Nitrogen isotopic composition of planktonic foraminifera from the modern ocean and recent sediments
We investigated the controls on the δ 15 N values of shell‐bound organic matter of planktonic foraminifera (foraminifera‐bound δ 15 N, or FB‐ δ 15 N). The bulk biomass δ 15 N of live foraminifera collected from plankton tows at Sta. S in the Sargasso Sea is within ∼1‰ of the FB‐ δ 15 N of the same s...
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crwiley:10.4319/lo.2012.57.4.1011 2024-06-23T07:55:20+00:00 Nitrogen isotopic composition of planktonic foraminifera from the modern ocean and recent sediments Ren, Haojia Sigman, Daniel M. Thunell, Robert C. Prokopenko, Maria G. 2012 http://dx.doi.org/10.4319/lo.2012.57.4.1011 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2012.57.4.1011 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2012.57.4.1011 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 57, issue 4, page 1011-1024 ISSN 0024-3590 1939-5590 journal-article 2012 crwiley https://doi.org/10.4319/lo.2012.57.4.1011 2024-06-06T04:23:17Z We investigated the controls on the δ 15 N values of shell‐bound organic matter of planktonic foraminifera (foraminifera‐bound δ 15 N, or FB‐ δ 15 N). The bulk biomass δ 15 N of live foraminifera collected from plankton tows at Sta. S in the Sargasso Sea is within ∼1‰ of the FB‐ δ 15 N of the same species picked from surface sediments from the low‐latitude North Atlantic. The FB‐ δ 15 N value in the surface sediments is strongly correlated with the δ 15 N of thermocline nitrate, the dominant source of new N to the euphotic zone. The three euphotic‐zone‐dwelling, symbiotic, spinose species, Globigerinoides ruber , Globigerinoides sacculifer , and Orbulina universa , have a FB‐ δ 15 N similar to or slightly higher than that of the nitrate supply to the euphotic zone, whereas the deeper‐dwelling, non‐spinose, and/or asymbiotic forms have higher δ 15 N. In the Cariaco Basin sediment trap samples, the FB‐ δ 15 N of O. universa varies substantially (1.2‰ between the lowest and highest value), in some cases in step with δ 15 N changes in the bulk sinking N, while the subeuphotic‐zone‐dwelling, asymbiotic, and/or non‐spinose species are generally higher in FB‐ δ 15 N and less variable through the time series. The higher and less temporally variable FB‐ δ 15 N values of the deeper dwellers are consistent with their partial reliance on subsurface suspended particulate nitrogen, the δ 15 N of which is elevated and relatively stable over time. As an alternative, possibly additional explanation for the lower FB‐ δ 15 N of the euphotic‐zone dwellers (despite their likely tendency to feed on high‐ δ 15 N zooplankton), the dinoflagellate symbionts may reduce the δ 15 N elevation of a foraminifera's biomass relative to its diet by reducing the efflux of low‐ δ 15 N ammonium. Article in Journal/Newspaper North Atlantic Planktonic foraminifera Wiley Online Library Limnology and Oceanography 57 4 1011 1024 |
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Wiley Online Library |
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English |
description |
We investigated the controls on the δ 15 N values of shell‐bound organic matter of planktonic foraminifera (foraminifera‐bound δ 15 N, or FB‐ δ 15 N). The bulk biomass δ 15 N of live foraminifera collected from plankton tows at Sta. S in the Sargasso Sea is within ∼1‰ of the FB‐ δ 15 N of the same species picked from surface sediments from the low‐latitude North Atlantic. The FB‐ δ 15 N value in the surface sediments is strongly correlated with the δ 15 N of thermocline nitrate, the dominant source of new N to the euphotic zone. The three euphotic‐zone‐dwelling, symbiotic, spinose species, Globigerinoides ruber , Globigerinoides sacculifer , and Orbulina universa , have a FB‐ δ 15 N similar to or slightly higher than that of the nitrate supply to the euphotic zone, whereas the deeper‐dwelling, non‐spinose, and/or asymbiotic forms have higher δ 15 N. In the Cariaco Basin sediment trap samples, the FB‐ δ 15 N of O. universa varies substantially (1.2‰ between the lowest and highest value), in some cases in step with δ 15 N changes in the bulk sinking N, while the subeuphotic‐zone‐dwelling, asymbiotic, and/or non‐spinose species are generally higher in FB‐ δ 15 N and less variable through the time series. The higher and less temporally variable FB‐ δ 15 N values of the deeper dwellers are consistent with their partial reliance on subsurface suspended particulate nitrogen, the δ 15 N of which is elevated and relatively stable over time. As an alternative, possibly additional explanation for the lower FB‐ δ 15 N of the euphotic‐zone dwellers (despite their likely tendency to feed on high‐ δ 15 N zooplankton), the dinoflagellate symbionts may reduce the δ 15 N elevation of a foraminifera's biomass relative to its diet by reducing the efflux of low‐ δ 15 N ammonium. |
format |
Article in Journal/Newspaper |
author |
Ren, Haojia Sigman, Daniel M. Thunell, Robert C. Prokopenko, Maria G. |
spellingShingle |
Ren, Haojia Sigman, Daniel M. Thunell, Robert C. Prokopenko, Maria G. Nitrogen isotopic composition of planktonic foraminifera from the modern ocean and recent sediments |
author_facet |
Ren, Haojia Sigman, Daniel M. Thunell, Robert C. Prokopenko, Maria G. |
author_sort |
Ren, Haojia |
title |
Nitrogen isotopic composition of planktonic foraminifera from the modern ocean and recent sediments |
title_short |
Nitrogen isotopic composition of planktonic foraminifera from the modern ocean and recent sediments |
title_full |
Nitrogen isotopic composition of planktonic foraminifera from the modern ocean and recent sediments |
title_fullStr |
Nitrogen isotopic composition of planktonic foraminifera from the modern ocean and recent sediments |
title_full_unstemmed |
Nitrogen isotopic composition of planktonic foraminifera from the modern ocean and recent sediments |
title_sort |
nitrogen isotopic composition of planktonic foraminifera from the modern ocean and recent sediments |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.4319/lo.2012.57.4.1011 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2012.57.4.1011 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2012.57.4.1011 |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
Limnology and Oceanography volume 57, issue 4, page 1011-1024 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2012.57.4.1011 |
container_title |
Limnology and Oceanography |
container_volume |
57 |
container_issue |
4 |
container_start_page |
1011 |
op_container_end_page |
1024 |
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1802647885751255040 |