Production of dissolved organic carbon by Arctic plankton communities: Responses to elevated carbon dioxide and the availability of light and nutrients
The extracellular release of dissolved organic carbon (DOC) by phytoplankton is a potentially important source of labile organic carbon for bacterioplankton in pelagic ecosystems. In the context of increasing seawater partial pressure of CO2 (pCO2), via the oceanic absorption of elevated atmospheric...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
---|---|
Main Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2016
|
Subjects: | |
Online Access: | https://eprints.soton.ac.uk/388148/ |
id |
ftsouthampton:oai:eprints.soton.ac.uk:388148 |
---|---|
record_format |
openpolar |
spelling |
ftsouthampton:oai:eprints.soton.ac.uk:388148 2023-08-27T04:06:46+02:00 Production of dissolved organic carbon by Arctic plankton communities: Responses to elevated carbon dioxide and the availability of light and nutrients Poulton, Alex J. Daniels, Chris J. Esposito, Mario Humphreys, Matthew P. Mitchell, Elaine Ribas-Ribas, Mariana Russell, Benjamin C. Stinchcombe, Mark C. Tynan, Eithne Richier, Sophie 2016-05 https://eprints.soton.ac.uk/388148/ English eng Poulton, Alex J., Daniels, Chris J., Esposito, Mario, Humphreys, Matthew P., Mitchell, Elaine, Ribas-Ribas, Mariana, Russell, Benjamin C., Stinchcombe, Mark C., Tynan, Eithne and Richier, Sophie (2016) Production of dissolved organic carbon by Arctic plankton communities: Responses to elevated carbon dioxide and the availability of light and nutrients. Deep Sea Research Part II: Topical Studies in Oceanography, 127, 60-74. (doi:10.1016/j.dsr2.2016.01.002 <http://dx.doi.org/10.1016/j.dsr2.2016.01.002>). Article PeerReviewed 2016 ftsouthampton https://doi.org/10.1016/j.dsr2.2016.01.002 2023-08-03T22:21:33Z The extracellular release of dissolved organic carbon (DOC) by phytoplankton is a potentially important source of labile organic carbon for bacterioplankton in pelagic ecosystems. In the context of increasing seawater partial pressure of CO2 (pCO2), via the oceanic absorption of elevated atmospheric CO2 (ocean acidification), several previous studies have reported increases to the relative amount of carbon fixed into particulates, via primary production (PP), and dissolved phases (DOC). During the summer of 2012 we measured DOC production by phytoplankton communities in the Nordic seas of the Arctic Ocean (Greenland, Norwegian and Barents Sea) from both in situ sampling and during three bioassay experiments where pCO2 levels (targets ~550 µatm, ~750 µatm, ~1000 µatm) were elevated relative to ambient conditions. Measurements of DOC production and PP came from 24 h incubations and therefore represent net DOC production rates, where an unknown portion of the DOC released has potentially been utilised by heterotrophic organisms. Production of DOC (net pDOC) by in situ communities varied from 0.09 to 0.64 mmol C m?3 d?1 (average 0.25 mmol C m?3 d?1), with comparative rates in two of the experimental bioassays (0.04–1.23 mmol C m?3 d?1) and increasing dramatically in the third (up to 5.88 mmol C m?3 d?1). When expressed as a fraction of total carbon fixation (i.e., PP plus pDOC), percentage extracellular release (PER) was 14% on average (range 2–46%) for in situ measurements, with PER in the three bioassays having a very similar range (2–50%). A marked increase in pDOC (and PER) was only observed in one of the bioassays where nutrient levels (nitrate, silicic acid) dropped dramatically relative to starting (ambient) concentrations; no pCO2 treatment effect on pDOC (or PER) was evident across the three experiments. Examination of in situ net pDOC (and PER) found significant correlations with decreasing silicic acid and increasing euphotic zone depth, indicating that nutrient and light availability were strong drivers ... Article in Journal/Newspaper Arctic Arctic Arctic Ocean Barents Sea Greenland Nordic Seas Ocean acidification Phytoplankton University of Southampton: e-Prints Soton Arctic Arctic Ocean Barents Sea Greenland Deep Sea Research Part II: Topical Studies in Oceanography 127 60 74 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
The extracellular release of dissolved organic carbon (DOC) by phytoplankton is a potentially important source of labile organic carbon for bacterioplankton in pelagic ecosystems. In the context of increasing seawater partial pressure of CO2 (pCO2), via the oceanic absorption of elevated atmospheric CO2 (ocean acidification), several previous studies have reported increases to the relative amount of carbon fixed into particulates, via primary production (PP), and dissolved phases (DOC). During the summer of 2012 we measured DOC production by phytoplankton communities in the Nordic seas of the Arctic Ocean (Greenland, Norwegian and Barents Sea) from both in situ sampling and during three bioassay experiments where pCO2 levels (targets ~550 µatm, ~750 µatm, ~1000 µatm) were elevated relative to ambient conditions. Measurements of DOC production and PP came from 24 h incubations and therefore represent net DOC production rates, where an unknown portion of the DOC released has potentially been utilised by heterotrophic organisms. Production of DOC (net pDOC) by in situ communities varied from 0.09 to 0.64 mmol C m?3 d?1 (average 0.25 mmol C m?3 d?1), with comparative rates in two of the experimental bioassays (0.04–1.23 mmol C m?3 d?1) and increasing dramatically in the third (up to 5.88 mmol C m?3 d?1). When expressed as a fraction of total carbon fixation (i.e., PP plus pDOC), percentage extracellular release (PER) was 14% on average (range 2–46%) for in situ measurements, with PER in the three bioassays having a very similar range (2–50%). A marked increase in pDOC (and PER) was only observed in one of the bioassays where nutrient levels (nitrate, silicic acid) dropped dramatically relative to starting (ambient) concentrations; no pCO2 treatment effect on pDOC (or PER) was evident across the three experiments. Examination of in situ net pDOC (and PER) found significant correlations with decreasing silicic acid and increasing euphotic zone depth, indicating that nutrient and light availability were strong drivers ... |
format |
Article in Journal/Newspaper |
author |
Poulton, Alex J. Daniels, Chris J. Esposito, Mario Humphreys, Matthew P. Mitchell, Elaine Ribas-Ribas, Mariana Russell, Benjamin C. Stinchcombe, Mark C. Tynan, Eithne Richier, Sophie |
spellingShingle |
Poulton, Alex J. Daniels, Chris J. Esposito, Mario Humphreys, Matthew P. Mitchell, Elaine Ribas-Ribas, Mariana Russell, Benjamin C. Stinchcombe, Mark C. Tynan, Eithne Richier, Sophie Production of dissolved organic carbon by Arctic plankton communities: Responses to elevated carbon dioxide and the availability of light and nutrients |
author_facet |
Poulton, Alex J. Daniels, Chris J. Esposito, Mario Humphreys, Matthew P. Mitchell, Elaine Ribas-Ribas, Mariana Russell, Benjamin C. Stinchcombe, Mark C. Tynan, Eithne Richier, Sophie |
author_sort |
Poulton, Alex J. |
title |
Production of dissolved organic carbon by Arctic plankton communities: Responses to elevated carbon dioxide and the availability of light and nutrients |
title_short |
Production of dissolved organic carbon by Arctic plankton communities: Responses to elevated carbon dioxide and the availability of light and nutrients |
title_full |
Production of dissolved organic carbon by Arctic plankton communities: Responses to elevated carbon dioxide and the availability of light and nutrients |
title_fullStr |
Production of dissolved organic carbon by Arctic plankton communities: Responses to elevated carbon dioxide and the availability of light and nutrients |
title_full_unstemmed |
Production of dissolved organic carbon by Arctic plankton communities: Responses to elevated carbon dioxide and the availability of light and nutrients |
title_sort |
production of dissolved organic carbon by arctic plankton communities: responses to elevated carbon dioxide and the availability of light and nutrients |
publishDate |
2016 |
url |
https://eprints.soton.ac.uk/388148/ |
geographic |
Arctic Arctic Ocean Barents Sea Greenland |
geographic_facet |
Arctic Arctic Ocean Barents Sea Greenland |
genre |
Arctic Arctic Arctic Ocean Barents Sea Greenland Nordic Seas Ocean acidification Phytoplankton |
genre_facet |
Arctic Arctic Arctic Ocean Barents Sea Greenland Nordic Seas Ocean acidification Phytoplankton |
op_relation |
Poulton, Alex J., Daniels, Chris J., Esposito, Mario, Humphreys, Matthew P., Mitchell, Elaine, Ribas-Ribas, Mariana, Russell, Benjamin C., Stinchcombe, Mark C., Tynan, Eithne and Richier, Sophie (2016) Production of dissolved organic carbon by Arctic plankton communities: Responses to elevated carbon dioxide and the availability of light and nutrients. Deep Sea Research Part II: Topical Studies in Oceanography, 127, 60-74. (doi:10.1016/j.dsr2.2016.01.002 <http://dx.doi.org/10.1016/j.dsr2.2016.01.002>). |
op_doi |
https://doi.org/10.1016/j.dsr2.2016.01.002 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
127 |
container_start_page |
60 |
op_container_end_page |
74 |
_version_ |
1775347554164146176 |