PHOTOPHYSIOLOGY IN TWO SOUTHERN OCEAN PHYTOPLANKTON TAXA: PHOTOSYNTHESIS OF PHAEOCYSTIS ANTARCTICA (PRYMNESIOPHYCEAE) AND FRAGILARIOPSIS CYLINDRUS (BACILLARIOPHYCEAE) UNDER SIMULATED MIXED‐LAYER IRRADIANCE 1

In the Ross Sea, the prymnesiophyte Phaeocystis antarctica G. Karst. dominates deeply mixed water columns, while diatoms dominate shallower mixed layers. Understanding what controls the dynamics of these two phytoplankton taxa is essential because they dominate virtually all coastal polar waters, ha...

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Published in:Journal of Phycology
Main Authors: Mills, Matthew M., Kropuenske, Lindsey R., van Dijken, Gert L., Alderkamp, Anne‐Carlijn, Berg, Gry Mine, Robinson, Dale H., Welschmeyer, Nicholas A., Arrigo, Kevin R.
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2010
Subjects:
Online Access:http://dx.doi.org/10.1111/j.1529-8817.2010.00923.x
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1529-8817.2010.00923.x
https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1529-8817.2010.00923.x
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spelling crwiley:10.1111/j.1529-8817.2010.00923.x 2024-06-23T07:47:57+00:00 PHOTOPHYSIOLOGY IN TWO SOUTHERN OCEAN PHYTOPLANKTON TAXA: PHOTOSYNTHESIS OF PHAEOCYSTIS ANTARCTICA (PRYMNESIOPHYCEAE) AND FRAGILARIOPSIS CYLINDRUS (BACILLARIOPHYCEAE) UNDER SIMULATED MIXED‐LAYER IRRADIANCE 1 Mills, Matthew M. Kropuenske, Lindsey R. van Dijken, Gert L. Alderkamp, Anne‐Carlijn Berg, Gry Mine Robinson, Dale H. Welschmeyer, Nicholas A. Arrigo, Kevin R. 2010 http://dx.doi.org/10.1111/j.1529-8817.2010.00923.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1529-8817.2010.00923.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1529-8817.2010.00923.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Phycology volume 46, issue 6, page 1114-1127 ISSN 0022-3646 1529-8817 journal-article 2010 crwiley https://doi.org/10.1111/j.1529-8817.2010.00923.x 2024-06-13T04:25:38Z In the Ross Sea, the prymnesiophyte Phaeocystis antarctica G. Karst. dominates deeply mixed water columns, while diatoms dominate shallower mixed layers. Understanding what controls the dynamics of these two phytoplankton taxa is essential because they dominate virtually all coastal polar waters, have different nutrient utilization characteristics, and support dissimilar food webs. We cultured two strains of P. antarctica and one strain of the diatom Fragilariopsis cylindrus (Grunow) Willi Krieg under three dynamic irradiance regimes that simulated different mixed‐layer depths and measured their photosynthetic characteristics, cellular pigment concentrations, and cellular carbon and nitrogen content. In both species, chl a –normalized maximum carbon uptake rate ( P m * ) and specific growth rate were highest in the deeply mixed treatment that had a dark period. In all irradiance treatments, both ( P m * ) and photosynthetic efficiency (α*) were greater for the two P. antarctica strains than for the F. cylindrus strain. In contrast, P. antarctica strains were more susceptible to photoinhibition (β*) than the F. cylindrus strain. When photosynthetic rates of each phytoplankton taxon were normalized by cellular particulate organic carbon (POC), the difference in the maximal photosynthetic rate ( ) was generally reduced. In the dynamic irradiance treatment that simulated the shallowest mixed‐layer irradiance, all three phytoplankton had similar however, the diatom had a 2‐fold higher POC‐normalized photosynthetic efficiency (α C ). Finally, we performed calculations using the measured POC‐normalized photosynthetic parameters to show that α C and can play a greater role than β C in determining the competitive outcome between P. antarctica and F. cylindrus in both shallow and deep mixed‐layer environments of the Ross Sea. Article in Journal/Newspaper Antarc* Antarctica Ross Sea Southern Ocean Wiley Online Library Ross Sea Southern Ocean Journal of Phycology 46 6 1114 1127
institution Open Polar
collection Wiley Online Library
op_collection_id crwiley
language English
description In the Ross Sea, the prymnesiophyte Phaeocystis antarctica G. Karst. dominates deeply mixed water columns, while diatoms dominate shallower mixed layers. Understanding what controls the dynamics of these two phytoplankton taxa is essential because they dominate virtually all coastal polar waters, have different nutrient utilization characteristics, and support dissimilar food webs. We cultured two strains of P. antarctica and one strain of the diatom Fragilariopsis cylindrus (Grunow) Willi Krieg under three dynamic irradiance regimes that simulated different mixed‐layer depths and measured their photosynthetic characteristics, cellular pigment concentrations, and cellular carbon and nitrogen content. In both species, chl a –normalized maximum carbon uptake rate ( P m * ) and specific growth rate were highest in the deeply mixed treatment that had a dark period. In all irradiance treatments, both ( P m * ) and photosynthetic efficiency (α*) were greater for the two P. antarctica strains than for the F. cylindrus strain. In contrast, P. antarctica strains were more susceptible to photoinhibition (β*) than the F. cylindrus strain. When photosynthetic rates of each phytoplankton taxon were normalized by cellular particulate organic carbon (POC), the difference in the maximal photosynthetic rate ( ) was generally reduced. In the dynamic irradiance treatment that simulated the shallowest mixed‐layer irradiance, all three phytoplankton had similar however, the diatom had a 2‐fold higher POC‐normalized photosynthetic efficiency (α C ). Finally, we performed calculations using the measured POC‐normalized photosynthetic parameters to show that α C and can play a greater role than β C in determining the competitive outcome between P. antarctica and F. cylindrus in both shallow and deep mixed‐layer environments of the Ross Sea.
format Article in Journal/Newspaper
author Mills, Matthew M.
Kropuenske, Lindsey R.
van Dijken, Gert L.
Alderkamp, Anne‐Carlijn
Berg, Gry Mine
Robinson, Dale H.
Welschmeyer, Nicholas A.
Arrigo, Kevin R.
spellingShingle Mills, Matthew M.
Kropuenske, Lindsey R.
van Dijken, Gert L.
Alderkamp, Anne‐Carlijn
Berg, Gry Mine
Robinson, Dale H.
Welschmeyer, Nicholas A.
Arrigo, Kevin R.
PHOTOPHYSIOLOGY IN TWO SOUTHERN OCEAN PHYTOPLANKTON TAXA: PHOTOSYNTHESIS OF PHAEOCYSTIS ANTARCTICA (PRYMNESIOPHYCEAE) AND FRAGILARIOPSIS CYLINDRUS (BACILLARIOPHYCEAE) UNDER SIMULATED MIXED‐LAYER IRRADIANCE 1
author_facet Mills, Matthew M.
Kropuenske, Lindsey R.
van Dijken, Gert L.
Alderkamp, Anne‐Carlijn
Berg, Gry Mine
Robinson, Dale H.
Welschmeyer, Nicholas A.
Arrigo, Kevin R.
author_sort Mills, Matthew M.
title PHOTOPHYSIOLOGY IN TWO SOUTHERN OCEAN PHYTOPLANKTON TAXA: PHOTOSYNTHESIS OF PHAEOCYSTIS ANTARCTICA (PRYMNESIOPHYCEAE) AND FRAGILARIOPSIS CYLINDRUS (BACILLARIOPHYCEAE) UNDER SIMULATED MIXED‐LAYER IRRADIANCE 1
title_short PHOTOPHYSIOLOGY IN TWO SOUTHERN OCEAN PHYTOPLANKTON TAXA: PHOTOSYNTHESIS OF PHAEOCYSTIS ANTARCTICA (PRYMNESIOPHYCEAE) AND FRAGILARIOPSIS CYLINDRUS (BACILLARIOPHYCEAE) UNDER SIMULATED MIXED‐LAYER IRRADIANCE 1
title_full PHOTOPHYSIOLOGY IN TWO SOUTHERN OCEAN PHYTOPLANKTON TAXA: PHOTOSYNTHESIS OF PHAEOCYSTIS ANTARCTICA (PRYMNESIOPHYCEAE) AND FRAGILARIOPSIS CYLINDRUS (BACILLARIOPHYCEAE) UNDER SIMULATED MIXED‐LAYER IRRADIANCE 1
title_fullStr PHOTOPHYSIOLOGY IN TWO SOUTHERN OCEAN PHYTOPLANKTON TAXA: PHOTOSYNTHESIS OF PHAEOCYSTIS ANTARCTICA (PRYMNESIOPHYCEAE) AND FRAGILARIOPSIS CYLINDRUS (BACILLARIOPHYCEAE) UNDER SIMULATED MIXED‐LAYER IRRADIANCE 1
title_full_unstemmed PHOTOPHYSIOLOGY IN TWO SOUTHERN OCEAN PHYTOPLANKTON TAXA: PHOTOSYNTHESIS OF PHAEOCYSTIS ANTARCTICA (PRYMNESIOPHYCEAE) AND FRAGILARIOPSIS CYLINDRUS (BACILLARIOPHYCEAE) UNDER SIMULATED MIXED‐LAYER IRRADIANCE 1
title_sort photophysiology in two southern ocean phytoplankton taxa: photosynthesis of phaeocystis antarctica (prymnesiophyceae) and fragilariopsis cylindrus (bacillariophyceae) under simulated mixed‐layer irradiance 1
publisher Wiley
publishDate 2010
url http://dx.doi.org/10.1111/j.1529-8817.2010.00923.x
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1529-8817.2010.00923.x
https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1529-8817.2010.00923.x
geographic Ross Sea
Southern Ocean
geographic_facet Ross Sea
Southern Ocean
genre Antarc*
Antarctica
Ross Sea
Southern Ocean
genre_facet Antarc*
Antarctica
Ross Sea
Southern Ocean
op_source Journal of Phycology
volume 46, issue 6, page 1114-1127
ISSN 0022-3646 1529-8817
op_rights http://onlinelibrary.wiley.com/termsAndConditions#vor
op_doi https://doi.org/10.1111/j.1529-8817.2010.00923.x
container_title Journal of Phycology
container_volume 46
container_issue 6
container_start_page 1114
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