Contrasting Photo-physiological Responses of the Haptophyte Phaeocystis Antarctica and the Diatom Pseudonitzschia sp. in the Ross Sea (Antarctica)
The Antarctic is a unique environment in which substantial variations in irradiance occur over a number of time scales, and as a result phytoplankton need to acclimate and adapt to these changes. We conducted field and laboratory manipulations in the Ross Sea, Antarctica to examine photophysiologica...
Published in: | AIMS Geosciences |
---|---|
Main Authors: | , |
Format: | Text |
Language: | unknown |
Published: |
W&M ScholarWorks
2017
|
Subjects: | |
Online Access: | https://scholarworks.wm.edu/vimsarticles/22 https://scholarworks.wm.edu/context/vimsarticles/article/1021/viewcontent/geosci_03_00142.pdf |
id |
ftwilliammarycol:oai:scholarworks.wm.edu:vimsarticles-1021 |
---|---|
record_format |
openpolar |
spelling |
ftwilliammarycol:oai:scholarworks.wm.edu:vimsarticles-1021 2024-06-23T07:47:20+00:00 Contrasting Photo-physiological Responses of the Haptophyte Phaeocystis Antarctica and the Diatom Pseudonitzschia sp. in the Ross Sea (Antarctica) Tozzi, Sasha Smith, Walker O., Jr. 2017-01-01T08:00:00Z application/pdf https://scholarworks.wm.edu/vimsarticles/22 doi: 10.3934/geosci.2017.2.142 https://scholarworks.wm.edu/context/vimsarticles/article/1021/viewcontent/geosci_03_00142.pdf unknown W&M ScholarWorks https://scholarworks.wm.edu/vimsarticles/22 doi: 10.3934/geosci.2017.2.142 https://scholarworks.wm.edu/context/vimsarticles/article/1021/viewcontent/geosci_03_00142.pdf http://creativecommons.org/licenses/by/4.0/ VIMS Articles PHYTOPLANKTON TAXA SOUTHERN-OCEAN FRAGILARIOPSIS-CYLINDRUS CHLOROPHYLL FLUORESCENCE LIGHT STRESS IRON GROWTH PRYMNESIOPHYCEAE PHOTOPHYSIOLOGY PHOTOPROTECTION Biological Sciences Peer-Reviewed Articles Marine Biology text 2017 ftwilliammarycol https://doi.org/10.3934/geosci.2017.2.142 2024-06-05T03:29:28Z The Antarctic is a unique environment in which substantial variations in irradiance occur over a number of time scales, and as a result phytoplankton need to acclimate and adapt to these changes. We conducted field and laboratory manipulations in the Ross Sea, Antarctica to examine photophysiological differences between Phaeocystis antarctica and Pseudonitzschia sp. a diatom that commonly occurrs in the Ross Sea, since these are the two functional groups that dominate abundance and productivity. Both exhibited reduced quantum yields due to high irradiances. P. antarctica, a haptophyte, displays a distinct photophysiological response to irradiance when compared to diatoms. P. antarctica showed a rapid recovery from high light exposure, as indicated by the rapid return to initial, high quantum yields, in contrast to diatoms, which responded more slowly. Absorption cross sections were high in both forms, but those in P. antarctica were significantly higher. Both organisms recovered within 24 h to initial quantum yields, suggesting that high irradiance exposure does not have a permanent effect on these organisms. Among all micronutrient additions (iron, cobalt, zinc and vitamin B-12), only iron additions resulted in rapid impacts on quantum yields. Iron limitation also can result in reduced photosynthetic efficiency. Understanding these photophysiologial responses and the impact of oceanographic conditions provides constraints on modeling efforts of photosynthesis and primary productivity in the Antarctic. Text Antarc* Antarctic Antarctica Ross Sea Southern Ocean W&M ScholarWorks Antarctic Ross Sea Southern Ocean The Antarctic AIMS Geosciences 3 2 142 162 |
institution |
Open Polar |
collection |
W&M ScholarWorks |
op_collection_id |
ftwilliammarycol |
language |
unknown |
topic |
PHYTOPLANKTON TAXA SOUTHERN-OCEAN FRAGILARIOPSIS-CYLINDRUS CHLOROPHYLL FLUORESCENCE LIGHT STRESS IRON GROWTH PRYMNESIOPHYCEAE PHOTOPHYSIOLOGY PHOTOPROTECTION Biological Sciences Peer-Reviewed Articles Marine Biology |
spellingShingle |
PHYTOPLANKTON TAXA SOUTHERN-OCEAN FRAGILARIOPSIS-CYLINDRUS CHLOROPHYLL FLUORESCENCE LIGHT STRESS IRON GROWTH PRYMNESIOPHYCEAE PHOTOPHYSIOLOGY PHOTOPROTECTION Biological Sciences Peer-Reviewed Articles Marine Biology Tozzi, Sasha Smith, Walker O., Jr. Contrasting Photo-physiological Responses of the Haptophyte Phaeocystis Antarctica and the Diatom Pseudonitzschia sp. in the Ross Sea (Antarctica) |
topic_facet |
PHYTOPLANKTON TAXA SOUTHERN-OCEAN FRAGILARIOPSIS-CYLINDRUS CHLOROPHYLL FLUORESCENCE LIGHT STRESS IRON GROWTH PRYMNESIOPHYCEAE PHOTOPHYSIOLOGY PHOTOPROTECTION Biological Sciences Peer-Reviewed Articles Marine Biology |
description |
The Antarctic is a unique environment in which substantial variations in irradiance occur over a number of time scales, and as a result phytoplankton need to acclimate and adapt to these changes. We conducted field and laboratory manipulations in the Ross Sea, Antarctica to examine photophysiological differences between Phaeocystis antarctica and Pseudonitzschia sp. a diatom that commonly occurrs in the Ross Sea, since these are the two functional groups that dominate abundance and productivity. Both exhibited reduced quantum yields due to high irradiances. P. antarctica, a haptophyte, displays a distinct photophysiological response to irradiance when compared to diatoms. P. antarctica showed a rapid recovery from high light exposure, as indicated by the rapid return to initial, high quantum yields, in contrast to diatoms, which responded more slowly. Absorption cross sections were high in both forms, but those in P. antarctica were significantly higher. Both organisms recovered within 24 h to initial quantum yields, suggesting that high irradiance exposure does not have a permanent effect on these organisms. Among all micronutrient additions (iron, cobalt, zinc and vitamin B-12), only iron additions resulted in rapid impacts on quantum yields. Iron limitation also can result in reduced photosynthetic efficiency. Understanding these photophysiologial responses and the impact of oceanographic conditions provides constraints on modeling efforts of photosynthesis and primary productivity in the Antarctic. |
format |
Text |
author |
Tozzi, Sasha Smith, Walker O., Jr. |
author_facet |
Tozzi, Sasha Smith, Walker O., Jr. |
author_sort |
Tozzi, Sasha |
title |
Contrasting Photo-physiological Responses of the Haptophyte Phaeocystis Antarctica and the Diatom Pseudonitzschia sp. in the Ross Sea (Antarctica) |
title_short |
Contrasting Photo-physiological Responses of the Haptophyte Phaeocystis Antarctica and the Diatom Pseudonitzschia sp. in the Ross Sea (Antarctica) |
title_full |
Contrasting Photo-physiological Responses of the Haptophyte Phaeocystis Antarctica and the Diatom Pseudonitzschia sp. in the Ross Sea (Antarctica) |
title_fullStr |
Contrasting Photo-physiological Responses of the Haptophyte Phaeocystis Antarctica and the Diatom Pseudonitzschia sp. in the Ross Sea (Antarctica) |
title_full_unstemmed |
Contrasting Photo-physiological Responses of the Haptophyte Phaeocystis Antarctica and the Diatom Pseudonitzschia sp. in the Ross Sea (Antarctica) |
title_sort |
contrasting photo-physiological responses of the haptophyte phaeocystis antarctica and the diatom pseudonitzschia sp. in the ross sea (antarctica) |
publisher |
W&M ScholarWorks |
publishDate |
2017 |
url |
https://scholarworks.wm.edu/vimsarticles/22 https://scholarworks.wm.edu/context/vimsarticles/article/1021/viewcontent/geosci_03_00142.pdf |
geographic |
Antarctic Ross Sea Southern Ocean The Antarctic |
geographic_facet |
Antarctic Ross Sea Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Ross Sea Southern Ocean |
op_source |
VIMS Articles |
op_relation |
https://scholarworks.wm.edu/vimsarticles/22 doi: 10.3934/geosci.2017.2.142 https://scholarworks.wm.edu/context/vimsarticles/article/1021/viewcontent/geosci_03_00142.pdf |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3934/geosci.2017.2.142 |
container_title |
AIMS Geosciences |
container_volume |
3 |
container_issue |
2 |
container_start_page |
142 |
op_container_end_page |
162 |
_version_ |
1802651417900482560 |