Distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the Southwestern Atlantic Ocean (30-61°S)

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This is the first study on diatom spatial patterns in relation to major oceanographic features along a megascale transect in the Southwestern Atlantic Ocean and provides a comparison with diatom distribution in surface sediments. Absolute abundances of diatoms, silicoflagellates and dinoflagellates...

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Autores principales: Olguín, H.F., Boltovskoy, D., Lange, C.B., Brandini, F.
Formato: Artículo publishedVersion
Publicado: 2006
Materias:
abundance
advection
chlorophyll
community composition
diatom
dinoflagellate
phytoplankton
surficial sediment
transect
vertical distribution
Atlantic Ocean
Atlantic Ocean (Southwest)
Bacillariophyta
Dictyochophyceae
Dinophyceae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01427873_v28_n12_p1107_Olguin
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_01427873_v28_n12_p1107_Olguin_oai
Aporte de:
Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires
id I28-R145-paper_01427873_v28_n12_p1107_Olguin_oai
record_format dspace
spelling I28-R145-paper_01427873_v28_n12_p1107_Olguin_oai2024-08-16 Olguín, H.F. Boltovskoy, D. Lange, C.B. Brandini, F. 2006 This is the first study on diatom spatial patterns in relation to major oceanographic features along a megascale transect in the Southwestern Atlantic Ocean and provides a comparison with diatom distribution in surface sediments. Absolute abundances of diatoms, silicoflagellates and dinoflagellates (>10-μm fraction) were assessed in 80 bottle samples from 5 to 50 m, retrieved in November 1993 at 20 stations (30-61°S) along 53°W. Siliceous phytoplankton were scarce in the northern half of the transect and in the south of 57°S (100-150 cells L-1), with a strong peak in the vicinity of the Polar Front (∼200 000 cells L-1), whereas dinoflagellates were more abundant at the northern stations (up to 24 000 cells L-1). In the south of 50°S phytoplanktonic cell densities were loosely (but significantly, r = 0.54, P < 0.01) associated with chlorophyll a, whereas in the north of this latitude, this relationship disappeared (r = 0.018, P > 0.1). In total, 191 diatoms and 4 silicoflagellates were recorded. Changes in diatom assemblage compositions along the transect allowed identification of five discrete areas: Subtropical (29°S), Northern Transitional (34-41°S), Southern Transitional (43-48°S), Subantarctic (49-54°S) and Antarctic (55-59°S), each characterized by a set of typical species. Diversity changed little with latitude, but numbers of species were higher in the north of 40°S. Comparison of diatom assemblage makeup in the plankton and in the surface sediments shows very strong disagreements, whereby cold water species are very significantly over-represented in the sedimentary record, suggesting enhanced preservation and strong subsurface equatorward advection of the cold water taxa. © The Author 2006. Published by Oxford University Press. All rights reserved. Fil:Olguín, H.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Boltovskoy, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lange, C.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_01427873_v28_n12_p1107_Olguin info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar J. Plankton Res. 2006;28(12):1107-1128 abundance advection chlorophyll community composition diatom dinoflagellate phytoplankton surficial sediment transect vertical distribution Atlantic Ocean Atlantic Ocean (Southwest) Bacillariophyta Dictyochophyceae Dinophyceae Distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the Southwestern Atlantic Ocean (30-61°S) info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_01427873_v28_n12_p1107_Olguin_oai
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-145
collection Repositorio Digital de la Universidad de Buenos Aires (UBA)
topic abundance
advection
chlorophyll
community composition
diatom
dinoflagellate
phytoplankton
surficial sediment
transect
vertical distribution
Atlantic Ocean
Atlantic Ocean (Southwest)
Bacillariophyta
Dictyochophyceae
Dinophyceae
spellingShingle abundance
advection
chlorophyll
community composition
diatom
dinoflagellate
phytoplankton
surficial sediment
transect
vertical distribution
Atlantic Ocean
Atlantic Ocean (Southwest)
Bacillariophyta
Dictyochophyceae
Dinophyceae
Olguín, H.F.
Boltovskoy, D.
Lange, C.B.
Brandini, F.
Distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the Southwestern Atlantic Ocean (30-61°S)
topic_facet abundance
advection
chlorophyll
community composition
diatom
dinoflagellate
phytoplankton
surficial sediment
transect
vertical distribution
Atlantic Ocean
Atlantic Ocean (Southwest)
Bacillariophyta
Dictyochophyceae
Dinophyceae
description This is the first study on diatom spatial patterns in relation to major oceanographic features along a megascale transect in the Southwestern Atlantic Ocean and provides a comparison with diatom distribution in surface sediments. Absolute abundances of diatoms, silicoflagellates and dinoflagellates (>10-μm fraction) were assessed in 80 bottle samples from 5 to 50 m, retrieved in November 1993 at 20 stations (30-61°S) along 53°W. Siliceous phytoplankton were scarce in the northern half of the transect and in the south of 57°S (100-150 cells L-1), with a strong peak in the vicinity of the Polar Front (∼200 000 cells L-1), whereas dinoflagellates were more abundant at the northern stations (up to 24 000 cells L-1). In the south of 50°S phytoplanktonic cell densities were loosely (but significantly, r = 0.54, P < 0.01) associated with chlorophyll a, whereas in the north of this latitude, this relationship disappeared (r = 0.018, P > 0.1). In total, 191 diatoms and 4 silicoflagellates were recorded. Changes in diatom assemblage compositions along the transect allowed identification of five discrete areas: Subtropical (29°S), Northern Transitional (34-41°S), Southern Transitional (43-48°S), Subantarctic (49-54°S) and Antarctic (55-59°S), each characterized by a set of typical species. Diversity changed little with latitude, but numbers of species were higher in the north of 40°S. Comparison of diatom assemblage makeup in the plankton and in the surface sediments shows very strong disagreements, whereby cold water species are very significantly over-represented in the sedimentary record, suggesting enhanced preservation and strong subsurface equatorward advection of the cold water taxa. © The Author 2006. Published by Oxford University Press. All rights reserved.
format Artículo
Artículo
publishedVersion
author Olguín, H.F.
Boltovskoy, D.
Lange, C.B.
Brandini, F.
author_facet Olguín, H.F.
Boltovskoy, D.
Lange, C.B.
Brandini, F.
author_sort Olguín, H.F.
title Distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the Southwestern Atlantic Ocean (30-61°S)
title_short Distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the Southwestern Atlantic Ocean (30-61°S)
title_full Distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the Southwestern Atlantic Ocean (30-61°S)
title_fullStr Distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the Southwestern Atlantic Ocean (30-61°S)
title_full_unstemmed Distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the Southwestern Atlantic Ocean (30-61°S)
title_sort distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the southwestern atlantic ocean (30-61°s)
publishDate 2006
url http://hdl.handle.net/20.500.12110/paper_01427873_v28_n12_p1107_Olguin
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_01427873_v28_n12_p1107_Olguin_oai
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AT langecb distributionofspringphytoplanktonmainlydiatomsintheupper50mofthesouthwesternatlanticocean3061s
AT brandinif distributionofspringphytoplanktonmainlydiatomsintheupper50mofthesouthwesternatlanticocean3061s
_version_ 1809356900036247552

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