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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ftunibueairesbd:paper:paper_09483055_v40_n1_p85_Thompson 2023-05-15T13:50:11+02:00 Patterns in tintinnid species composition and abundance in relation to hydrological conditions of the southwestern Atlantic during austral spring Thompson, Gustavo Ariel Alder, Viviana A. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09483055_v40_n1_p85_Thompson https://hdl.handle.net/20.500.12110/paper_09483055_v40_n1_p85_Thompson unknown https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09483055_v40_n1_p85_Thompson http://hdl.handle.net/20.500.12110/paper_09483055_v40_n1_p85_Thompson Biogeography Brazil-Malvinas Confluence Key species Southwestern Atlantic Tintinnid Acanthostomella norvegica Codonellopsis gaussi Convallaria Cymatocylis Cymatocylis convallaria Tintinnida 2005 ftunibueairesbd https://doi.org/20.500.12110/paper_09483055_v40_n1_p85_Thompson 2023-02-16T02:26:38Z 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. Other/Unknown Material Antarc* Antarctic Antarctica Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) Antarctic Argentina Austral The Antarctic |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
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, Gustavo Ariel Alder, Viviana 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. 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. |
author |
Thompson, Gustavo Ariel Alder, Viviana A. |
author_facet |
Thompson, Gustavo Ariel Alder, Viviana A. |
author_sort |
Thompson, Gustavo Ariel |
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 |
publishDate |
2005 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09483055_v40_n1_p85_Thompson https://hdl.handle.net/20.500.12110/paper_09483055_v40_n1_p85_Thompson |
geographic |
Antarctic Argentina Austral The Antarctic |
geographic_facet |
Antarctic Argentina Austral The Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09483055_v40_n1_p85_Thompson http://hdl.handle.net/20.500.12110/paper_09483055_v40_n1_p85_Thompson |
op_doi |
https://doi.org/20.500.12110/paper_09483055_v40_n1_p85_Thompson |
_version_ |
1766253185486290944 |