Tintinnids (Ciliophora) and other net microzooplankton (> 30um) in south-western Atlantic shelf break waters

Proportions of foraminifers, tintinnids, polycystine radiolarians, pteropods and crustacean larval stages were estimated in a collection of 76 vertically stratified (0-100 m) 30 μm net microplankton samples from 16 stations along the Argentine shelf-slope (around 200 m isobath - between 40 and 56° S...

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Detalles Bibliográficos
Autores principales: Thompson, G.A., Alder, V.A., Boltovskoy, D.
Formato: JOUR
Materias:
Biogeography
Malvinas Current
Microzooplankton
Southwestern Atlantic
Tintinnina
microplankton
relative abundance
shelf break
zooplankton
Atlantic Ocean
Argentina (fish)
Ciliophora
Crustacea
Foraminifera
Pteropoda
Radiolaria (protozoans)
Tintinnida
Tintinnidae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01739565_v22_n4_p343_Thompson
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_01739565_v22_n4_p343_Thompson
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spelling todo:paper_01739565_v22_n4_p343_Thompson2023-10-03T15:07:43Z Tintinnids (Ciliophora) and other net microzooplankton (> 30um) in south-western Atlantic shelf break waters Thompson, G.A. Alder, V.A. Boltovskoy, D. Biogeography Malvinas Current Microzooplankton Southwestern Atlantic Tintinnina microplankton relative abundance shelf break zooplankton Atlantic Ocean Argentina (fish) Ciliophora Crustacea Foraminifera Pteropoda Radiolaria (protozoans) Tintinnida Tintinnidae Proportions of foraminifers, tintinnids, polycystine radiolarians, pteropods and crustacean larval stages were estimated in a collection of 76 vertically stratified (0-100 m) 30 μm net microplankton samples from 16 stations along the Argentine shelf-slope (around 200 m isobath - between 40 and 56° S), covered on 13-18 November 1996. Tintinnids were identified to species. Relative abundances of the microzooplankton assessed and chlorophyll a values allow to define two contrasting groups of stations: 'deep' and 'shallow'. The former, located in pelagic, purely subantarctic Malvinas Current waters, hosted higher proportions of foraminifers and lower proportions of tintinnids, as well as less chlorophyll a (all differences were significant at the 0.1% level). 'Shallow' stations were located in the area of the thermohaline front where the Patagonian Current comes in contact with the Malvinas Current, and were generally characterized by higher chlorophyll a levels (up to 3.7 μg Chl a · 1-1). The distribution of tintinnid species, on the other hand, allowed no discrimination between these two areas, although some of the dominant forms showed much higher relative abundances in one of the two groups of stations. Twenty-six tintinnid taxa were recorded, yet only 6 accounted for 95 % of the specimens identified. Tintinnid taxocoenoses were characterized by a few abundant species and many rare ones. Numbers of tintinnid species and specific diversity did not differ noticeably with depth and latitude. Cape Horn Current waters were detected in the area by the presence of expatriated organisms presumably originating at mid-latitudes in the South Pacific Ocean. 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. Fil:Boltovskoy, D. 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_01739565_v22_n4_p343_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
Malvinas Current
Microzooplankton
Southwestern Atlantic
Tintinnina
microplankton
relative abundance
shelf break
zooplankton
Atlantic Ocean
Argentina (fish)
Ciliophora
Crustacea
Foraminifera
Pteropoda
Radiolaria (protozoans)
Tintinnida
Tintinnidae
spellingShingle Biogeography
Malvinas Current
Microzooplankton
Southwestern Atlantic
Tintinnina
microplankton
relative abundance
shelf break
zooplankton
Atlantic Ocean
Argentina (fish)
Ciliophora
Crustacea
Foraminifera
Pteropoda
Radiolaria (protozoans)
Tintinnida
Tintinnidae
Thompson, G.A.
Alder, V.A.
Boltovskoy, D.
Tintinnids (Ciliophora) and other net microzooplankton (> 30um) in south-western Atlantic shelf break waters
topic_facet Biogeography
Malvinas Current
Microzooplankton
Southwestern Atlantic
Tintinnina
microplankton
relative abundance
shelf break
zooplankton
Atlantic Ocean
Argentina (fish)
Ciliophora
Crustacea
Foraminifera
Pteropoda
Radiolaria (protozoans)
Tintinnida
Tintinnidae
description Proportions of foraminifers, tintinnids, polycystine radiolarians, pteropods and crustacean larval stages were estimated in a collection of 76 vertically stratified (0-100 m) 30 μm net microplankton samples from 16 stations along the Argentine shelf-slope (around 200 m isobath - between 40 and 56° S), covered on 13-18 November 1996. Tintinnids were identified to species. Relative abundances of the microzooplankton assessed and chlorophyll a values allow to define two contrasting groups of stations: 'deep' and 'shallow'. The former, located in pelagic, purely subantarctic Malvinas Current waters, hosted higher proportions of foraminifers and lower proportions of tintinnids, as well as less chlorophyll a (all differences were significant at the 0.1% level). 'Shallow' stations were located in the area of the thermohaline front where the Patagonian Current comes in contact with the Malvinas Current, and were generally characterized by higher chlorophyll a levels (up to 3.7 μg Chl a · 1-1). The distribution of tintinnid species, on the other hand, allowed no discrimination between these two areas, although some of the dominant forms showed much higher relative abundances in one of the two groups of stations. Twenty-six tintinnid taxa were recorded, yet only 6 accounted for 95 % of the specimens identified. Tintinnid taxocoenoses were characterized by a few abundant species and many rare ones. Numbers of tintinnid species and specific diversity did not differ noticeably with depth and latitude. Cape Horn Current waters were detected in the area by the presence of expatriated organisms presumably originating at mid-latitudes in the South Pacific Ocean.
format JOUR
author Thompson, G.A.
Alder, V.A.
Boltovskoy, D.
author_facet Thompson, G.A.
Alder, V.A.
Boltovskoy, D.
author_sort Thompson, G.A.
title Tintinnids (Ciliophora) and other net microzooplankton (> 30um) in south-western Atlantic shelf break waters
title_short Tintinnids (Ciliophora) and other net microzooplankton (> 30um) in south-western Atlantic shelf break waters
title_full Tintinnids (Ciliophora) and other net microzooplankton (> 30um) in south-western Atlantic shelf break waters
title_fullStr Tintinnids (Ciliophora) and other net microzooplankton (> 30um) in south-western Atlantic shelf break waters
title_full_unstemmed Tintinnids (Ciliophora) and other net microzooplankton (> 30um) in south-western Atlantic shelf break waters
title_sort tintinnids (ciliophora) and other net microzooplankton (> 30um) in south-western atlantic shelf break waters
url http://hdl.handle.net/20.500.12110/paper_01739565_v22_n4_p343_Thompson
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AT alderva tintinnidsciliophoraandothernetmicrozooplankton30uminsouthwesternatlanticshelfbreakwaters
AT boltovskoyd tintinnidsciliophoraandothernetmicrozooplankton30uminsouthwesternatlanticshelfbreakwaters
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