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This is the first study on diatom spatial patterns in relation to major oceanographic features along a megascale transect in the Southwestern Atlantic Ocean and provides a comparison with diatom distribution in surface sediments. Absolute abundances of diatoms, silicoflagellates and dinoflagellates (>10-μm fraction) were assessed in 80 bottle samples from 5 to 50 m, retrieved in November 1993 at 20 stations (30-61°S) along 53°W. Siliceous phytoplankton were scarce in the northern half of the transect and in the south of 57°S (100-150 cells L-1), with a strong peak in the vicinity of the Polar Front (∼200 000 cells L-1), whereas dinoflagellates were more abundant at the northern stations (up to 24 000 cells L-1). In the south of 50°S phytoplanktonic cell densities were loosely (but significantly, r = 0.54, P < 0.01) associated with chlorophyll a, whereas in the north of this latitude, this relationship disappeared (r = 0.018, P > 0.1). In total, 191 diatoms and 4 silicoflagellates were recorded. Changes in diatom assemblage compositions along the transect allowed identification of five discrete areas: Subtropical (29°S), Northern Transitional (34-41°S), Southern Transitional (43-48°S), Subantarctic (49-54°S) and Antarctic (55-59°S), each characterized by a set of typical species. Diversity changed little with latitude, but numbers of species were higher in the north of 40°S. Comparison of diatom assemblage makeup in the plankton and in the surface sediments shows very strong disagreements, whereby cold water species are very significantly over-represented in the sedimentary record, suggesting enhanced preservation and strong subsurface equatorward advection of the cold water taxa. © The Author 2006. Published by Oxford University Press. All rights reserved.


Documento: Artículo
Título:Distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the Southwestern Atlantic Ocean (30-61°S)
Autor:Olguín, H.F.; Boltovskoy, D.; Lange, C.B.; Brandini, F.
Filiación:Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, C1428EHA-Buenos Aires, Argentina
Museo Argentino de Ciencias Naturales, A. Gallardo 470, C1405DJR-Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas Y Técnicas, Argentina
Departamento de Oceanografía, Centro de Investigacion Oceanografica en El Pacifico Sur-Oriental (FONDAP-COPAS), Universidad de Concepción, Casilla 160-C, Concepción, Chile
Centro de Estudos Do Mar, Universidade Federal Do Paraná, Av. Beira Mar s/n, Pontal do Sul, PR 83255-000, Brazil
Palabras clave:abundance; advection; chlorophyll; community composition; diatom; dinoflagellate; phytoplankton; surficial sediment; transect; vertical distribution; Atlantic Ocean; Atlantic Ocean (Southwest); Bacillariophyta; Dictyochophyceae; Dinophyceae
Página de inicio:1107
Página de fin:1128
Título revista:Journal of Plankton Research
Título revista abreviado:J. Plankton Res.


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---------- APA ----------
Olguín, H.F., Boltovskoy, D., Lange, C.B. & Brandini, F. (2006) . Distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the Southwestern Atlantic Ocean (30-61°S). Journal of Plankton Research, 28(12), 1107-1128.
---------- CHICAGO ----------
Olguín, H.F., Boltovskoy, D., Lange, C.B., Brandini, F. "Distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the Southwestern Atlantic Ocean (30-61°S)" . Journal of Plankton Research 28, no. 12 (2006) : 1107-1128.
---------- MLA ----------
Olguín, H.F., Boltovskoy, D., Lange, C.B., Brandini, F. "Distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the Southwestern Atlantic Ocean (30-61°S)" . Journal of Plankton Research, vol. 28, no. 12, 2006, pp. 1107-1128.
---------- VANCOUVER ----------
Olguín, H.F., Boltovskoy, D., Lange, C.B., Brandini, F. Distribution of spring phytoplankton (mainly diatoms) in the upper 50 m of the Southwestern Atlantic Ocean (30-61°S). J. Plankton Res. 2006;28(12):1107-1128.