Latitudinal patterns and interannual variations of spring phytoplankton in relation to hydrographic conditions of the southwestern Atlantic Ocean (34°–62°S)

In the present study, the distribution and abundance of microphytoplankton were assessed in the southwestern Atlantic Ocean from subtropical to polar waters (34°–62°S) in two austral springs with contrasting hydrographic conditions. Vertical profiles of open-ocean (ca. 54°W) samples (≥ 18 L filtered...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Olguin Salinas, Héctor Fernando, Boltovskoy, Demetrio
Publicado: 2015
Materias:
Atlantic
Biogeography
Brazil–Malvinas Confluence
Diatoms
annual variation
biogeography
diatom
environmental conditions
latitudinal gradient
phytoplankton
relative abundance
spatial distribution
spring (season)
Atlantic Ocean
Atlantic Ocean (Southwest)
Brazil-Malvinas Confluence
Bacillariophyta
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1438387X_v69_n2_p177_OlguinSalinas
http://hdl.handle.net/20.500.12110/paper_1438387X_v69_n2_p177_OlguinSalinas
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_1438387X_v69_n2_p177_OlguinSalinas
record_format dspace
spelling paper:paper_1438387X_v69_n2_p177_OlguinSalinas2023-06-08T16:15:54Z Latitudinal patterns and interannual variations of spring phytoplankton in relation to hydrographic conditions of the southwestern Atlantic Ocean (34°–62°S) Olguin Salinas, Héctor Fernando Boltovskoy, Demetrio Atlantic Biogeography Brazil–Malvinas Confluence Diatoms annual variation biogeography diatom environmental conditions latitudinal gradient phytoplankton relative abundance spatial distribution spring (season) Atlantic Ocean Atlantic Ocean (Southwest) Brazil-Malvinas Confluence Bacillariophyta In the present study, the distribution and abundance of microphytoplankton were assessed in the southwestern Atlantic Ocean from subtropical to polar waters (34°–62°S) in two austral springs with contrasting hydrographic conditions. Vertical profiles of open-ocean (ca. 54°W) samples (≥ 18 L filtered water) were performed in 20 stations (0–100 m) in 1994 and in 17 stations (0–50 m) in 1995. The latitudinal patterns of microphytoplankton groups, chlorophyll a, and diatom and silicoflagellate species were analyzed and compared with our previous study carried out in spring 1993 (30°–61°S). In the three springs, 197 diatom species, 173 of which showed mean relative density lower than 1 %, were identified. A consistent diatom biogeographic pattern emerged in the three consecutive springs, defining the Transitional (corresponding to the Brazil–Malvinas Current Confluence), Subantarctic and Antarctic Zones; and the Subantarctic and Polar Fronts, as their boundaries. This zonation reflects persistent features of this hydrographically heterogeneous region. The Polar Front was a weaker biogeographic boundary for diatom species than the Subantarctic Front. Interannual changes in diatoms (mainly in species richness, dominant species and degree of dominance of species with different ecological affinities) were detected. The Transitional Zone, which is one of the most hydrographically variable regions of the world ocean, showed the highest changes in the diatom assemblage, reflecting a colder spring in 1995 and a warmer spring in 1994 than normal (1993). These changes agreed with differences reported for 1993–1995 in large-scale hydrographic conditions, including a widespread diversity decrease in 1995 due to a weaker influence of subtropical waters. © 2015, Springer-Verlag Berlin Heidelberg and AWI. Fil:Olguín Salinas, 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. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1438387X_v69_n2_p177_OlguinSalinas http://hdl.handle.net/20.500.12110/paper_1438387X_v69_n2_p177_OlguinSalinas
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Atlantic
Biogeography
Brazil–Malvinas Confluence
Diatoms
annual variation
biogeography
diatom
environmental conditions
latitudinal gradient
phytoplankton
relative abundance
spatial distribution
spring (season)
Atlantic Ocean
Atlantic Ocean (Southwest)
Brazil-Malvinas Confluence
Bacillariophyta
spellingShingle Atlantic
Biogeography
Brazil–Malvinas Confluence
Diatoms
annual variation
biogeography
diatom
environmental conditions
latitudinal gradient
phytoplankton
relative abundance
spatial distribution
spring (season)
Atlantic Ocean
Atlantic Ocean (Southwest)
Brazil-Malvinas Confluence
Bacillariophyta
Olguin Salinas, Héctor Fernando
Boltovskoy, Demetrio
Latitudinal patterns and interannual variations of spring phytoplankton in relation to hydrographic conditions of the southwestern Atlantic Ocean (34°–62°S)
topic_facet Atlantic
Biogeography
Brazil–Malvinas Confluence
Diatoms
annual variation
biogeography
diatom
environmental conditions
latitudinal gradient
phytoplankton
relative abundance
spatial distribution
spring (season)
Atlantic Ocean
Atlantic Ocean (Southwest)
Brazil-Malvinas Confluence
Bacillariophyta
description In the present study, the distribution and abundance of microphytoplankton were assessed in the southwestern Atlantic Ocean from subtropical to polar waters (34°–62°S) in two austral springs with contrasting hydrographic conditions. Vertical profiles of open-ocean (ca. 54°W) samples (≥ 18 L filtered water) were performed in 20 stations (0–100 m) in 1994 and in 17 stations (0–50 m) in 1995. The latitudinal patterns of microphytoplankton groups, chlorophyll a, and diatom and silicoflagellate species were analyzed and compared with our previous study carried out in spring 1993 (30°–61°S). In the three springs, 197 diatom species, 173 of which showed mean relative density lower than 1 %, were identified. A consistent diatom biogeographic pattern emerged in the three consecutive springs, defining the Transitional (corresponding to the Brazil–Malvinas Current Confluence), Subantarctic and Antarctic Zones; and the Subantarctic and Polar Fronts, as their boundaries. This zonation reflects persistent features of this hydrographically heterogeneous region. The Polar Front was a weaker biogeographic boundary for diatom species than the Subantarctic Front. Interannual changes in diatoms (mainly in species richness, dominant species and degree of dominance of species with different ecological affinities) were detected. The Transitional Zone, which is one of the most hydrographically variable regions of the world ocean, showed the highest changes in the diatom assemblage, reflecting a colder spring in 1995 and a warmer spring in 1994 than normal (1993). These changes agreed with differences reported for 1993–1995 in large-scale hydrographic conditions, including a widespread diversity decrease in 1995 due to a weaker influence of subtropical waters. © 2015, Springer-Verlag Berlin Heidelberg and AWI.
author Olguin Salinas, Héctor Fernando
Boltovskoy, Demetrio
author_facet Olguin Salinas, Héctor Fernando
Boltovskoy, Demetrio
author_sort Olguin Salinas, Héctor Fernando
title Latitudinal patterns and interannual variations of spring phytoplankton in relation to hydrographic conditions of the southwestern Atlantic Ocean (34°–62°S)
title_short Latitudinal patterns and interannual variations of spring phytoplankton in relation to hydrographic conditions of the southwestern Atlantic Ocean (34°–62°S)
title_full Latitudinal patterns and interannual variations of spring phytoplankton in relation to hydrographic conditions of the southwestern Atlantic Ocean (34°–62°S)
title_fullStr Latitudinal patterns and interannual variations of spring phytoplankton in relation to hydrographic conditions of the southwestern Atlantic Ocean (34°–62°S)
title_full_unstemmed Latitudinal patterns and interannual variations of spring phytoplankton in relation to hydrographic conditions of the southwestern Atlantic Ocean (34°–62°S)
title_sort latitudinal patterns and interannual variations of spring phytoplankton in relation to hydrographic conditions of the southwestern atlantic ocean (34°–62°s)
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1438387X_v69_n2_p177_OlguinSalinas
http://hdl.handle.net/20.500.12110/paper_1438387X_v69_n2_p177_OlguinSalinas
work_keys_str_mv AT olguinsalinashectorfernando latitudinalpatternsandinterannualvariationsofspringphytoplanktoninrelationtohydrographicconditionsofthesouthwesternatlanticocean3462s
AT boltovskoydemetrio latitudinalpatternsandinterannualvariationsofspringphytoplanktoninrelationtohydrographicconditionsofthesouthwesternatlanticocean3462s
_version_ 1768546317115588608

Ejemplares similares