Factors controlling phytoplankton physiological state around the South Shetland Islands (Antarctica)
To investigate factors controlling phytoplankton physiological state around the South Shetland Islands, phytoplankton abundance and structure, fluorescence properties, photo - protective pigment composition and physicochemical variables were studied. Nano phyto plank - tonic cells (<20 μm) contri...
Published in: | Marine Ecology Progress Series |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Inter Research
2014
|
Subjects: | |
Online Access: | http://hdl.handle.net/10261/102428 https://doi.org/10.3354/meps10616 |
id |
ftcsic:oai:digital.csic.es:10261/102428 |
---|---|
record_format |
openpolar |
spelling |
ftcsic:oai:digital.csic.es:10261/102428 2024-02-11T09:56:55+01:00 Factors controlling phytoplankton physiological state around the South Shetland Islands (Antarctica) García Muñoz, Cristina Sobrino, Cristina Lubián, Luis M. García, Carlos M. 2014 http://hdl.handle.net/10261/102428 https://doi.org/10.3354/meps10616 unknown Inter Research http://doi.org/10.3354/meps10616 doi:10.3354/meps10616 issn: 0171-8630 e-issn: 1616-1599 Marine Ecology - Progress Series 498: 55-71 (2014) http://hdl.handle.net/10261/102428 none Irradiance Phytoplankton Fv/Fm Size Mixed layer South Shetland Islands Nutrients artículo http://purl.org/coar/resource_type/c_6501 2014 ftcsic https://doi.org/10.3354/meps10616 2024-01-16T10:01:20Z To investigate factors controlling phytoplankton physiological state around the South Shetland Islands, phytoplankton abundance and structure, fluorescence properties, photo - protective pigment composition and physicochemical variables were studied. Nano phyto plank - tonic cells (<20 μm) contributed 84% of total chlorophyll a (chl a), except for the station closest to the Antarctic Peninsula where microplanktonic cells (>20 μm) predominated (up to 85% of total chl a). Daily irradiance over the mixed layer depth (MLD) was inversely related with integrated nanoplanktonic chl a; however, its relative contribution to total chl a increased at mid-irradiance values. The average maximum quantum yield of photosystem II (Fv/Fm) below 20 m depth ranged from 0.17 to 0.53 and showed that cells were under suboptimal physiological conditions in the Drake region, but had higher performance around the South Shetland Islands and towards the Antarctic Peninsula. A reverse pattern in the fluorescence yield was detected. A deeper exa - mination of the Fv/Fm vertical profiles according to the sampling time detected surface photoinhibition during the day and a spatial modulation of Fv/Fm related to irradiance and the silicic acid:nitrate ratio. It appears that cells' photosynthetic performance was controlled by iron limitation in the Drake region, whereas irradiance regime controlled phytoplankton physiological state in the rest of the studied regions. Vertical mixing differences among stations, the relative position of the euphotic layer depth with respect to the MLD and the photoprotective pigment ratios revealed contrasting responses to light stress among the different phytoplanktonic groups, revealing a better adaptation of medium size cells, especially diatoms, to stratified waters receiving high irradiance. © Inter-Research 2014. Peer Reviewed Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica South Shetland Islands Digital.CSIC (Spanish National Research Council) Antarctic Antarctic Peninsula South Shetland Islands The Antarctic Marine Ecology Progress Series 498 55 71 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Irradiance Phytoplankton Fv/Fm Size Mixed layer South Shetland Islands Nutrients |
spellingShingle |
Irradiance Phytoplankton Fv/Fm Size Mixed layer South Shetland Islands Nutrients García Muñoz, Cristina Sobrino, Cristina Lubián, Luis M. García, Carlos M. Factors controlling phytoplankton physiological state around the South Shetland Islands (Antarctica) |
topic_facet |
Irradiance Phytoplankton Fv/Fm Size Mixed layer South Shetland Islands Nutrients |
description |
To investigate factors controlling phytoplankton physiological state around the South Shetland Islands, phytoplankton abundance and structure, fluorescence properties, photo - protective pigment composition and physicochemical variables were studied. Nano phyto plank - tonic cells (<20 μm) contributed 84% of total chlorophyll a (chl a), except for the station closest to the Antarctic Peninsula where microplanktonic cells (>20 μm) predominated (up to 85% of total chl a). Daily irradiance over the mixed layer depth (MLD) was inversely related with integrated nanoplanktonic chl a; however, its relative contribution to total chl a increased at mid-irradiance values. The average maximum quantum yield of photosystem II (Fv/Fm) below 20 m depth ranged from 0.17 to 0.53 and showed that cells were under suboptimal physiological conditions in the Drake region, but had higher performance around the South Shetland Islands and towards the Antarctic Peninsula. A reverse pattern in the fluorescence yield was detected. A deeper exa - mination of the Fv/Fm vertical profiles according to the sampling time detected surface photoinhibition during the day and a spatial modulation of Fv/Fm related to irradiance and the silicic acid:nitrate ratio. It appears that cells' photosynthetic performance was controlled by iron limitation in the Drake region, whereas irradiance regime controlled phytoplankton physiological state in the rest of the studied regions. Vertical mixing differences among stations, the relative position of the euphotic layer depth with respect to the MLD and the photoprotective pigment ratios revealed contrasting responses to light stress among the different phytoplanktonic groups, revealing a better adaptation of medium size cells, especially diatoms, to stratified waters receiving high irradiance. © Inter-Research 2014. Peer Reviewed |
format |
Article in Journal/Newspaper |
author |
García Muñoz, Cristina Sobrino, Cristina Lubián, Luis M. García, Carlos M. |
author_facet |
García Muñoz, Cristina Sobrino, Cristina Lubián, Luis M. García, Carlos M. |
author_sort |
García Muñoz, Cristina |
title |
Factors controlling phytoplankton physiological state around the South Shetland Islands (Antarctica) |
title_short |
Factors controlling phytoplankton physiological state around the South Shetland Islands (Antarctica) |
title_full |
Factors controlling phytoplankton physiological state around the South Shetland Islands (Antarctica) |
title_fullStr |
Factors controlling phytoplankton physiological state around the South Shetland Islands (Antarctica) |
title_full_unstemmed |
Factors controlling phytoplankton physiological state around the South Shetland Islands (Antarctica) |
title_sort |
factors controlling phytoplankton physiological state around the south shetland islands (antarctica) |
publisher |
Inter Research |
publishDate |
2014 |
url |
http://hdl.handle.net/10261/102428 https://doi.org/10.3354/meps10616 |
geographic |
Antarctic Antarctic Peninsula South Shetland Islands The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula South Shetland Islands The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica South Shetland Islands |
op_relation |
http://doi.org/10.3354/meps10616 doi:10.3354/meps10616 issn: 0171-8630 e-issn: 1616-1599 Marine Ecology - Progress Series 498: 55-71 (2014) http://hdl.handle.net/10261/102428 |
op_rights |
none |
op_doi |
https://doi.org/10.3354/meps10616 |
container_title |
Marine Ecology Progress Series |
container_volume |
498 |
container_start_page |
55 |
op_container_end_page |
71 |
_version_ |
1790607036021473280 |