Impact of ocean acidification on phytoplankton assemblage, growth, and DMS production following Fe-dust additions in the NE Pacific high-nutrient, low-chlorophyll waters
Ocean acidification (OA) is likely to have an effect on the fertilizing potential of desert dust in high-nutrient, low-chlorophyll oceanic regions, either by modifying iron (Fe) speciation and bioavailability or by altering phytoplankton Fe requirements and acquisition. To address this issue, short...
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ftdoajarticles:oai:doaj.org/article:94da02dedcab4d44a79e310d6082aa2a 2023-05-15T17:50:57+02:00 Impact of ocean acidification on phytoplankton assemblage, growth, and DMS production following Fe-dust additions in the NE Pacific high-nutrient, low-chlorophyll waters J. Mélançon M. Levasseur M. Lizotte M. Scarratt J.-É. Tremblay P. Tortell G.-P. Yang G.-Y. Shi H. Gao D. Semeniuk M. Robert M. Arychuk K. Johnson N. Sutherland M. Davelaar N. Nemcek A. Peña W. Richardson 2016-03-01T00:00:00Z https://doi.org/10.5194/bg-13-1677-2016 https://doaj.org/article/94da02dedcab4d44a79e310d6082aa2a EN eng Copernicus Publications http://www.biogeosciences.net/13/1677/2016/bg-13-1677-2016.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-13-1677-2016 https://doaj.org/article/94da02dedcab4d44a79e310d6082aa2a Biogeosciences, Vol 13, Iss 5, Pp 1677-1692 (2016) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2016 ftdoajarticles https://doi.org/10.5194/bg-13-1677-2016 2022-12-31T11:22:11Z Ocean acidification (OA) is likely to have an effect on the fertilizing potential of desert dust in high-nutrient, low-chlorophyll oceanic regions, either by modifying iron (Fe) speciation and bioavailability or by altering phytoplankton Fe requirements and acquisition. To address this issue, short incubations (4 days) of northeast subarctic Pacific waters enriched with either FeSO 4 or dust and set at pH 8.0 (in situ) and 7.8 were conducted in August 2010. We assessed the impact of a decrease in pH on dissolved Fe concentration, phytoplankton biomass, taxonomy and productivity, and the production of dimethylsulfide (DMS) and its algal precursor dimethylsulfoniopropionate (DMSP). Chlorophyll a (chl a ) remained unchanged in the controls and doubled in both the FeSO 4 -enriched and dust-enriched incubations, confirming the Fe-limited status of the plankton assemblage during the experiment. In the acidified treatments, a significant reduction (by 16–38 %) in the final concentration of chl a was measured compared to their nonacidified counterparts, and a 15 % reduction in particulate organic carbon (POC) concentration was measured in the dust-enriched acidified treatment compared to the dust-enriched nonacidified treatment. FeSO 4 and dust additions had a fertilizing effect mainly on diatoms and cyanobacteria as estimated from algal pigment signatures. Lowering the pH affected mostly the haptophytes, but pelagophyte concentrations were also reduced in some acidified treatments. Acidification did not significantly alter DMSP and DMS concentrations. These results show that dust deposition events in a low-pH iron-limited northeast subarctic Pacific are likely to stimulate phytoplankton growth to a lesser extent than in today's ocean during the few days following fertilization and point to a low initial sensitivity of the DMSP and DMS dynamics to OA. Article in Journal/Newspaper Ocean acidification Subarctic Directory of Open Access Journals: DOAJ Articles Pacific Biogeosciences 13 5 1677 1692 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 J. Mélançon M. Levasseur M. Lizotte M. Scarratt J.-É. Tremblay P. Tortell G.-P. Yang G.-Y. Shi H. Gao D. Semeniuk M. Robert M. Arychuk K. Johnson N. Sutherland M. Davelaar N. Nemcek A. Peña W. Richardson Impact of ocean acidification on phytoplankton assemblage, growth, and DMS production following Fe-dust additions in the NE Pacific high-nutrient, low-chlorophyll waters |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Ocean acidification (OA) is likely to have an effect on the fertilizing potential of desert dust in high-nutrient, low-chlorophyll oceanic regions, either by modifying iron (Fe) speciation and bioavailability or by altering phytoplankton Fe requirements and acquisition. To address this issue, short incubations (4 days) of northeast subarctic Pacific waters enriched with either FeSO 4 or dust and set at pH 8.0 (in situ) and 7.8 were conducted in August 2010. We assessed the impact of a decrease in pH on dissolved Fe concentration, phytoplankton biomass, taxonomy and productivity, and the production of dimethylsulfide (DMS) and its algal precursor dimethylsulfoniopropionate (DMSP). Chlorophyll a (chl a ) remained unchanged in the controls and doubled in both the FeSO 4 -enriched and dust-enriched incubations, confirming the Fe-limited status of the plankton assemblage during the experiment. In the acidified treatments, a significant reduction (by 16–38 %) in the final concentration of chl a was measured compared to their nonacidified counterparts, and a 15 % reduction in particulate organic carbon (POC) concentration was measured in the dust-enriched acidified treatment compared to the dust-enriched nonacidified treatment. FeSO 4 and dust additions had a fertilizing effect mainly on diatoms and cyanobacteria as estimated from algal pigment signatures. Lowering the pH affected mostly the haptophytes, but pelagophyte concentrations were also reduced in some acidified treatments. Acidification did not significantly alter DMSP and DMS concentrations. These results show that dust deposition events in a low-pH iron-limited northeast subarctic Pacific are likely to stimulate phytoplankton growth to a lesser extent than in today's ocean during the few days following fertilization and point to a low initial sensitivity of the DMSP and DMS dynamics to OA. |
format |
Article in Journal/Newspaper |
author |
J. Mélançon M. Levasseur M. Lizotte M. Scarratt J.-É. Tremblay P. Tortell G.-P. Yang G.-Y. Shi H. Gao D. Semeniuk M. Robert M. Arychuk K. Johnson N. Sutherland M. Davelaar N. Nemcek A. Peña W. Richardson |
author_facet |
J. Mélançon M. Levasseur M. Lizotte M. Scarratt J.-É. Tremblay P. Tortell G.-P. Yang G.-Y. Shi H. Gao D. Semeniuk M. Robert M. Arychuk K. Johnson N. Sutherland M. Davelaar N. Nemcek A. Peña W. Richardson |
author_sort |
J. Mélançon |
title |
Impact of ocean acidification on phytoplankton assemblage, growth, and DMS production following Fe-dust additions in the NE Pacific high-nutrient, low-chlorophyll waters |
title_short |
Impact of ocean acidification on phytoplankton assemblage, growth, and DMS production following Fe-dust additions in the NE Pacific high-nutrient, low-chlorophyll waters |
title_full |
Impact of ocean acidification on phytoplankton assemblage, growth, and DMS production following Fe-dust additions in the NE Pacific high-nutrient, low-chlorophyll waters |
title_fullStr |
Impact of ocean acidification on phytoplankton assemblage, growth, and DMS production following Fe-dust additions in the NE Pacific high-nutrient, low-chlorophyll waters |
title_full_unstemmed |
Impact of ocean acidification on phytoplankton assemblage, growth, and DMS production following Fe-dust additions in the NE Pacific high-nutrient, low-chlorophyll waters |
title_sort |
impact of ocean acidification on phytoplankton assemblage, growth, and dms production following fe-dust additions in the ne pacific high-nutrient, low-chlorophyll waters |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/bg-13-1677-2016 https://doaj.org/article/94da02dedcab4d44a79e310d6082aa2a |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ocean acidification Subarctic |
genre_facet |
Ocean acidification Subarctic |
op_source |
Biogeosciences, Vol 13, Iss 5, Pp 1677-1692 (2016) |
op_relation |
http://www.biogeosciences.net/13/1677/2016/bg-13-1677-2016.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-13-1677-2016 https://doaj.org/article/94da02dedcab4d44a79e310d6082aa2a |
op_doi |
https://doi.org/10.5194/bg-13-1677-2016 |
container_title |
Biogeosciences |
container_volume |
13 |
container_issue |
5 |
container_start_page |
1677 |
op_container_end_page |
1692 |
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