Microplanktonic distributional patterns west of the Antarctic Peninsula, with special emphasis on the Tintinnids

Microplankton was sampled with a centrifugal suction pump in the surface layer (approx. 9 m) of the Bellingshausen Sea and the Bransfield Strait in March 1987, and concentrated with a 26 μm-mesh net. Bulk microplanktonic settling volumes were assessed, silicoflagellates and large thecate dinoflagell...

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Autores principales: Alder, Viviana A., Boltovskoy, Demetrio
Publicado: 1991
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07224060_v11_n2_p103_Alder
http://hdl.handle.net/20.500.12110/paper_07224060_v11_n2_p103_Alder
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_07224060_v11_n2_p103_Alder
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spelling paper:paper_07224060_v11_n2_p103_Alder2023-06-08T15:43:24Z Microplanktonic distributional patterns west of the Antarctic Peninsula, with special emphasis on the Tintinnids Alder, Viviana A. Boltovskoy, Demetrio Microplankton was sampled with a centrifugal suction pump in the surface layer (approx. 9 m) of the Bellingshausen Sea and the Bransfield Strait in March 1987, and concentrated with a 26 μm-mesh net. Bulk microplanktonic settling volumes were assessed, silicoflagellates and large thecate dinoflagellates were counted, and tintinnids were counted and identified to species. Average (and maximum) values for the entire area surveyed were as follows, settling volume: 6.7 (43.3) ml/m3; silicoflagellates: 674 (7777) ind./l, 0.57 (6.54) mg C/m3; dinoflagellates: 109 (1321) ind./l, 1.40 (16.98) mg C/m3; tintinnids: 52 (589) ind./l, 1.15 (9.87) mg C/m3. The three geographic zones defined objectively on the basis of tintinnid specific assemblages also differed sharply in their surface salinity, overall microplanktonic abundance and bulk settling volume. The Bransfield Strait, with lowest settling volume values (2.1 ml/m3) and cell concentrations, was characterized by the dominance of Cymatocylis affinis/convallaria. In waters around the tip of the Antarctic Peninsula microplanktonic settling volumes averaged 4.6 ml/m3, cell concentrations were intermediate, and 79% of the tintinnids were represented by Codonellopsis balechi. The Bellingshausen Sea was characterized by the lowest salinities and the highest settling volumes (8.7 ml/m3) and cell counts; Laackmanniella spp. and Cymatocylis drygalskii, f. typica dominated this area. Almost all biological variables were significantly intercorrelated, and showed strong and mostly significant negative correlations with surface salinity, yet relationships between enhanced standing stock and ice meltwater were not obvious; rather, highest microplanktonic concentrations seemed to be due to ice-associated growth. Extremely high spatial correlations were found between the tintinnids and the dinoflagellates (r2: 0.941), suggesting the existence of close links between these two groups. Tintinnid species-specific assemblages show a coherent distributional pattern and well defined environment-related trends; most clearly differentiated preferences are exhibited by Laackmanniella prolongata (closely associated with ice-covered areas), Cymatocylis affinis/convallaria (oligotrophic open-ocean waters), and Codonellopsis balechi (coastal regions). © 1991 Springer-Verlag. 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. 1991 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07224060_v11_n2_p103_Alder http://hdl.handle.net/20.500.12110/paper_07224060_v11_n2_p103_Alder
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Microplankton was sampled with a centrifugal suction pump in the surface layer (approx. 9 m) of the Bellingshausen Sea and the Bransfield Strait in March 1987, and concentrated with a 26 μm-mesh net. Bulk microplanktonic settling volumes were assessed, silicoflagellates and large thecate dinoflagellates were counted, and tintinnids were counted and identified to species. Average (and maximum) values for the entire area surveyed were as follows, settling volume: 6.7 (43.3) ml/m3; silicoflagellates: 674 (7777) ind./l, 0.57 (6.54) mg C/m3; dinoflagellates: 109 (1321) ind./l, 1.40 (16.98) mg C/m3; tintinnids: 52 (589) ind./l, 1.15 (9.87) mg C/m3. The three geographic zones defined objectively on the basis of tintinnid specific assemblages also differed sharply in their surface salinity, overall microplanktonic abundance and bulk settling volume. The Bransfield Strait, with lowest settling volume values (2.1 ml/m3) and cell concentrations, was characterized by the dominance of Cymatocylis affinis/convallaria. In waters around the tip of the Antarctic Peninsula microplanktonic settling volumes averaged 4.6 ml/m3, cell concentrations were intermediate, and 79% of the tintinnids were represented by Codonellopsis balechi. The Bellingshausen Sea was characterized by the lowest salinities and the highest settling volumes (8.7 ml/m3) and cell counts; Laackmanniella spp. and Cymatocylis drygalskii, f. typica dominated this area. Almost all biological variables were significantly intercorrelated, and showed strong and mostly significant negative correlations with surface salinity, yet relationships between enhanced standing stock and ice meltwater were not obvious; rather, highest microplanktonic concentrations seemed to be due to ice-associated growth. Extremely high spatial correlations were found between the tintinnids and the dinoflagellates (r2: 0.941), suggesting the existence of close links between these two groups. Tintinnid species-specific assemblages show a coherent distributional pattern and well defined environment-related trends; most clearly differentiated preferences are exhibited by Laackmanniella prolongata (closely associated with ice-covered areas), Cymatocylis affinis/convallaria (oligotrophic open-ocean waters), and Codonellopsis balechi (coastal regions). © 1991 Springer-Verlag.
author Alder, Viviana A.
Boltovskoy, Demetrio
spellingShingle Alder, Viviana A.
Boltovskoy, Demetrio
Microplanktonic distributional patterns west of the Antarctic Peninsula, with special emphasis on the Tintinnids
author_facet Alder, Viviana A.
Boltovskoy, Demetrio
author_sort Alder, Viviana A.
title Microplanktonic distributional patterns west of the Antarctic Peninsula, with special emphasis on the Tintinnids
title_short Microplanktonic distributional patterns west of the Antarctic Peninsula, with special emphasis on the Tintinnids
title_full Microplanktonic distributional patterns west of the Antarctic Peninsula, with special emphasis on the Tintinnids
title_fullStr Microplanktonic distributional patterns west of the Antarctic Peninsula, with special emphasis on the Tintinnids
title_full_unstemmed Microplanktonic distributional patterns west of the Antarctic Peninsula, with special emphasis on the Tintinnids
title_sort microplanktonic distributional patterns west of the antarctic peninsula, with special emphasis on the tintinnids
publishDate 1991
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07224060_v11_n2_p103_Alder
http://hdl.handle.net/20.500.12110/paper_07224060_v11_n2_p103_Alder
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AT boltovskoydemetrio microplanktonicdistributionalpatternswestoftheantarcticpeninsulawithspecialemphasisonthetintinnids
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