On the Relationship Between Hydrogen Saturation in the Tropical Atlantic Ocean and Nitrogen Fixation by the Symbiotic Diazotroph UCYN-A
Dissolved hydrogen measurements were made at high resolution in surface waters along a tropical north Atlantic transect between Guadeloupe and Cape Verde in 2015 (Meteor 116). Parallel water samples acquired to assess the relative abundance of the nifH gene from several types of diazotrophs, indicat...
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ftulancaster:oai:eprints.lancs.ac.uk:147527 2023-08-27T04:10:58+02:00 On the Relationship Between Hydrogen Saturation in the Tropical Atlantic Ocean and Nitrogen Fixation by the Symbiotic Diazotroph UCYN-A Moore, R.M. Grefe, I. Zorz, J. Shan, S. Thompson, K. Ratten, J. LaRoche, J. 2018-04-01 text https://eprints.lancs.ac.uk/id/eprint/147527/ https://eprints.lancs.ac.uk/id/eprint/147527/1/809750_2_merged_1519411905.pdf https://doi.org/10.1002/2017JC013047 en eng https://eprints.lancs.ac.uk/id/eprint/147527/1/809750_2_merged_1519411905.pdf Moore, R.M. and Grefe, I. and Zorz, J. and Shan, S. and Thompson, K. and Ratten, J. and LaRoche, J. (2018) On the Relationship Between Hydrogen Saturation in the Tropical Atlantic Ocean and Nitrogen Fixation by the Symbiotic Diazotroph UCYN-A. Journal of Geophysical Research: Oceans, 123 (4). pp. 2353-2362. ISSN 8755-8556 creative_commons_attribution_noncommercial_noderivatives_4_0_international_license Journal Article PeerReviewed 2018 ftulancaster https://doi.org/10.1002/2017JC013047 2023-08-03T22:38:44Z Dissolved hydrogen measurements were made at high resolution in surface waters along a tropical north Atlantic transect between Guadeloupe and Cape Verde in 2015 (Meteor 116). Parallel water samples acquired to assess the relative abundance of the nifH gene from several types of diazotrophs, indicated that Trichodesmium and UCYN‐A were dominant in this region. We show that a high degree of correlation exists between the hydrogen saturations and UCYN‐A nifH abundance, and a weak correlation with Trichodesmium . The findings suggest that nitrogen fixation by UCYN‐A is a major contributor to hydrogen supersaturations in this region of the ocean. The ratio of hydrogen released to nitrogen fixed has not been determined for this symbiont, but the indications are that it may be high in comparison with the small number of diazotrophs for which the ratio has been measured in laboratory cultures. We speculate that this would be consistent with the diazotroph being an exosymbiont on its haptophyte host. Our high resolution measurements of hydrogen concentrations are capable of illustrating the time and space scales of inferred activity of diazotrophs in near real‐time in a way that cannot be achieved by biological sampling and rate measurements requiring incubations with 15N2. Direct measurement of high resolution spatial variability would be relatively challenging through collection and analysis of biological samples by qPCR, and extremely challenging by 15N‐uptake techniques, neither of which methods yields real‐time data. Nonetheless, determination of fixation rates still firmly depends on the established procedure of incubations in the presence of 15N2. Article in Journal/Newspaper North Atlantic Lancaster University: Lancaster Eprints Journal of Geophysical Research: Oceans 123 4 2353 2362 |
institution |
Open Polar |
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Lancaster University: Lancaster Eprints |
op_collection_id |
ftulancaster |
language |
English |
description |
Dissolved hydrogen measurements were made at high resolution in surface waters along a tropical north Atlantic transect between Guadeloupe and Cape Verde in 2015 (Meteor 116). Parallel water samples acquired to assess the relative abundance of the nifH gene from several types of diazotrophs, indicated that Trichodesmium and UCYN‐A were dominant in this region. We show that a high degree of correlation exists between the hydrogen saturations and UCYN‐A nifH abundance, and a weak correlation with Trichodesmium . The findings suggest that nitrogen fixation by UCYN‐A is a major contributor to hydrogen supersaturations in this region of the ocean. The ratio of hydrogen released to nitrogen fixed has not been determined for this symbiont, but the indications are that it may be high in comparison with the small number of diazotrophs for which the ratio has been measured in laboratory cultures. We speculate that this would be consistent with the diazotroph being an exosymbiont on its haptophyte host. Our high resolution measurements of hydrogen concentrations are capable of illustrating the time and space scales of inferred activity of diazotrophs in near real‐time in a way that cannot be achieved by biological sampling and rate measurements requiring incubations with 15N2. Direct measurement of high resolution spatial variability would be relatively challenging through collection and analysis of biological samples by qPCR, and extremely challenging by 15N‐uptake techniques, neither of which methods yields real‐time data. Nonetheless, determination of fixation rates still firmly depends on the established procedure of incubations in the presence of 15N2. |
format |
Article in Journal/Newspaper |
author |
Moore, R.M. Grefe, I. Zorz, J. Shan, S. Thompson, K. Ratten, J. LaRoche, J. |
spellingShingle |
Moore, R.M. Grefe, I. Zorz, J. Shan, S. Thompson, K. Ratten, J. LaRoche, J. On the Relationship Between Hydrogen Saturation in the Tropical Atlantic Ocean and Nitrogen Fixation by the Symbiotic Diazotroph UCYN-A |
author_facet |
Moore, R.M. Grefe, I. Zorz, J. Shan, S. Thompson, K. Ratten, J. LaRoche, J. |
author_sort |
Moore, R.M. |
title |
On the Relationship Between Hydrogen Saturation in the Tropical Atlantic Ocean and Nitrogen Fixation by the Symbiotic Diazotroph UCYN-A |
title_short |
On the Relationship Between Hydrogen Saturation in the Tropical Atlantic Ocean and Nitrogen Fixation by the Symbiotic Diazotroph UCYN-A |
title_full |
On the Relationship Between Hydrogen Saturation in the Tropical Atlantic Ocean and Nitrogen Fixation by the Symbiotic Diazotroph UCYN-A |
title_fullStr |
On the Relationship Between Hydrogen Saturation in the Tropical Atlantic Ocean and Nitrogen Fixation by the Symbiotic Diazotroph UCYN-A |
title_full_unstemmed |
On the Relationship Between Hydrogen Saturation in the Tropical Atlantic Ocean and Nitrogen Fixation by the Symbiotic Diazotroph UCYN-A |
title_sort |
on the relationship between hydrogen saturation in the tropical atlantic ocean and nitrogen fixation by the symbiotic diazotroph ucyn-a |
publishDate |
2018 |
url |
https://eprints.lancs.ac.uk/id/eprint/147527/ https://eprints.lancs.ac.uk/id/eprint/147527/1/809750_2_merged_1519411905.pdf https://doi.org/10.1002/2017JC013047 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://eprints.lancs.ac.uk/id/eprint/147527/1/809750_2_merged_1519411905.pdf Moore, R.M. and Grefe, I. and Zorz, J. and Shan, S. and Thompson, K. and Ratten, J. and LaRoche, J. (2018) On the Relationship Between Hydrogen Saturation in the Tropical Atlantic Ocean and Nitrogen Fixation by the Symbiotic Diazotroph UCYN-A. Journal of Geophysical Research: Oceans, 123 (4). pp. 2353-2362. ISSN 8755-8556 |
op_rights |
creative_commons_attribution_noncommercial_noderivatives_4_0_international_license |
op_doi |
https://doi.org/10.1002/2017JC013047 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
4 |
container_start_page |
2353 |
op_container_end_page |
2362 |
_version_ |
1775353393972248576 |