Hydrographic conditions and cyst beds in the San Jorge Gulf, Argentina, favour dinoflagellate blooms including toxigenic species and their toxins

Authors
Krock, Bernd; Borel, Claudia Marcela; Barrera, Facundo Matías; Tillman, Urban; Fabro Cerreia Fus, Elena Ines; Almandoz, Gaston Osvaldo; Ferrario, Martha Elba; Garzon Cardona, John Edison; Koch, Boris Peter; Alonso, Cecilia; Lara, Ruben Jose
Publication Year
2015
Language
English
Format
article
Status
Published version
Description
The overlay of cooler nutrient enriched Beagle–Magellan water with warmer nutrient depleted shelf water and a strong stratification of the water column in the San Jorge Gulf region, Argentina, coincided with relatively high dinoflagellate abundances in April 2012, up to 34,000 cells L− 1. This dinoflagellate proliferation was dominated by Ceratium spp., but environmental conditions also favored to a lesser amount the occurrence of toxigenic dinoflagellates, such as Alexandrium tamarense and Protoceratium reticulatum, whose toxins were hardly detected in any other areas along the expedition transect of the R/V Puerto Deseado between 38 and 56°S (Ushuaia–Mar del Plata) in March/April 2012. Generally vegetative cells of A. tamarense and P. reticulatum co-occurred with their respective phycotoxins in the water column and their cysts in the upper sediment layers. Two strains of A. tamarense were isolated from the bloom sample and morphologically characterized. Their PSP toxin profiles consisted of C1/2, gonyautoxins 1/4 and to a lesser amount of neosaxitoxin and confirmed earlier data from this region. The ratios between autotrophic picoplankton and heterotrophic bacteria were higher in shelf waters in the north than in Beagle–Magellan waters in the south of San Jorge Gulf.
Fil: Krock, Bernd. Alfred Wegener Institute; Alemania
Fil: Borel, Claudia Marcela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Barrera, Facundo Matías. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; Argentina
Fil: Tillman, Urban. Alfred Wegener Institute; Alemania
Fil: Fabro Cerreia Fus, Elena Ines. Universidad Nacional de la Plata; Argentina
Fil: Almandoz, Gaston Osvaldo. Universidad Nacional de la Plata; Argentina
Fil: Ferrario, Martha Elba. Universidad Nacional de la Plata; Argentina
Fil: Garzon Cardona, John Edison. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; Argentina
Fil: Koch, Boris Peter. Alfred Wegener Institute; Alemania. University of Applied Sciences; Alemania
Fil: Alonso, Cecilia. Universidad de la Republica. Centro de Estudios Interdiciplinarios Uruguayos; Uruguay
Fil: Lara, Ruben Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; Argentina
Subject
COLD WATER MASSES
SOUTHWEST ATLANTIC
PLANKTONIC COMMUNITY
TOXINS
DINOFLAGELLATE BLOOMS
Alexandrium tamarense
Protoceratium reticulatum
Oceanografía, Hidrología, Recursos Hídricos
Ciencias de la Tierra y relacionadas con el Medio Ambiente
CIENCIAS NATURALES Y EXACTAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/16633