Impact of ocean acidification on Arctic phytoplankton blooms and dimethyl sulfide concentration under simulated ice-free and under-ice conditions
In an experimental assessment of the potential impact of Arctic Ocean acidification on seasonal phytoplankton blooms and associated dimethyl sulfide (DMS) dynamics, we incubated water from Baffin Bay under conditions representing an acidified Arctic Ocean. Using two light regimes simulating under-ic...
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Online Access: | https://doi.org/10.5194/bg-14-2407-2017 https://doaj.org/article/26fde86df48f4dbb89de0b1f98e29f1a |
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ftdoajarticles:oai:doaj.org/article:26fde86df48f4dbb89de0b1f98e29f1a 2023-05-15T14:51:53+02:00 Impact of ocean acidification on Arctic phytoplankton blooms and dimethyl sulfide concentration under simulated ice-free and under-ice conditions R. Hussherr M. Levasseur M. Lizotte J.-É. Tremblay J. Mol H. Thomas M. Gosselin M. Starr L. A. Miller T. Jarniková N. Schuback A. Mucci 2017-05-01T00:00:00Z https://doi.org/10.5194/bg-14-2407-2017 https://doaj.org/article/26fde86df48f4dbb89de0b1f98e29f1a EN eng Copernicus Publications http://www.biogeosciences.net/14/2407/2017/bg-14-2407-2017.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-14-2407-2017 https://doaj.org/article/26fde86df48f4dbb89de0b1f98e29f1a Biogeosciences, Vol 14, Iss 9, Pp 2407-2427 (2017) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2017 ftdoajarticles https://doi.org/10.5194/bg-14-2407-2017 2022-12-31T16:28:22Z In an experimental assessment of the potential impact of Arctic Ocean acidification on seasonal phytoplankton blooms and associated dimethyl sulfide (DMS) dynamics, we incubated water from Baffin Bay under conditions representing an acidified Arctic Ocean. Using two light regimes simulating under-ice or subsurface chlorophyll maxima (low light; low PAR and no UVB) and ice-free (high light; high PAR + UVA + UVB) conditions, water collected at 38 m was exposed over 9 days to 6 levels of decreasing pH from 8.1 to 7.2. A phytoplankton bloom dominated by the centric diatoms Chaetoceros spp. reaching up to 7.5 µg chlorophyll a L −1 took place in all experimental bags. Total dimethylsulfoniopropionate (DMSP T ) and DMS concentrations reached 155 and 19 nmol L −1 , respectively. The sharp increase in DMSP T and DMS concentrations coincided with the exhaustion of NO 3 − in most microcosms, suggesting that nutrient stress stimulated DMS(P) synthesis by the diatom community. Under both light regimes, chlorophyll a and DMS concentrations decreased linearly with increasing proton concentration at all pH levels tested. Concentrations of DMSP T also decreased but only under high light and over a smaller pH range (from 8.1 to 7.6). In contrast to nano-phytoplankton (2–20 µm), pico-phytoplankton ( ≤ 2 µm) was stimulated by the decreasing pH. We furthermore observed no significant difference between the two light regimes tested in term of chlorophyll a , phytoplankton abundance and taxonomy, and DMSP and DMS net concentrations. These results show that ocean acidification could significantly decrease the algal biomass and inhibit DMS production during the seasonal phytoplankton bloom in the Arctic, with possible consequences for the regional climate. Article in Journal/Newspaper Arctic Arctic Ocean Arctic Ocean Acidification Baffin Bay Baffin Bay Baffin Ocean acidification Phytoplankton Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Baffin Bay Biogeosciences 14 9 2407 2427 |
institution |
Open Polar |
collection |
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 R. Hussherr M. Levasseur M. Lizotte J.-É. Tremblay J. Mol H. Thomas M. Gosselin M. Starr L. A. Miller T. Jarniková N. Schuback A. Mucci Impact of ocean acidification on Arctic phytoplankton blooms and dimethyl sulfide concentration under simulated ice-free and under-ice conditions |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
In an experimental assessment of the potential impact of Arctic Ocean acidification on seasonal phytoplankton blooms and associated dimethyl sulfide (DMS) dynamics, we incubated water from Baffin Bay under conditions representing an acidified Arctic Ocean. Using two light regimes simulating under-ice or subsurface chlorophyll maxima (low light; low PAR and no UVB) and ice-free (high light; high PAR + UVA + UVB) conditions, water collected at 38 m was exposed over 9 days to 6 levels of decreasing pH from 8.1 to 7.2. A phytoplankton bloom dominated by the centric diatoms Chaetoceros spp. reaching up to 7.5 µg chlorophyll a L −1 took place in all experimental bags. Total dimethylsulfoniopropionate (DMSP T ) and DMS concentrations reached 155 and 19 nmol L −1 , respectively. The sharp increase in DMSP T and DMS concentrations coincided with the exhaustion of NO 3 − in most microcosms, suggesting that nutrient stress stimulated DMS(P) synthesis by the diatom community. Under both light regimes, chlorophyll a and DMS concentrations decreased linearly with increasing proton concentration at all pH levels tested. Concentrations of DMSP T also decreased but only under high light and over a smaller pH range (from 8.1 to 7.6). In contrast to nano-phytoplankton (2–20 µm), pico-phytoplankton ( ≤ 2 µm) was stimulated by the decreasing pH. We furthermore observed no significant difference between the two light regimes tested in term of chlorophyll a , phytoplankton abundance and taxonomy, and DMSP and DMS net concentrations. These results show that ocean acidification could significantly decrease the algal biomass and inhibit DMS production during the seasonal phytoplankton bloom in the Arctic, with possible consequences for the regional climate. |
format |
Article in Journal/Newspaper |
author |
R. Hussherr M. Levasseur M. Lizotte J.-É. Tremblay J. Mol H. Thomas M. Gosselin M. Starr L. A. Miller T. Jarniková N. Schuback A. Mucci |
author_facet |
R. Hussherr M. Levasseur M. Lizotte J.-É. Tremblay J. Mol H. Thomas M. Gosselin M. Starr L. A. Miller T. Jarniková N. Schuback A. Mucci |
author_sort |
R. Hussherr |
title |
Impact of ocean acidification on Arctic phytoplankton blooms and dimethyl sulfide concentration under simulated ice-free and under-ice conditions |
title_short |
Impact of ocean acidification on Arctic phytoplankton blooms and dimethyl sulfide concentration under simulated ice-free and under-ice conditions |
title_full |
Impact of ocean acidification on Arctic phytoplankton blooms and dimethyl sulfide concentration under simulated ice-free and under-ice conditions |
title_fullStr |
Impact of ocean acidification on Arctic phytoplankton blooms and dimethyl sulfide concentration under simulated ice-free and under-ice conditions |
title_full_unstemmed |
Impact of ocean acidification on Arctic phytoplankton blooms and dimethyl sulfide concentration under simulated ice-free and under-ice conditions |
title_sort |
impact of ocean acidification on arctic phytoplankton blooms and dimethyl sulfide concentration under simulated ice-free and under-ice conditions |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/bg-14-2407-2017 https://doaj.org/article/26fde86df48f4dbb89de0b1f98e29f1a |
geographic |
Arctic Arctic Ocean Baffin Bay |
geographic_facet |
Arctic Arctic Ocean Baffin Bay |
genre |
Arctic Arctic Ocean Arctic Ocean Acidification Baffin Bay Baffin Bay Baffin Ocean acidification Phytoplankton |
genre_facet |
Arctic Arctic Ocean Arctic Ocean Acidification Baffin Bay Baffin Bay Baffin Ocean acidification Phytoplankton |
op_source |
Biogeosciences, Vol 14, Iss 9, Pp 2407-2427 (2017) |
op_relation |
http://www.biogeosciences.net/14/2407/2017/bg-14-2407-2017.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-14-2407-2017 https://doaj.org/article/26fde86df48f4dbb89de0b1f98e29f1a |
op_doi |
https://doi.org/10.5194/bg-14-2407-2017 |
container_title |
Biogeosciences |
container_volume |
14 |
container_issue |
9 |
container_start_page |
2407 |
op_container_end_page |
2427 |
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1766323030478290944 |