Distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the Southwestern Atlantic Ocean (30-61°S)
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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2006
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01427873_v28_n12_p1107_Olguin http://hdl.handle.net/20.500.12110/paper_01427873_v28_n12_p1107_Olguin |
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paper:paper_01427873_v28_n12_p1107_Olguin2023-06-08T15:11:30Z Distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the Southwestern Atlantic Ocean (30-61°S) Olguin Salinas, Héctor Fernando Boltovskoy, Demetrio Lange, Carina Beatriz abundance advection chlorophyll community composition diatom dinoflagellate phytoplankton surficial sediment transect vertical distribution Atlantic Ocean Atlantic Ocean (Southwest) Bacillariophyta Dictyochophyceae Dinophyceae 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. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01427873_v28_n12_p1107_Olguin http://hdl.handle.net/20.500.12110/paper_01427873_v28_n12_p1107_Olguin |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (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 Olguin Salinas, Héctor Fernando Boltovskoy, Demetrio Lange, Carina Beatriz 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. |
| author |
Olguin Salinas, Héctor Fernando Boltovskoy, Demetrio Lange, Carina Beatriz |
| author_facet |
Olguin Salinas, Héctor Fernando Boltovskoy, Demetrio Lange, Carina Beatriz |
| author_sort |
Olguin Salinas, Héctor Fernando |
| 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 |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01427873_v28_n12_p1107_Olguin http://hdl.handle.net/20.500.12110/paper_01427873_v28_n12_p1107_Olguin |
| work_keys_str_mv |
AT olguinsalinashectorfernando distributionofspringphytoplanktonmainlydiatomsintheupper50mofthesouthwesternatlanticocean3061s AT boltovskoydemetrio distributionofspringphytoplanktonmainlydiatomsintheupper50mofthesouthwesternatlanticocean3061s AT langecarinabeatriz distributionofspringphytoplanktonmainlydiatomsintheupper50mofthesouthwesternatlanticocean3061s |
| _version_ |
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