Picoeukaryote distribution in relation to nitrate uptake in the oceanic nitracline
We investigated the relationship between picoeukaryote phytoplankton (<2 ?m) and the deep layer of new production (NO3- uptake) in the nitracline of the eastern subtropical North Atlantic Ocean. Indices of NO3- uptake kinetics obtained within the lower 15% of the euphotic zone demonstrate that su...
Published in: | Aquatic Microbial Ecology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2014
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Online Access: | https://eprints.soton.ac.uk/365530/ https://eprints.soton.ac.uk/365530/1/a072p195.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:365530 2023-07-30T04:05:25+02:00 Picoeukaryote distribution in relation to nitrate uptake in the oceanic nitracline Painter, S.C. Patey, M.D. Tarran, G.A. Torres-Valdés, S. 2014-06 text https://eprints.soton.ac.uk/365530/ https://eprints.soton.ac.uk/365530/1/a072p195.pdf en English eng https://eprints.soton.ac.uk/365530/1/a072p195.pdf Painter, S.C., Patey, M.D., Tarran, G.A. and Torres-Valdés, S. (2014) Picoeukaryote distribution in relation to nitrate uptake in the oceanic nitracline. Aquatic Microbial Ecology, 72 (3), 195-213. (doi:10.3354/ame01695 <http://dx.doi.org/10.3354/ame01695>). other Article PeerReviewed 2014 ftsouthampton https://doi.org/10.3354/ame01695 2023-07-09T21:53:16Z We investigated the relationship between picoeukaryote phytoplankton (<2 ?m) and the deep layer of new production (NO3- uptake) in the nitracline of the eastern subtropical North Atlantic Ocean. Indices of NO3- uptake kinetics obtained within the lower 15% of the euphotic zone demonstrate that subsurface NO3- uptake maxima are coincident with localised peaks in maximum uptake rates (Vmax) and, crucially, with maximum picoeukaryote abundance. The mean rate of NO3- utilization at the nitracline is typically 10-fold higher than in surface waters despite much lower in-situ irradiances. These observations confirm a high affinity for NO3-, most likely by the resident picoeukaryote community, and we conservatively estimate mean cellular uptake rates of between 0.27 and 1.96 fmol NO3- cell-1 h-1. Greater scrutiny of the taxonomic composition of the picoeukaryote group is required to further understand this deep layer of new production and its importance for nitrogen cycling and export production given longstanding assumptions that picoplankton do not contribute directly to export fluxes. Article in Journal/Newspaper North Atlantic University of Southampton: e-Prints Soton Aquatic Microbial Ecology 72 3 195 213 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
We investigated the relationship between picoeukaryote phytoplankton (<2 ?m) and the deep layer of new production (NO3- uptake) in the nitracline of the eastern subtropical North Atlantic Ocean. Indices of NO3- uptake kinetics obtained within the lower 15% of the euphotic zone demonstrate that subsurface NO3- uptake maxima are coincident with localised peaks in maximum uptake rates (Vmax) and, crucially, with maximum picoeukaryote abundance. The mean rate of NO3- utilization at the nitracline is typically 10-fold higher than in surface waters despite much lower in-situ irradiances. These observations confirm a high affinity for NO3-, most likely by the resident picoeukaryote community, and we conservatively estimate mean cellular uptake rates of between 0.27 and 1.96 fmol NO3- cell-1 h-1. Greater scrutiny of the taxonomic composition of the picoeukaryote group is required to further understand this deep layer of new production and its importance for nitrogen cycling and export production given longstanding assumptions that picoplankton do not contribute directly to export fluxes. |
format |
Article in Journal/Newspaper |
author |
Painter, S.C. Patey, M.D. Tarran, G.A. Torres-Valdés, S. |
spellingShingle |
Painter, S.C. Patey, M.D. Tarran, G.A. Torres-Valdés, S. Picoeukaryote distribution in relation to nitrate uptake in the oceanic nitracline |
author_facet |
Painter, S.C. Patey, M.D. Tarran, G.A. Torres-Valdés, S. |
author_sort |
Painter, S.C. |
title |
Picoeukaryote distribution in relation to nitrate uptake in the oceanic nitracline |
title_short |
Picoeukaryote distribution in relation to nitrate uptake in the oceanic nitracline |
title_full |
Picoeukaryote distribution in relation to nitrate uptake in the oceanic nitracline |
title_fullStr |
Picoeukaryote distribution in relation to nitrate uptake in the oceanic nitracline |
title_full_unstemmed |
Picoeukaryote distribution in relation to nitrate uptake in the oceanic nitracline |
title_sort |
picoeukaryote distribution in relation to nitrate uptake in the oceanic nitracline |
publishDate |
2014 |
url |
https://eprints.soton.ac.uk/365530/ https://eprints.soton.ac.uk/365530/1/a072p195.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://eprints.soton.ac.uk/365530/1/a072p195.pdf Painter, S.C., Patey, M.D., Tarran, G.A. and Torres-Valdés, S. (2014) Picoeukaryote distribution in relation to nitrate uptake in the oceanic nitracline. Aquatic Microbial Ecology, 72 (3), 195-213. (doi:10.3354/ame01695 <http://dx.doi.org/10.3354/ame01695>). |
op_rights |
other |
op_doi |
https://doi.org/10.3354/ame01695 |
container_title |
Aquatic Microbial Ecology |
container_volume |
72 |
container_issue |
3 |
container_start_page |
195 |
op_container_end_page |
213 |
_version_ |
1772817310302601216 |