Effects of alkalinity and salinity at low and high light intensity on hydrogen isotope fractionation of long-chain alkenones produced by <i>Emiliania huxleyi</i>
Over the last decade, hydrogen isotopes of long-chain alkenones have been shown to be a promising proxy for reconstructing paleo sea surface salinity due to a strong hydrogen isotope fractionation response to salinity across different environmental conditions. However, to date, the decoupling of...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2017-12-01
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| Series: | Biogeosciences |
| Online Access: | https://www.biogeosciences.net/14/5693/2017/bg-14-5693-2017.pdf |
| _version_ | 1811197913164939264 |
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| author | G. M. Weiss E. Y. Pfannerstill S. Schouten S. Schouten J. S. Sinninghe Damsté J. S. Sinninghe Damsté M. T. J. van der Meer |
| author_facet | G. M. Weiss E. Y. Pfannerstill S. Schouten S. Schouten J. S. Sinninghe Damsté J. S. Sinninghe Damsté M. T. J. van der Meer |
| author_sort | G. M. Weiss |
| collection | DOAJ |
| description | Over the last decade, hydrogen isotopes of long-chain alkenones have been
shown to be a promising proxy for reconstructing paleo sea surface salinity
due to a strong hydrogen isotope fractionation response to salinity across
different environmental conditions. However, to date, the decoupling of the
effects of alkalinity and salinity, parameters that co-vary in the surface
ocean, on hydrogen isotope fractionation of alkenones has not been assessed.
Furthermore, as the alkenone-producing haptophyte, <i>Emiliania
huxleyi</i>, is known to grow in large blooms under high light intensities, the
effect of salinity on hydrogen isotope fractionation under these high
irradiances is important to constrain before using <i>δ</i>D<sub>C<sub>37</sub></sub>
to reconstruct paleosalinity. Batch cultures of the marine haptophyte
<i>E. huxleyi</i> strain CCMP 1516 were grown to investigate the hydrogen
isotope fractionation response to salinity at high light intensity and
independently assess the effects of salinity and alkalinity under low-light
conditions. Our results suggest that alkalinity does not significantly
influence hydrogen isotope fractionation of alkenones, but salinity does have
a strong effect. Additionally, no significant difference was observed between
the fractionation responses to salinity recorded in alkenones grown under
both high- and low-light conditions. Comparison with previous studies suggests
that the fractionation response to salinity in culture is similar under
different environmental conditions, strengthening the use of hydrogen isotope
fractionation as a paleosalinity proxy. |
| first_indexed | 2024-04-12T01:22:12Z |
| format | Article |
| id | doaj.art-c5d00af1782f4b709d256c8ccaa49a95 |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-04-12T01:22:12Z |
| publishDate | 2017-12-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-c5d00af1782f4b709d256c8ccaa49a952022-12-22T03:53:46ZengCopernicus PublicationsBiogeosciences1726-41701726-41892017-12-01145693570410.5194/bg-14-5693-2017Effects of alkalinity and salinity at low and high light intensity on hydrogen isotope fractionation of long-chain alkenones produced by <i>Emiliania huxleyi</i>G. M. Weiss0E. Y. Pfannerstill1S. Schouten2S. Schouten3J. S. Sinninghe Damsté4J. S. Sinninghe Damsté5M. T. J. van der Meer6Department of Marine Microbiology and Biogeochemistry, NIOZ, Royal Netherlands Institute for Sea Research and Utrecht University, Den Burg, 1790 AB, the NetherlandsDepartment of Marine Microbiology and Biogeochemistry, NIOZ, Royal Netherlands Institute for Sea Research and Utrecht University, Den Burg, 1790 AB, the NetherlandsDepartment of Marine Microbiology and Biogeochemistry, NIOZ, Royal Netherlands Institute for Sea Research and Utrecht University, Den Burg, 1790 AB, the NetherlandsDepartment of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht, the NetherlandsDepartment of Marine Microbiology and Biogeochemistry, NIOZ, Royal Netherlands Institute for Sea Research and Utrecht University, Den Burg, 1790 AB, the NetherlandsDepartment of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht, the NetherlandsDepartment of Marine Microbiology and Biogeochemistry, NIOZ, Royal Netherlands Institute for Sea Research and Utrecht University, Den Burg, 1790 AB, the NetherlandsOver the last decade, hydrogen isotopes of long-chain alkenones have been shown to be a promising proxy for reconstructing paleo sea surface salinity due to a strong hydrogen isotope fractionation response to salinity across different environmental conditions. However, to date, the decoupling of the effects of alkalinity and salinity, parameters that co-vary in the surface ocean, on hydrogen isotope fractionation of alkenones has not been assessed. Furthermore, as the alkenone-producing haptophyte, <i>Emiliania huxleyi</i>, is known to grow in large blooms under high light intensities, the effect of salinity on hydrogen isotope fractionation under these high irradiances is important to constrain before using <i>δ</i>D<sub>C<sub>37</sub></sub> to reconstruct paleosalinity. Batch cultures of the marine haptophyte <i>E. huxleyi</i> strain CCMP 1516 were grown to investigate the hydrogen isotope fractionation response to salinity at high light intensity and independently assess the effects of salinity and alkalinity under low-light conditions. Our results suggest that alkalinity does not significantly influence hydrogen isotope fractionation of alkenones, but salinity does have a strong effect. Additionally, no significant difference was observed between the fractionation responses to salinity recorded in alkenones grown under both high- and low-light conditions. Comparison with previous studies suggests that the fractionation response to salinity in culture is similar under different environmental conditions, strengthening the use of hydrogen isotope fractionation as a paleosalinity proxy.https://www.biogeosciences.net/14/5693/2017/bg-14-5693-2017.pdf |
| spellingShingle | G. M. Weiss E. Y. Pfannerstill S. Schouten S. Schouten J. S. Sinninghe Damsté J. S. Sinninghe Damsté M. T. J. van der Meer Effects of alkalinity and salinity at low and high light intensity on hydrogen isotope fractionation of long-chain alkenones produced by <i>Emiliania huxleyi</i> Biogeosciences |
| title | Effects of alkalinity and salinity at low and high light intensity on hydrogen isotope fractionation of long-chain alkenones produced by <i>Emiliania huxleyi</i> |
| title_full | Effects of alkalinity and salinity at low and high light intensity on hydrogen isotope fractionation of long-chain alkenones produced by <i>Emiliania huxleyi</i> |
| title_fullStr | Effects of alkalinity and salinity at low and high light intensity on hydrogen isotope fractionation of long-chain alkenones produced by <i>Emiliania huxleyi</i> |
| title_full_unstemmed | Effects of alkalinity and salinity at low and high light intensity on hydrogen isotope fractionation of long-chain alkenones produced by <i>Emiliania huxleyi</i> |
| title_short | Effects of alkalinity and salinity at low and high light intensity on hydrogen isotope fractionation of long-chain alkenones produced by <i>Emiliania huxleyi</i> |
| title_sort | effects of alkalinity and salinity at low and high light intensity on hydrogen isotope fractionation of long chain alkenones produced by i emiliania huxleyi i |
| url | https://www.biogeosciences.net/14/5693/2017/bg-14-5693-2017.pdf |
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