Polycystine radiolaria of the California Current region: Seasonal and geographic patterns

Analysis of the 155 radiolarian taxa recorded in 48 plankton samples collected by means of 0-100 m tows between January and November 1972 in the California Current region revealed three faunal zones. The northernmost of these was dominated by Subarctic-transitional species; the central, which was co...

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Autor principal: Boltovskoy, Demetrio
Publicado: 1987
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03778398_v12_nC_p65_Boltovskoy
http://hdl.handle.net/20.500.12110/paper_03778398_v12_nC_p65_Boltovskoy
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_03778398_v12_nC_p65_Boltovskoy
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spelling paper:paper_03778398_v12_nC_p65_Boltovskoy2023-06-08T15:39:01Z Polycystine radiolaria of the California Current region: Seasonal and geographic patterns Boltovskoy, Demetrio Analysis of the 155 radiolarian taxa recorded in 48 plankton samples collected by means of 0-100 m tows between January and November 1972 in the California Current region revealed three faunal zones. The northernmost of these was dominated by Subarctic-transitional species; the central, which was comprised of three closely related subgroups, by intermediate-transitional taxa; and the southernmost by warm-transitional radiolarians. Of the taxa present in >5 samples, 47 - distributed among 12 species groups - plus 7 isolated species, showed significantly (p<0.05) higher abundances in either one of the areas defined. Four additional groups and several species were considerably more abundant and frequent in some areas than in others, but the corresponding differences were statistically non-significant. Some species (i.e., Acrosphaera murrayana, Spongocore cylindrica, Pseudocubus obeliscus, Trisulcus triacanthus, Botryostrobus auritus/australis, Spirocyrtis scalaris/cornutella, and Botryopyle dictyocephalus) were found to be associated with the coldest of the areas defined, rather than with the waters with highest tropical-equatorial influence, as would have been expected on the basis of previous studies. Comparison of our results with similar studies based on sedimentary materials showed some conspicuous differences, suggesting that sediments yield radiolarian assemblages with higher proportions of cold-water forms, presumably advected via subsurface currents. The cold-transitional assemblage had the lowest specific diversity and the highest dominance of a few abundant species over the rest; the intermediate-transitional showed highest diversities; and the warm-transitional lowest dominance. Indirect evidences suggest that the assemblages recorded are representative of normal, non-El Niño conditions. © 1987. Fil:Boltovskoy, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1987 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03778398_v12_nC_p65_Boltovskoy http://hdl.handle.net/20.500.12110/paper_03778398_v12_nC_p65_Boltovskoy
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Analysis of the 155 radiolarian taxa recorded in 48 plankton samples collected by means of 0-100 m tows between January and November 1972 in the California Current region revealed three faunal zones. The northernmost of these was dominated by Subarctic-transitional species; the central, which was comprised of three closely related subgroups, by intermediate-transitional taxa; and the southernmost by warm-transitional radiolarians. Of the taxa present in >5 samples, 47 - distributed among 12 species groups - plus 7 isolated species, showed significantly (p<0.05) higher abundances in either one of the areas defined. Four additional groups and several species were considerably more abundant and frequent in some areas than in others, but the corresponding differences were statistically non-significant. Some species (i.e., Acrosphaera murrayana, Spongocore cylindrica, Pseudocubus obeliscus, Trisulcus triacanthus, Botryostrobus auritus/australis, Spirocyrtis scalaris/cornutella, and Botryopyle dictyocephalus) were found to be associated with the coldest of the areas defined, rather than with the waters with highest tropical-equatorial influence, as would have been expected on the basis of previous studies. Comparison of our results with similar studies based on sedimentary materials showed some conspicuous differences, suggesting that sediments yield radiolarian assemblages with higher proportions of cold-water forms, presumably advected via subsurface currents. The cold-transitional assemblage had the lowest specific diversity and the highest dominance of a few abundant species over the rest; the intermediate-transitional showed highest diversities; and the warm-transitional lowest dominance. Indirect evidences suggest that the assemblages recorded are representative of normal, non-El Niño conditions. © 1987.
author Boltovskoy, Demetrio
spellingShingle Boltovskoy, Demetrio
Polycystine radiolaria of the California Current region: Seasonal and geographic patterns
author_facet Boltovskoy, Demetrio
author_sort Boltovskoy, Demetrio
title Polycystine radiolaria of the California Current region: Seasonal and geographic patterns
title_short Polycystine radiolaria of the California Current region: Seasonal and geographic patterns
title_full Polycystine radiolaria of the California Current region: Seasonal and geographic patterns
title_fullStr Polycystine radiolaria of the California Current region: Seasonal and geographic patterns
title_full_unstemmed Polycystine radiolaria of the California Current region: Seasonal and geographic patterns
title_sort polycystine radiolaria of the california current region: seasonal and geographic patterns
publishDate 1987
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03778398_v12_nC_p65_Boltovskoy
http://hdl.handle.net/20.500.12110/paper_03778398_v12_nC_p65_Boltovskoy
work_keys_str_mv AT boltovskoydemetrio polycystineradiolariaofthecaliforniacurrentregionseasonalandgeographicpatterns
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