Ice melting can change DMSP production and photosynthetic activity of the haptophyte Phaeocystis antarctica
Phaeocystis antarctica is an important primary producer in the Southern Ocean and plays roles in sulfur cycles through intracellular production of dimethylsulfoniopropionate (DMSP ), a principal precursor of dimethyl sulfide (DMS ). Haptophytes, including P. antarctica, are known to produce more DMS...
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2020
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ftunivtasmania:oai:eprints.utas.edu.au:34152 2023-05-15T13:31:54+02:00 Ice melting can change DMSP production and photosynthetic activity of the haptophyte Phaeocystis antarctica Kameyama, S Otomaru, M McMinn, A Suzuki, K 2020 https://eprints.utas.edu.au/34152/ unknown Blackwell Publishing Inc Kameyama, S, Otomaru, M, McMinn, A orcid:0000-0002-2133-3854 and Suzuki, K 2020 , 'Ice melting can change DMSP production and photosynthetic activity of the haptophyte Phaeocystis antarctica' , Journal of Phycology, vol. 56, no. 3 , pp. 761-774 , doi:10.1111/jpy.12985 <http://dx.doi.org/10.1111/jpy.12985>. DMSP DMS Antarctic sea ice Phaeocystis algae dimethylsulfoniopropionate Phaeocystis antarctica photosynthetic capacity Southern Ocean Article PeerReviewed 2020 ftunivtasmania https://doi.org/10.1111/jpy.12985 2021-09-20T22:18:49Z Phaeocystis antarctica is an important primary producer in the Southern Ocean and plays roles in sulfur cycles through intracellular production of dimethylsulfoniopropionate (DMSP ), a principal precursor of dimethyl sulfide (DMS ). Haptophytes, including P. antarctica, are known to produce more DMSP than other phytoplankton groups such as diatoms and green algae, suggesting their important contribution to DMS concentrations in the Southern Ocean. We assessed how sea ice formation and melting affect photosynthesis and DMSP accumulation in P. antarctica both in seawater and in sea ice. Incubations were undertaken in an ice tank, which simulated sea ice formation and melting dynamics. The maximum quantum yield of photochemistry (F v/F m) in photosystem II , as estimated from pulse‐amplitude‐modulated (PAM ) fluorometry, was generally higher under low‐light conditions than high‐light conditions. Values of F v/F m, the relative maximum electron rate (rETR max), and photosynthetic efficiency (α) were lower in sea ice than in seawater, implying reduced photosynthetic function inside the sea ice. The reduction in photosynthetic function was probably due to the hypersaline environment in the brine channels. Total DMSP (DMSP t) concentration normalized by chlorophyll‐a concentration was significantly higher in the sea ice than in the other environments, suggesting high accumulation of DMSP , probably due to its osmotic properties. F v/F m, specific growth rate, and DMSP t concentrations decreased with decreasing salinity with the lowest values found at a salinity of 22, that is, the lowest salinity tested. These results suggest that sea ice melting is responsible for a reduction in growth rate and DMSP production of P. antarctica . Article in Journal/Newspaper Antarc* Antarctic Antarctica Antarctica Journal Sea ice Southern Ocean University of Tasmania: UTas ePrints Antarctic Southern Ocean Journal of Phycology 56 3 761 774 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
unknown |
topic |
DMSP DMS Antarctic sea ice Phaeocystis algae dimethylsulfoniopropionate Phaeocystis antarctica photosynthetic capacity Southern Ocean |
spellingShingle |
DMSP DMS Antarctic sea ice Phaeocystis algae dimethylsulfoniopropionate Phaeocystis antarctica photosynthetic capacity Southern Ocean Kameyama, S Otomaru, M McMinn, A Suzuki, K Ice melting can change DMSP production and photosynthetic activity of the haptophyte Phaeocystis antarctica |
topic_facet |
DMSP DMS Antarctic sea ice Phaeocystis algae dimethylsulfoniopropionate Phaeocystis antarctica photosynthetic capacity Southern Ocean |
description |
Phaeocystis antarctica is an important primary producer in the Southern Ocean and plays roles in sulfur cycles through intracellular production of dimethylsulfoniopropionate (DMSP ), a principal precursor of dimethyl sulfide (DMS ). Haptophytes, including P. antarctica, are known to produce more DMSP than other phytoplankton groups such as diatoms and green algae, suggesting their important contribution to DMS concentrations in the Southern Ocean. We assessed how sea ice formation and melting affect photosynthesis and DMSP accumulation in P. antarctica both in seawater and in sea ice. Incubations were undertaken in an ice tank, which simulated sea ice formation and melting dynamics. The maximum quantum yield of photochemistry (F v/F m) in photosystem II , as estimated from pulse‐amplitude‐modulated (PAM ) fluorometry, was generally higher under low‐light conditions than high‐light conditions. Values of F v/F m, the relative maximum electron rate (rETR max), and photosynthetic efficiency (α) were lower in sea ice than in seawater, implying reduced photosynthetic function inside the sea ice. The reduction in photosynthetic function was probably due to the hypersaline environment in the brine channels. Total DMSP (DMSP t) concentration normalized by chlorophyll‐a concentration was significantly higher in the sea ice than in the other environments, suggesting high accumulation of DMSP , probably due to its osmotic properties. F v/F m, specific growth rate, and DMSP t concentrations decreased with decreasing salinity with the lowest values found at a salinity of 22, that is, the lowest salinity tested. These results suggest that sea ice melting is responsible for a reduction in growth rate and DMSP production of P. antarctica . |
format |
Article in Journal/Newspaper |
author |
Kameyama, S Otomaru, M McMinn, A Suzuki, K |
author_facet |
Kameyama, S Otomaru, M McMinn, A Suzuki, K |
author_sort |
Kameyama, S |
title |
Ice melting can change DMSP production and photosynthetic activity of the haptophyte Phaeocystis antarctica |
title_short |
Ice melting can change DMSP production and photosynthetic activity of the haptophyte Phaeocystis antarctica |
title_full |
Ice melting can change DMSP production and photosynthetic activity of the haptophyte Phaeocystis antarctica |
title_fullStr |
Ice melting can change DMSP production and photosynthetic activity of the haptophyte Phaeocystis antarctica |
title_full_unstemmed |
Ice melting can change DMSP production and photosynthetic activity of the haptophyte Phaeocystis antarctica |
title_sort |
ice melting can change dmsp production and photosynthetic activity of the haptophyte phaeocystis antarctica |
publisher |
Blackwell Publishing Inc |
publishDate |
2020 |
url |
https://eprints.utas.edu.au/34152/ |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Antarctica Antarctica Journal Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Antarctica Journal Sea ice Southern Ocean |
op_relation |
Kameyama, S, Otomaru, M, McMinn, A orcid:0000-0002-2133-3854 and Suzuki, K 2020 , 'Ice melting can change DMSP production and photosynthetic activity of the haptophyte Phaeocystis antarctica' , Journal of Phycology, vol. 56, no. 3 , pp. 761-774 , doi:10.1111/jpy.12985 <http://dx.doi.org/10.1111/jpy.12985>. |
op_doi |
https://doi.org/10.1111/jpy.12985 |
container_title |
Journal of Phycology |
container_volume |
56 |
container_issue |
3 |
container_start_page |
761 |
op_container_end_page |
774 |
_version_ |
1766022159965093888 |