Interannual variability in the distribution of the phytoplankton standing stock across the seasonal sea-ice zone west of the Antarctic Peninsula
The spatial distribution of phytoplankton cell abundance, carbon (C) biomass and chlorophyll a (Chl a ) concentration was analysed during three summers (1996, 1997 and 1999) in a seasonal sea-ice area, west of the Antarctic Peninsula. The objective of the study was to assess interannual variability...
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fthighwire:oai:open-archive.highwire.org:plankt:27/8/825 2023-05-15T13:33:45+02:00 Interannual variability in the distribution of the phytoplankton standing stock across the seasonal sea-ice zone west of the Antarctic Peninsula Garibotti, Irene A. Vernet, María Smith, Raymond C. Ferrario, Martha E. 2005-08-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/27/8/825 https://doi.org/10.1093/plankt/fbi056 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/27/8/825 http://dx.doi.org/10.1093/plankt/fbi056 Copyright (C) 2005, Oxford University Press ORIGINAL ARTICLES TEXT 2005 fthighwire https://doi.org/10.1093/plankt/fbi056 2013-05-26T13:54:29Z The spatial distribution of phytoplankton cell abundance, carbon (C) biomass and chlorophyll a (Chl a ) concentration was analysed during three summers (1996, 1997 and 1999) in a seasonal sea-ice area, west of the Antarctic Peninsula. The objective of the study was to assess interannual variability in phytoplankton spatial distribution and the mechanisms that regulate phytoplankton accumulation in the water column. Phytoplankton C biomass and Chl a distributions were consistent from year to year, exhibiting a negative on/offshore gradient. The variations in C concentration had a close and non-linear relationship with the upper mixed layer depth, suggesting that the vertical mixing of the water column is the main factor regulating phytoplankton stock. The magnitude of C gradients was 5-fold higher during 1996 than during 1997 and 1999. This was ascribed to interannual variations in the concentration of diatom blooms in the region influenced by sea-ice melting. Vertical distribution of the phytoplankton, as estimated from Chl a profiles, also varied along an on/offshore gradient: Chl a was distributed homogeneously in the upper mixed layer in coastal and mid-shelf stations and concentrated in the deep layer (40–100 m) occupied by the winter waters (WW, remnants of the Antarctic surface waters during summer) in more offshore stations. The region with a deep Chl a maximum layer (DCM layer) was dominated by a phytoplankton assemblage characterized by a relatively high concentration of diatoms. The extent of this region varied from year to year: it was restricted to pelagic waters during 1996, extended to the shelf slope during 1997 and occupied a major portion of the area during 1999. It is hypothesized that iron depletion in near surface waters due to phytoplankton consumption, and a higher concentration in WW, regulated this vertical phytoplankton distribution pattern. Furthermore, we postulate that year-to-year variations in the spatial distribution of the DCM layer were related to interannual variations in the ... Text Antarc* Antarctic Antarctic Peninsula Sea ice HighWire Press (Stanford University) Antarctic The Antarctic Antarctic Peninsula Journal of Plankton Research 27 8 825 843 |
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HighWire Press (Stanford University) |
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language |
English |
topic |
ORIGINAL ARTICLES |
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ORIGINAL ARTICLES Garibotti, Irene A. Vernet, María Smith, Raymond C. Ferrario, Martha E. Interannual variability in the distribution of the phytoplankton standing stock across the seasonal sea-ice zone west of the Antarctic Peninsula |
topic_facet |
ORIGINAL ARTICLES |
description |
The spatial distribution of phytoplankton cell abundance, carbon (C) biomass and chlorophyll a (Chl a ) concentration was analysed during three summers (1996, 1997 and 1999) in a seasonal sea-ice area, west of the Antarctic Peninsula. The objective of the study was to assess interannual variability in phytoplankton spatial distribution and the mechanisms that regulate phytoplankton accumulation in the water column. Phytoplankton C biomass and Chl a distributions were consistent from year to year, exhibiting a negative on/offshore gradient. The variations in C concentration had a close and non-linear relationship with the upper mixed layer depth, suggesting that the vertical mixing of the water column is the main factor regulating phytoplankton stock. The magnitude of C gradients was 5-fold higher during 1996 than during 1997 and 1999. This was ascribed to interannual variations in the concentration of diatom blooms in the region influenced by sea-ice melting. Vertical distribution of the phytoplankton, as estimated from Chl a profiles, also varied along an on/offshore gradient: Chl a was distributed homogeneously in the upper mixed layer in coastal and mid-shelf stations and concentrated in the deep layer (40–100 m) occupied by the winter waters (WW, remnants of the Antarctic surface waters during summer) in more offshore stations. The region with a deep Chl a maximum layer (DCM layer) was dominated by a phytoplankton assemblage characterized by a relatively high concentration of diatoms. The extent of this region varied from year to year: it was restricted to pelagic waters during 1996, extended to the shelf slope during 1997 and occupied a major portion of the area during 1999. It is hypothesized that iron depletion in near surface waters due to phytoplankton consumption, and a higher concentration in WW, regulated this vertical phytoplankton distribution pattern. Furthermore, we postulate that year-to-year variations in the spatial distribution of the DCM layer were related to interannual variations in the ... |
format |
Text |
author |
Garibotti, Irene A. Vernet, María Smith, Raymond C. Ferrario, Martha E. |
author_facet |
Garibotti, Irene A. Vernet, María Smith, Raymond C. Ferrario, Martha E. |
author_sort |
Garibotti, Irene A. |
title |
Interannual variability in the distribution of the phytoplankton standing stock across the seasonal sea-ice zone west of the Antarctic Peninsula |
title_short |
Interannual variability in the distribution of the phytoplankton standing stock across the seasonal sea-ice zone west of the Antarctic Peninsula |
title_full |
Interannual variability in the distribution of the phytoplankton standing stock across the seasonal sea-ice zone west of the Antarctic Peninsula |
title_fullStr |
Interannual variability in the distribution of the phytoplankton standing stock across the seasonal sea-ice zone west of the Antarctic Peninsula |
title_full_unstemmed |
Interannual variability in the distribution of the phytoplankton standing stock across the seasonal sea-ice zone west of the Antarctic Peninsula |
title_sort |
interannual variability in the distribution of the phytoplankton standing stock across the seasonal sea-ice zone west of the antarctic peninsula |
publisher |
Oxford University Press |
publishDate |
2005 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/27/8/825 https://doi.org/10.1093/plankt/fbi056 |
geographic |
Antarctic The Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Sea ice |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/27/8/825 http://dx.doi.org/10.1093/plankt/fbi056 |
op_rights |
Copyright (C) 2005, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/fbi056 |
container_title |
Journal of Plankton Research |
container_volume |
27 |
container_issue |
8 |
container_start_page |
825 |
op_container_end_page |
843 |
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1766045709042188288 |