Extraordinary bloom of toxin-producing phytoplankton enhanced by strong retention on the offshore Patagonian shelf

Autores: Guinder, Valeria Ana; Tillmann, Urban; Rivarossa, Martin Javier; Ferronato, Carola; Ramírez, Fernando Javier; Krock, Bernd; Gu, Haifeng; Saraceno, Martin
Año de publicación: 2025
Idioma: inglés
Tipo de recurso: artículo
Estado: versión publicada
Descripción: The extensive Patagonian continental shelf in the Atlantic Ocean is renowned for its high productivity associated with nutrient-rich waters that fertilize massive phytoplankton blooms, especially along the shelf-break frontal system. Growing evidence reflects this ecosystem as a hotspot for harmful algal blooms (HABs). Whether these HABs reach coastal areas or are exported to the adjacent ocean basin by energetic edge currents remains unexplored. During two oceanographic cruises in spring 2021, a bloom of dinoflagellates of the Amphidomataceae family was sampled over the outer shelf with a 10 d interval, at stations 40 km apart. The bloom was first sampled on 16 November, with 32 ×106 cells L−1, and was still persistent on 25 November, with 14 ×106 cells L−1. The magnitude of this bloom is a global record for this group so far reported in the literature. The toxin azaspiracid-2 (AZA-2) was detected in both stages of the bloom, with values up to 2122 pg L−1. The most likely source of AZA-2 was Azadinium spinosum ribotype B. The bloom developed in vertically stable waters (60 m mixed layer depth) with elevated chlorophyll concentration. Water retention and the presence of fronts induced by horizontal stirring controlled the persistence and trajectory of the bloom in a localized area over the continental shelf, as evidenced by analysis of geostrophic surface currents, Lyapunov coefficients, and particle advection modelling. These findings underscore the importance of monitoring HABs in offshore environments and the need to understand biophysical interactions that govern bloom taxa assemblages and transport pathways.
Fil: Guinder, Valeria Ana. 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: Tillmann, Urban. Alfred-Wegener-Institut. Helmholtz-Zentrum für Polar und Meeresforschung; Alemania
Fil: Rivarossa, Martin Javier. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Ferronato, Carola. 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: Ramírez, Fernando Javier. 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: Krock, Bernd. Alfred-Wegener-Institut. Helmholtz-Zentrum für Polar und Meeresforschung; Alemania
Fil: Gu, Haifeng. Third Institute Of Oceanography; China
Fil: Saraceno, Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; Argentina
Materia: Phytoplankton bloom
Bio-phydical drivers
Mesoscale Eddy
Patagonian continental Shelf, SW Atlantic
Nivel de accesibilidad: acceso abierto
Condiciones de uso: https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
Institución: Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador: oai:ri.conicet.gov.ar:11336/267722

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spelling	Extraordinary bloom of toxin-producing phytoplankton enhanced by strong retention on the offshore Patagonian shelfGuinder, Valeria AnaTillmann, UrbanRivarossa, Martin JavierFerronato, CarolaRamírez, Fernando JavierKrock, BerndGu, HaifengSaraceno, MartinPhytoplankton bloomBio-phydical driversMesoscale EddyPatagonian continental Shelf, SW Atlantichttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The extensive Patagonian continental shelf in the Atlantic Ocean is renowned for its high productivity associated with nutrient-rich waters that fertilize massive phytoplankton blooms, especially along the shelf-break frontal system. Growing evidence reflects this ecosystem as a hotspot for harmful algal blooms (HABs). Whether these HABs reach coastal areas or are exported to the adjacent ocean basin by energetic edge currents remains unexplored. During two oceanographic cruises in spring 2021, a bloom of dinoflagellates of the Amphidomataceae family was sampled over the outer shelf with a 10 d interval, at stations 40 km apart. The bloom was first sampled on 16 November, with 32 ×106 cells L−1, and was still persistent on 25 November, with 14 ×106 cells L−1. The magnitude of this bloom is a global record for this group so far reported in the literature. The toxin azaspiracid-2 (AZA-2) was detected in both stages of the bloom, with values up to 2122 pg L−1. The most likely source of AZA-2 was Azadinium spinosum ribotype B. The bloom developed in vertically stable waters (60 m mixed layer depth) with elevated chlorophyll concentration. Water retention and the presence of fronts induced by horizontal stirring controlled the persistence and trajectory of the bloom in a localized area over the continental shelf, as evidenced by analysis of geostrophic surface currents, Lyapunov coefficients, and particle advection modelling. These findings underscore the importance of monitoring HABs in offshore environments and the need to understand biophysical interactions that govern bloom taxa assemblages and transport pathways.Fil: Guinder, Valeria Ana. 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; ArgentinaFil: Tillmann, Urban. Alfred-Wegener-Institut. Helmholtz-Zentrum für Polar und Meeresforschung; AlemaniaFil: Rivarossa, Martin Javier. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Ferronato, Carola. 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; ArgentinaFil: Ramírez, Fernando Javier. 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; ArgentinaFil: Krock, Bernd. Alfred-Wegener-Institut. Helmholtz-Zentrum für Polar und Meeresforschung; AlemaniaFil: Gu, Haifeng. Third Institute Of Oceanography; ChinaFil: Saraceno, Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; ArgentinaWiley2025-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/267722Guinder, Valeria Ana; Tillmann, Urban; Rivarossa, Martin Javier; Ferronato, Carola; Ramírez, Fernando Javier; et al.; Extraordinary bloom of toxin-producing phytoplankton enhanced by strong retention on the offshore Patagonian shelf; Wiley; Biogeosciences; 22; 13; 7-2025; 3397-34281726-4189CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.5194/bg-22-3397-2025info:eu-repo/semantics/altIdentifier/url/https://bg.copernicus.org/articles/22/3397/2025/info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:56:10Zoai:ri.conicet.gov.ar:11336/267722instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-22 11:56:10.312CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv	Extraordinary bloom of toxin-producing phytoplankton enhanced by strong retention on the offshore Patagonian shelf
title	Extraordinary bloom of toxin-producing phytoplankton enhanced by strong retention on the offshore Patagonian shelf
spellingShingle	Extraordinary bloom of toxin-producing phytoplankton enhanced by strong retention on the offshore Patagonian shelf Guinder, Valeria Ana Phytoplankton bloom Bio-phydical drivers Mesoscale Eddy Patagonian continental Shelf, SW Atlantic
title_short	Extraordinary bloom of toxin-producing phytoplankton enhanced by strong retention on the offshore Patagonian shelf
title_full	Extraordinary bloom of toxin-producing phytoplankton enhanced by strong retention on the offshore Patagonian shelf
title_fullStr	Extraordinary bloom of toxin-producing phytoplankton enhanced by strong retention on the offshore Patagonian shelf
title_full_unstemmed	Extraordinary bloom of toxin-producing phytoplankton enhanced by strong retention on the offshore Patagonian shelf
title_sort	Extraordinary bloom of toxin-producing phytoplankton enhanced by strong retention on the offshore Patagonian shelf
dc.creator.none.fl_str_mv	Guinder, Valeria Ana Tillmann, Urban Rivarossa, Martin Javier Ferronato, Carola Ramírez, Fernando Javier Krock, Bernd Gu, Haifeng Saraceno, Martin
author	Guinder, Valeria Ana
author_facet	Guinder, Valeria Ana Tillmann, Urban Rivarossa, Martin Javier Ferronato, Carola Ramírez, Fernando Javier Krock, Bernd Gu, Haifeng Saraceno, Martin
author_role	author
author2	Tillmann, Urban Rivarossa, Martin Javier Ferronato, Carola Ramírez, Fernando Javier Krock, Bernd Gu, Haifeng Saraceno, Martin
author2_role	author author author author author author author
dc.subject.none.fl_str_mv	Phytoplankton bloom Bio-phydical drivers Mesoscale Eddy Patagonian continental Shelf, SW Atlantic
topic	Phytoplankton bloom Bio-phydical drivers Mesoscale Eddy Patagonian continental Shelf, SW Atlantic
purl_subject.fl_str_mv	https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv	The extensive Patagonian continental shelf in the Atlantic Ocean is renowned for its high productivity associated with nutrient-rich waters that fertilize massive phytoplankton blooms, especially along the shelf-break frontal system. Growing evidence reflects this ecosystem as a hotspot for harmful algal blooms (HABs). Whether these HABs reach coastal areas or are exported to the adjacent ocean basin by energetic edge currents remains unexplored. During two oceanographic cruises in spring 2021, a bloom of dinoflagellates of the Amphidomataceae family was sampled over the outer shelf with a 10 d interval, at stations 40 km apart. The bloom was first sampled on 16 November, with 32 ×106 cells L−1, and was still persistent on 25 November, with 14 ×106 cells L−1. The magnitude of this bloom is a global record for this group so far reported in the literature. The toxin azaspiracid-2 (AZA-2) was detected in both stages of the bloom, with values up to 2122 pg L−1. The most likely source of AZA-2 was Azadinium spinosum ribotype B. The bloom developed in vertically stable waters (60 m mixed layer depth) with elevated chlorophyll concentration. Water retention and the presence of fronts induced by horizontal stirring controlled the persistence and trajectory of the bloom in a localized area over the continental shelf, as evidenced by analysis of geostrophic surface currents, Lyapunov coefficients, and particle advection modelling. These findings underscore the importance of monitoring HABs in offshore environments and the need to understand biophysical interactions that govern bloom taxa assemblages and transport pathways. Fil: Guinder, Valeria Ana. 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: Tillmann, Urban. Alfred-Wegener-Institut. Helmholtz-Zentrum für Polar und Meeresforschung; Alemania Fil: Rivarossa, Martin Javier. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Ferronato, Carola. 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: Ramírez, Fernando Javier. 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: Krock, Bernd. Alfred-Wegener-Institut. Helmholtz-Zentrum für Polar und Meeresforschung; Alemania Fil: Gu, Haifeng. Third Institute Of Oceanography; China Fil: Saraceno, Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; Argentina
description	The extensive Patagonian continental shelf in the Atlantic Ocean is renowned for its high productivity associated with nutrient-rich waters that fertilize massive phytoplankton blooms, especially along the shelf-break frontal system. Growing evidence reflects this ecosystem as a hotspot for harmful algal blooms (HABs). Whether these HABs reach coastal areas or are exported to the adjacent ocean basin by energetic edge currents remains unexplored. During two oceanographic cruises in spring 2021, a bloom of dinoflagellates of the Amphidomataceae family was sampled over the outer shelf with a 10 d interval, at stations 40 km apart. The bloom was first sampled on 16 November, with 32 ×106 cells L−1, and was still persistent on 25 November, with 14 ×106 cells L−1. The magnitude of this bloom is a global record for this group so far reported in the literature. The toxin azaspiracid-2 (AZA-2) was detected in both stages of the bloom, with values up to 2122 pg L−1. The most likely source of AZA-2 was Azadinium spinosum ribotype B. The bloom developed in vertically stable waters (60 m mixed layer depth) with elevated chlorophyll concentration. Water retention and the presence of fronts induced by horizontal stirring controlled the persistence and trajectory of the bloom in a localized area over the continental shelf, as evidenced by analysis of geostrophic surface currents, Lyapunov coefficients, and particle advection modelling. These findings underscore the importance of monitoring HABs in offshore environments and the need to understand biophysical interactions that govern bloom taxa assemblages and transport pathways.
publishDate	2025
dc.date.none.fl_str_mv	2025-07
dc.type.none.fl_str_mv	info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo
format	article
status_str	publishedVersion
dc.identifier.none.fl_str_mv	http://hdl.handle.net/11336/267722 Guinder, Valeria Ana; Tillmann, Urban; Rivarossa, Martin Javier; Ferronato, Carola; Ramírez, Fernando Javier; et al.; Extraordinary bloom of toxin-producing phytoplankton enhanced by strong retention on the offshore Patagonian shelf; Wiley; Biogeosciences; 22; 13; 7-2025; 3397-3428 1726-4189 CONICET Digital CONICET
url	http://hdl.handle.net/11336/267722
identifier_str_mv	Guinder, Valeria Ana; Tillmann, Urban; Rivarossa, Martin Javier; Ferronato, Carola; Ramírez, Fernando Javier; et al.; Extraordinary bloom of toxin-producing phytoplankton enhanced by strong retention on the offshore Patagonian shelf; Wiley; Biogeosciences; 22; 13; 7-2025; 3397-3428 1726-4189 CONICET Digital CONICET
dc.language.none.fl_str_mv	eng
language	eng
dc.relation.none.fl_str_mv	info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-22-3397-2025 info:eu-repo/semantics/altIdentifier/url/https://bg.copernicus.org/articles/22/3397/2025/
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dc.publisher.none.fl_str_mv	Wiley
publisher.none.fl_str_mv	Wiley
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Extraordinary bloom of toxin-producing phytoplankton enhanced by strong retention on the offshore Patagonian shelf

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