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Abstract:

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.

Registro:

Documento: Artículo
Título:Tintinnids (Ciliophora) and other net microzooplankton (> 30um) in south-western Atlantic shelf break waters
Autor:Thompson, G.A.; Alder, V.A.; Boltovskoy, D.
Filiación:Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Avda. Rivadavia 1917, C1033AAJ Buenos Aires, Argentina
Instituto Antártico Argentino, Cerrito 1248, C1010AAZ Buenos Aires, Argentina
Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Av. Angel Gallardo 470, C1405DJR Buenos Aires, Argentina
Palabras clave: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
Año:2001
Volumen:22
Número:4
Página de inicio:343
Página de fin:355
DOI: http://dx.doi.org/10.1046/j.1439-0485.2001.01723.x
Título revista:Marine Ecology
Título revista abreviado:Mar. Ecol.
ISSN:01739565
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01739565_v22_n4_p343_Thompson

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Citas:

---------- APA ----------
Thompson, G.A., Alder, V.A. & Boltovskoy, D. (2001) . Tintinnids (Ciliophora) and other net microzooplankton (> 30um) in south-western Atlantic shelf break waters. Marine Ecology, 22(4), 343-355.
http://dx.doi.org/10.1046/j.1439-0485.2001.01723.x
---------- CHICAGO ----------
Thompson, G.A., Alder, V.A., Boltovskoy, D. "Tintinnids (Ciliophora) and other net microzooplankton (> 30um) in south-western Atlantic shelf break waters" . Marine Ecology 22, no. 4 (2001) : 343-355.
http://dx.doi.org/10.1046/j.1439-0485.2001.01723.x
---------- MLA ----------
Thompson, G.A., Alder, V.A., Boltovskoy, D. "Tintinnids (Ciliophora) and other net microzooplankton (> 30um) in south-western Atlantic shelf break waters" . Marine Ecology, vol. 22, no. 4, 2001, pp. 343-355.
http://dx.doi.org/10.1046/j.1439-0485.2001.01723.x
---------- VANCOUVER ----------
Thompson, G.A., Alder, V.A., Boltovskoy, D. Tintinnids (Ciliophora) and other net microzooplankton (> 30um) in south-western Atlantic shelf break waters. Mar. Ecol. 2001;22(4):343-355.
http://dx.doi.org/10.1046/j.1439-0485.2001.01723.x