Patterns in tintinnid species composition and abundance in relation to hydrological conditions of the southwestern Atlantic during austral spring

The tintinnid community was assessed on a collection of 42 samples taken at depths of 5, 10, 25 and 50 m from 17 oceanographic stations located along 34 to 62° S, 51 to 57° W, in November 1995. Samples were collected by means of a Niskin bottle cast, and reverse-filtered through a 10 μm mesh filter....

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Autores principales: Thompson, G.A., Alder, V.A.
Formato: JOUR
Materias:
Biogeography
Brazil-Malvinas Confluence
Key species
Southwestern Atlantic
Tintinnid
Acanthostomella norvegica
Codonellopsis gaussi
Convallaria
Cymatocylis
Cymatocylis convallaria
Tintinnida
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09483055_v40_n1_p85_Thompson
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_09483055_v40_n1_p85_Thompson
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spelling todo:paper_09483055_v40_n1_p85_Thompson2023-10-03T15:49:33Z Patterns in tintinnid species composition and abundance in relation to hydrological conditions of the southwestern Atlantic during austral spring Thompson, G.A. Alder, V.A. Biogeography Brazil-Malvinas Confluence Key species Southwestern Atlantic Tintinnid Acanthostomella norvegica Codonellopsis gaussi Convallaria Cymatocylis Cymatocylis convallaria Tintinnida The tintinnid community was assessed on a collection of 42 samples taken at depths of 5, 10, 25 and 50 m from 17 oceanographic stations located along 34 to 62° S, 51 to 57° W, in November 1995. Samples were collected by means of a Niskin bottle cast, and reverse-filtered through a 10 μm mesh filter. A total of 60 tintinnid taxa were recorded, most of which with a distribution circumscribed to Antarctic, Subantarctic or Brazil-Malvinas Confluence waters, thus allowing the distinction of Antarctic, Subantarctic and Transitional biogeographic zones, respectively. A comparison based on the analysis of Niskin bottle versus flowmetered 35 μm mesh net paired samples indicated that absolute abundances of tintinnid species with diameters >40 μm almost did not differ between collecting methods. Tintinnid abundances and species structure reflected the degree of variability in the hydrological conditions of the southwestern Atlantic between 1994 and 1995. Sea surface temperature fluctuations within Brazil-Malvinas Confluence waters involved pronounced changes in the tintinnid communities of the Transition Zone: the increase of southward warm water transport during 1994 favoured the dominance of subtropical species along the ecotone, while its decrease during 1995 favoured the contribution of subantarctic species. Low hydrological variability in the Subantarctic and Antarctic Zones was reflected in a quite similar tintinnid community structure during these 2 years. Acanthostomella norvegica forma typica and Cymatocylis antarctica forma typica in the Subantarctic Zone, and Codonellopsis gaussi and Cymatocylis convallaria in the Antarctic Zone, might be regarded as key tintinnid species, based on their persistence and dominance. © Inter-Research 2005. Fil:Thompson, G.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Alder, V.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09483055_v40_n1_p85_Thompson
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Biogeography
Brazil-Malvinas Confluence
Key species
Southwestern Atlantic
Tintinnid
Acanthostomella norvegica
Codonellopsis gaussi
Convallaria
Cymatocylis
Cymatocylis convallaria
Tintinnida
spellingShingle Biogeography
Brazil-Malvinas Confluence
Key species
Southwestern Atlantic
Tintinnid
Acanthostomella norvegica
Codonellopsis gaussi
Convallaria
Cymatocylis
Cymatocylis convallaria
Tintinnida
Thompson, G.A.
Alder, V.A.
Patterns in tintinnid species composition and abundance in relation to hydrological conditions of the southwestern Atlantic during austral spring
topic_facet Biogeography
Brazil-Malvinas Confluence
Key species
Southwestern Atlantic
Tintinnid
Acanthostomella norvegica
Codonellopsis gaussi
Convallaria
Cymatocylis
Cymatocylis convallaria
Tintinnida
description The tintinnid community was assessed on a collection of 42 samples taken at depths of 5, 10, 25 and 50 m from 17 oceanographic stations located along 34 to 62° S, 51 to 57° W, in November 1995. Samples were collected by means of a Niskin bottle cast, and reverse-filtered through a 10 μm mesh filter. A total of 60 tintinnid taxa were recorded, most of which with a distribution circumscribed to Antarctic, Subantarctic or Brazil-Malvinas Confluence waters, thus allowing the distinction of Antarctic, Subantarctic and Transitional biogeographic zones, respectively. A comparison based on the analysis of Niskin bottle versus flowmetered 35 μm mesh net paired samples indicated that absolute abundances of tintinnid species with diameters >40 μm almost did not differ between collecting methods. Tintinnid abundances and species structure reflected the degree of variability in the hydrological conditions of the southwestern Atlantic between 1994 and 1995. Sea surface temperature fluctuations within Brazil-Malvinas Confluence waters involved pronounced changes in the tintinnid communities of the Transition Zone: the increase of southward warm water transport during 1994 favoured the dominance of subtropical species along the ecotone, while its decrease during 1995 favoured the contribution of subantarctic species. Low hydrological variability in the Subantarctic and Antarctic Zones was reflected in a quite similar tintinnid community structure during these 2 years. Acanthostomella norvegica forma typica and Cymatocylis antarctica forma typica in the Subantarctic Zone, and Codonellopsis gaussi and Cymatocylis convallaria in the Antarctic Zone, might be regarded as key tintinnid species, based on their persistence and dominance. © Inter-Research 2005.
format JOUR
author Thompson, G.A.
Alder, V.A.
author_facet Thompson, G.A.
Alder, V.A.
author_sort Thompson, G.A.
title Patterns in tintinnid species composition and abundance in relation to hydrological conditions of the southwestern Atlantic during austral spring
title_short Patterns in tintinnid species composition and abundance in relation to hydrological conditions of the southwestern Atlantic during austral spring
title_full Patterns in tintinnid species composition and abundance in relation to hydrological conditions of the southwestern Atlantic during austral spring
title_fullStr Patterns in tintinnid species composition and abundance in relation to hydrological conditions of the southwestern Atlantic during austral spring
title_full_unstemmed Patterns in tintinnid species composition and abundance in relation to hydrological conditions of the southwestern Atlantic during austral spring
title_sort patterns in tintinnid species composition and abundance in relation to hydrological conditions of the southwestern atlantic during austral spring
url http://hdl.handle.net/20.500.12110/paper_09483055_v40_n1_p85_Thompson
work_keys_str_mv AT thompsonga patternsintintinnidspeciescompositionandabundanceinrelationtohydrologicalconditionsofthesouthwesternatlanticduringaustralspring
AT alderva patternsintintinnidspeciescompositionandabundanceinrelationtohydrologicalconditionsofthesouthwesternatlanticduringaustralspring
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