceworld.org/ -- 2041-4978 https://doi.org/10.5194/jm-37-25-2018 https://noa.gwlb.de/receive/cop_mods_00007647 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007604/jm-37-25-2018.pdf https://jm.copernicus.org/articles/37/25/2018/jm-37-25-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/jm-37-25-2018 2022-02-08T22:58:25Z It is widely held that benthic foraminifera exhibit species-specific calcification depth preferences, with their tests recording sediment pore water chemistry at that depth (i.e. stable isotope and trace metal compositions). This assumed depth-habitat-specific pore water chemistry relationship has been used to reconstruct various palaeoenvironmental parameters, such as bottom water oxygenation. However, many deep-water foraminiferal studies show wide intra-species variation in sediment living depth but relatively narrow intra-species variation in stable isotope composition. To investigate this depth-habitat–stable-isotope relationship on the shelf, we analysed depth distribution and stable isotopes of living (Rose Bengal stained) benthic foraminifera from two box cores collected on the South Georgia shelf (ranging from 250 to 300 m water depth). We provide a comprehensive taxonomic analysis of the benthic fauna, comprising 79 taxonomic groupings. The fauna shows close affinities with shelf assemblages from around Antarctica. We find live specimens of a number of calcareous species from a range of depths in the sediment column. Stable isotope ratios (δ13C and δ18O) were measured on stained specimens of three species, Astrononion echolsi, Cassidulinoides porrectus, and Buccella sp. 1, at 1 cm depth intervals within the downcore sediment sequences. In agreement with studies in deep-water settings, we find no significant intra-species variability in either δ13Cforam or δ18Oforam with sediment living depth on the South Georgia shelf. Our findings add to the growing evidence that infaunal benthic foraminiferal species calcify at a fixed depth. Given the wide range of depths at which we find living, infaunal species, we speculate that they may actually calcify predominantly at the sediment–seawater interface, where carbonate ion concentration and organic carbon availability is at a maximum. Article in Journal/Newspaper Antarc* Antarctica Southern Ocean Niedersächsisches Online-Archiv NOA Southern Ocean Journal of Micropalaeontology 37 1 25 71 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Dejardin, Rowan Kender, Sev Allen, Claire S. Leng, Melanie J. Swann, George E. A. Peck, Victoria L. “Live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore South Georgia, Southern Ocean: implications for calcification depths |
topic_facet |
article Verlagsveröffentlichung |
description |
It is widely held that benthic foraminifera exhibit species-specific calcification depth preferences, with their tests recording sediment pore water chemistry at that depth (i.e. stable isotope and trace metal compositions). This assumed depth-habitat-specific pore water chemistry relationship has been used to reconstruct various palaeoenvironmental parameters, such as bottom water oxygenation. However, many deep-water foraminiferal studies show wide intra-species variation in sediment living depth but relatively narrow intra-species variation in stable isotope composition. To investigate this depth-habitat–stable-isotope relationship on the shelf, we analysed depth distribution and stable isotopes of living (Rose Bengal stained) benthic foraminifera from two box cores collected on the South Georgia shelf (ranging from 250 to 300 m water depth). We provide a comprehensive taxonomic analysis of the benthic fauna, comprising 79 taxonomic groupings. The fauna shows close affinities with shelf assemblages from around Antarctica. We find live specimens of a number of calcareous species from a range of depths in the sediment column. Stable isotope ratios (δ13C and δ18O) were measured on stained specimens of three species, Astrononion echolsi, Cassidulinoides porrectus, and Buccella sp. 1, at 1 cm depth intervals within the downcore sediment sequences. In agreement with studies in deep-water settings, we find no significant intra-species variability in either δ13Cforam or δ18Oforam with sediment living depth on the South Georgia shelf. Our findings add to the growing evidence that infaunal benthic foraminiferal species calcify at a fixed depth. Given the wide range of depths at which we find living, infaunal species, we speculate that they may actually calcify predominantly at the sediment–seawater interface, where carbonate ion concentration and organic carbon availability is at a maximum. |
format |
Article in Journal/Newspaper |
author |
Dejardin, Rowan Kender, Sev Allen, Claire S. Leng, Melanie J. Swann, George E. A. Peck, Victoria L. |
author_facet |
Dejardin, Rowan Kender, Sev Allen, Claire S. Leng, Melanie J. Swann, George E. A. Peck, Victoria L. |
author_sort |
Dejardin, Rowan |
title |
“Live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore South Georgia, Southern Ocean: implications for calcification depths |
title_short |
“Live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore South Georgia, Southern Ocean: implications for calcification depths |
title_full |
“Live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore South Georgia, Southern Ocean: implications for calcification depths |
title_fullStr |
“Live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore South Georgia, Southern Ocean: implications for calcification depths |
title_full_unstemmed |
“Live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore South Georgia, Southern Ocean: implications for calcification depths |
title_sort |
“live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore south georgia, southern ocean: implications for calcification depths |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/jm-37-25-2018 https://noa.gwlb.de/receive/cop_mods_00007647 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007604/jm-37-25-2018.pdf https://jm.copernicus.org/articles/37/25/2018/jm-37-25-2018.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_relation |
Journal of Micropalaeontology -- http://www.bibliothek.uni-regensburg.de/ezeit/?2053393 -- https://www.j-micropalaeontol.net/volumes.html -- http://jm.geoscienceworld.org/ -- 2041-4978 https://doi.org/10.5194/jm-37-25-2018 https://noa.gwlb.de/receive/cop_mods_00007647 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007604/jm-37-25-2018.pdf https://jm.copernicus.org/articles/37/25/2018/jm-37-25-2018.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/jm-37-25-2018 |
container_title |
Journal of Micropalaeontology |
container_volume |
37 |
container_issue |
1 |
container_start_page |
25 |
op_container_end_page |
71 |
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1766058079898566656 |