Phytoplankton spatial distribution patterns along the western Antarctic Peninsula (Southern Ocean)
This paper describes spatial distribution patterns of the phytoplankton community (composition, cell abundance and biomass concentration) in relation to local environmental conditions in the Southern Ocean. Sampling was performed during summer 1997 off the coast of the western Antarctic Peninsula be...
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ftunivlaplata:oai:sedici.unlp.edu.ar:10915/84651 2023-05-15T13:47:46+02:00 Phytoplankton spatial distribution patterns along the western Antarctic Peninsula (Southern Ocean) Garibotti, Irene A. Vernet, María Ferrario, Martha Elba Smith, Raymond C. Ross, Robin M. Quetin, Langdon B. 2003 application/pdf 21-39 http://sedici.unlp.edu.ar/handle/10915/84651 en eng Marine Ecology Progress Series vol.261 http://sedici.unlp.edu.ar/handle/10915/84651 issn:0171-8630 http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) CC-BY-NC-SA Ciencias Naturales Environmental gradients Palmer LTER Phytoplankton spatial variability Seasonal progression Western Antarctic Peninsula Articulo 2003 ftunivlaplata 2020-10-18T00:01:53Z This paper describes spatial distribution patterns of the phytoplankton community (composition, cell abundance and biomass concentration) in relation to local environmental conditions in the Southern Ocean. Sampling was performed during summer 1997 off the coast of the western Antarctic Peninsula between Anvers Island and Marguerite Bay. Phytoplankton was characterized by relatively low biomass throughout most of the study area and was dominated by nanoalgae (<20 μm). Phytoplankton varied along an on-offshore gradient, with decreasing total cell abundance, chlorophyll a (chl a) concentration and carbon biomass toward the open ocean. Chl a concentration showed surface or subsurface maxima in coastal and middle-shelf waters, and deep maxima between ∼40 and 100 m in oceanic waters. Across-shelf variability in phytoplankton correlated with vertical stability in the water column, which appears to be the major parameter affecting phytoplankton community structure in the area. We hypothesize that the deep chl a maximum offshore may be associated with iron limitation in near-surface waters and higher iron concentration in 'winter waters' (subsurface remnant of Antarctic Surface Waters). On a smaller spatial scale, a cluster analysis showed great regional variability in phytoplankton assemblages. The area was divided into 4 main regions based on differences in the phytoplankton composition and concentration. Three peaks in phytoplankton abundance were found on a north-to-south gradient in near-shore waters: a Cryptomonas spp. bloom near Anvers Island, a small unidentified phytoflagellate bloom in Grandidier Channel, and a diatom bloom in Marguerite Bay. These assemblages resemble different stages of the phytoplankton seasonal succession, and may be related to the progressive sea-ice retreat, which might have regulated the timing of the onset of the phytoplankton seasonal succession in a north-south gradient. Biological environmental factors, such as seeding of the water column by epontic algae and selective zooplankton herbivory, are hypothesized to affect community composition in coastal regions. We conclude that large-scale variability in phytoplankton community structure is related to water column physical conditions and possibly iron availability, while mesoscale variability, as seen in coastal waters, is more likely due to seasonal succession of different algae groups. Facultad de Ciencias Naturales y Museo Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Anvers Island Sea ice Southern Ocean Universidad Nacional de La Plata (UNLP): SeDiCI (Servicio de Difusión de la Creación Intelectual) Antarctic Antarctic Peninsula Anvers ENVELOPE(-63.500,-63.500,-64.600,-64.600) Anvers Island ENVELOPE(-63.500,-63.500,-64.600,-64.600) Grandidier ENVELOPE(-64.650,-64.650,-65.533,-65.533) Grandidier Channel ENVELOPE(-65.000,-65.000,-65.500,-65.500) Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) Southern Ocean |
institution |
Open Polar |
collection |
Universidad Nacional de La Plata (UNLP): SeDiCI (Servicio de Difusión de la Creación Intelectual) |
op_collection_id |
ftunivlaplata |
language |
English |
topic |
Ciencias Naturales Environmental gradients Palmer LTER Phytoplankton spatial variability Seasonal progression Western Antarctic Peninsula |
spellingShingle |
Ciencias Naturales Environmental gradients Palmer LTER Phytoplankton spatial variability Seasonal progression Western Antarctic Peninsula Garibotti, Irene A. Vernet, María Ferrario, Martha Elba Smith, Raymond C. Ross, Robin M. Quetin, Langdon B. Phytoplankton spatial distribution patterns along the western Antarctic Peninsula (Southern Ocean) |
topic_facet |
Ciencias Naturales Environmental gradients Palmer LTER Phytoplankton spatial variability Seasonal progression Western Antarctic Peninsula |
description |
This paper describes spatial distribution patterns of the phytoplankton community (composition, cell abundance and biomass concentration) in relation to local environmental conditions in the Southern Ocean. Sampling was performed during summer 1997 off the coast of the western Antarctic Peninsula between Anvers Island and Marguerite Bay. Phytoplankton was characterized by relatively low biomass throughout most of the study area and was dominated by nanoalgae (<20 μm). Phytoplankton varied along an on-offshore gradient, with decreasing total cell abundance, chlorophyll a (chl a) concentration and carbon biomass toward the open ocean. Chl a concentration showed surface or subsurface maxima in coastal and middle-shelf waters, and deep maxima between ∼40 and 100 m in oceanic waters. Across-shelf variability in phytoplankton correlated with vertical stability in the water column, which appears to be the major parameter affecting phytoplankton community structure in the area. We hypothesize that the deep chl a maximum offshore may be associated with iron limitation in near-surface waters and higher iron concentration in 'winter waters' (subsurface remnant of Antarctic Surface Waters). On a smaller spatial scale, a cluster analysis showed great regional variability in phytoplankton assemblages. The area was divided into 4 main regions based on differences in the phytoplankton composition and concentration. Three peaks in phytoplankton abundance were found on a north-to-south gradient in near-shore waters: a Cryptomonas spp. bloom near Anvers Island, a small unidentified phytoflagellate bloom in Grandidier Channel, and a diatom bloom in Marguerite Bay. These assemblages resemble different stages of the phytoplankton seasonal succession, and may be related to the progressive sea-ice retreat, which might have regulated the timing of the onset of the phytoplankton seasonal succession in a north-south gradient. Biological environmental factors, such as seeding of the water column by epontic algae and selective zooplankton herbivory, are hypothesized to affect community composition in coastal regions. We conclude that large-scale variability in phytoplankton community structure is related to water column physical conditions and possibly iron availability, while mesoscale variability, as seen in coastal waters, is more likely due to seasonal succession of different algae groups. Facultad de Ciencias Naturales y Museo |
format |
Article in Journal/Newspaper |
author |
Garibotti, Irene A. Vernet, María Ferrario, Martha Elba Smith, Raymond C. Ross, Robin M. Quetin, Langdon B. |
author_facet |
Garibotti, Irene A. Vernet, María Ferrario, Martha Elba Smith, Raymond C. Ross, Robin M. Quetin, Langdon B. |
author_sort |
Garibotti, Irene A. |
title |
Phytoplankton spatial distribution patterns along the western Antarctic Peninsula (Southern Ocean) |
title_short |
Phytoplankton spatial distribution patterns along the western Antarctic Peninsula (Southern Ocean) |
title_full |
Phytoplankton spatial distribution patterns along the western Antarctic Peninsula (Southern Ocean) |
title_fullStr |
Phytoplankton spatial distribution patterns along the western Antarctic Peninsula (Southern Ocean) |
title_full_unstemmed |
Phytoplankton spatial distribution patterns along the western Antarctic Peninsula (Southern Ocean) |
title_sort |
phytoplankton spatial distribution patterns along the western antarctic peninsula (southern ocean) |
publishDate |
2003 |
url |
http://sedici.unlp.edu.ar/handle/10915/84651 |
long_lat |
ENVELOPE(-63.500,-63.500,-64.600,-64.600) ENVELOPE(-63.500,-63.500,-64.600,-64.600) ENVELOPE(-64.650,-64.650,-65.533,-65.533) ENVELOPE(-65.000,-65.000,-65.500,-65.500) ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) |
geographic |
Antarctic Antarctic Peninsula Anvers Anvers Island Grandidier Grandidier Channel Marguerite Marguerite Bay Southern Ocean |
geographic_facet |
Antarctic Antarctic Peninsula Anvers Anvers Island Grandidier Grandidier Channel Marguerite Marguerite Bay Southern Ocean |
genre |
Antarc* Antarctic Antarctic Peninsula Anvers Island Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Anvers Island Sea ice Southern Ocean |
op_relation |
Marine Ecology Progress Series vol.261 http://sedici.unlp.edu.ar/handle/10915/84651 issn:0171-8630 |
op_rights |
http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
op_rightsnorm |
CC-BY-NC-SA |
_version_ |
1766247829163999232 |