Azadinium (Amphidomataceae, Dinophyceae) in the Southwest Atlantic: In situ and satellite observations

Azaspiracid toxins (AZAs) have been identified in marine invertebrates and are of wide geographical distribution, but have not been reported in Argentina or Uruguay. The first identified causal agent is the photosynthetic dinoflagellate Azadinium spinosum, but new studies indicate that other species...

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Autores principales:	Akselman,Rut, Negri,Rubén M, Cozzolino,Ezequiel
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2014
Materias:	Azadinium dinoflagellate blooms SW Atlantic SeaWiFS
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572014000300008
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spelling	oai:scielo:S0718-195720140003000082015-01-14Azadinium (Amphidomataceae, Dinophyceae) in the Southwest Atlantic: In situ and satellite observationsAkselman,RutNegri,Rubén MCozzolino,Ezequiel Azadinium dinoflagellate blooms SW Atlantic SeaWiFS Azaspiracid toxins (AZAs) have been identified in marine invertebrates and are of wide geographical distribution, but have not been reported in Argentina or Uruguay. The first identified causal agent is the photosynthetic dinoflagellate Azadinium spinosum, but new studies indicate that other species also synthesize AZAs. We have recently reported the presence of A. cf. spinosum in the Southwest Atlantic and the generation of two extended blooms as new global events. Here we analyze the ecological conditions of a third bloom of A. cf. spinosum and its satellite record, and report the regional distribution and temporal development of the genus Azadinium. Azadinium had a wide spatial distribution encompassing northern Argentine and southern Uruguayan shelves, including the mouth of the Río de la Plata. Abundance was generally low (<1x10³ cells L-1), and analysis conducted at a time series station showed a marked seasonality in spring and autumn. A. cf. spinosum caused a third bloom and discolorations (>10(6) cells L-1) in August-September 1998 in the northern shelf of Argentina in an area that spatially coincided with the previous episodes, with hydrographic conditions propitious for its population growth. This bloom analyzed in situ, had satellite records from the SeaWiFS sensor which indicated high concentrations of chlorophyll-a (maximum of 11.76 mg Chlo-a m-3) in a long and wide band (at least 2.5° latitude) near the continental shelf break and the Malvinas Current. It is still unknown if species of Azadinium are capable of synthesizing AZAs, a topic of interest in this region due to commercial bivalve exploitation.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.49 n.3 20142014-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572014000300008en10.4067/S0718-19572014000300008
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Azadinium dinoflagellate blooms SW Atlantic SeaWiFS
spellingShingle	Azadinium dinoflagellate blooms SW Atlantic SeaWiFS Akselman,Rut Negri,Rubén M Cozzolino,Ezequiel Azadinium (Amphidomataceae, Dinophyceae) in the Southwest Atlantic: In situ and satellite observations
description	Azaspiracid toxins (AZAs) have been identified in marine invertebrates and are of wide geographical distribution, but have not been reported in Argentina or Uruguay. The first identified causal agent is the photosynthetic dinoflagellate Azadinium spinosum, but new studies indicate that other species also synthesize AZAs. We have recently reported the presence of A. cf. spinosum in the Southwest Atlantic and the generation of two extended blooms as new global events. Here we analyze the ecological conditions of a third bloom of A. cf. spinosum and its satellite record, and report the regional distribution and temporal development of the genus Azadinium. Azadinium had a wide spatial distribution encompassing northern Argentine and southern Uruguayan shelves, including the mouth of the Río de la Plata. Abundance was generally low (<1x10³ cells L-1), and analysis conducted at a time series station showed a marked seasonality in spring and autumn. A. cf. spinosum caused a third bloom and discolorations (>10(6) cells L-1) in August-September 1998 in the northern shelf of Argentina in an area that spatially coincided with the previous episodes, with hydrographic conditions propitious for its population growth. This bloom analyzed in situ, had satellite records from the SeaWiFS sensor which indicated high concentrations of chlorophyll-a (maximum of 11.76 mg Chlo-a m-3) in a long and wide band (at least 2.5° latitude) near the continental shelf break and the Malvinas Current. It is still unknown if species of Azadinium are capable of synthesizing AZAs, a topic of interest in this region due to commercial bivalve exploitation.
author	Akselman,Rut Negri,Rubén M Cozzolino,Ezequiel
author_facet	Akselman,Rut Negri,Rubén M Cozzolino,Ezequiel
author_sort	Akselman,Rut
title	Azadinium (Amphidomataceae, Dinophyceae) in the Southwest Atlantic: In situ and satellite observations
title_short	Azadinium (Amphidomataceae, Dinophyceae) in the Southwest Atlantic: In situ and satellite observations
title_full	Azadinium (Amphidomataceae, Dinophyceae) in the Southwest Atlantic: In situ and satellite observations
title_fullStr	Azadinium (Amphidomataceae, Dinophyceae) in the Southwest Atlantic: In situ and satellite observations
title_full_unstemmed	Azadinium (Amphidomataceae, Dinophyceae) in the Southwest Atlantic: In situ and satellite observations
title_sort	azadinium (amphidomataceae, dinophyceae) in the southwest atlantic: in situ and satellite observations
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572014000300008
work_keys_str_mv	AT akselmanrut azadiniumamphidomataceaedinophyceaeinthesouthwestatlanticinsituandsatelliteobservations AT negrirubenm azadiniumamphidomataceaedinophyceaeinthesouthwestatlanticinsituandsatelliteobservations AT cozzolinoezequiel azadiniumamphidomataceaedinophyceaeinthesouthwestatlanticinsituandsatelliteobservations
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Azadinium (Amphidomataceae, Dinophyceae) in the Southwest Atlantic: In situ and satellite observations

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