Distribution of organic-walled dinoflagellate cysts in surface sediments of San Matías Gulf (North Patagonian Shelf, Argentina): a seed bank for potential harmful algal blooms

Autores
Xillovich, Juan Bautista; Borel, Claudia Marcela; Ferronato, Carola; Krock, Bernd
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
In the southwestern Atlantic Ocean, the San Matías Gulf (SMG) is a semi-enclosed coastal ecosystem (40.5°-42.5°S; 63.5°-65.5°W) with considerably greater depths (up to 190 m) than the adjacent continental shelf (~70 m). A thermohaline frontal system develops in a latitudinal position around 41.8°S from spring to summer leading to high biological productivity in this relevant area for fisheries. In this study, twelve surface sediment samples from the SMG were analyzed for the determination of species and distribution of organic-walled dinoflagellate cysts (dinocysts) in relation to physico-chemical conditions (grain-size of sediments, water column stability, spring sea-surface temperature, salinity, and nitrate concentration). Thirty different taxa of dinocysts were recorded, of which twenty-eight were identified to species level. The strong dominance of Operculodinium centrocarpum (cyst of Protoceratium reticulatum, a yessotoxin producer in the Argentine Sea) accompanied by minor abundances of other phototrophic and heterotrophic taxa characterized all assemblages. Cysts of Alexandrium catenella, which is known as a saxitoxin-producing species in the gulf, were also recorded across sites. The highest absolute abundances of dinocysts occurred at the inner gulf, north of the latitudinal front. For this area we argue that multi-year fluxes of phototrophic dinocysts to the silty bottom are enhanced by the great production of vegetative cells in the seasonally stratified water column, the encystment strategies of the dominant species and the particular physical oceanographic characteristics. Although densities of both phototrophic and heterotrophic cysts were lower in the coarser sediments near the mouth of the gulf, the relative abundances of heterotrophic cysts were higher. The preference of heterotrophic species reflects higher nitrate concentrations, which increase the primary production and thus food availability for heterotrophs.
Fil: Xillovich, Juan Bautista. 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: 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: 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: Krock, Bernd. Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung; Alemania
Materia
southwestern Atlantic Ocean
dinocysts
toxic
surface sediments
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/279823
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/279823
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Distribution of organic-walled dinoflagellate cysts in surface sediments of San Matías Gulf (North Patagonian Shelf, Argentina): a seed bank for potential harmful algal bloomsXillovich, Juan BautistaBorel, Claudia MarcelaFerronato, CarolaKrock, Berndsouthwestern Atlantic Oceandinocyststoxicsurface sedimentshttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1In the southwestern Atlantic Ocean, the San Matías Gulf (SMG) is a semi-enclosed coastal ecosystem (40.5°-42.5°S; 63.5°-65.5°W) with considerably greater depths (up to 190 m) than the adjacent continental shelf (~70 m). A thermohaline frontal system develops in a latitudinal position around 41.8°S from spring to summer leading to high biological productivity in this relevant area for fisheries. In this study, twelve surface sediment samples from the SMG were analyzed for the determination of species and distribution of organic-walled dinoflagellate cysts (dinocysts) in relation to physico-chemical conditions (grain-size of sediments, water column stability, spring sea-surface temperature, salinity, and nitrate concentration). Thirty different taxa of dinocysts were recorded, of which twenty-eight were identified to species level. The strong dominance of Operculodinium centrocarpum (cyst of Protoceratium reticulatum, a yessotoxin producer in the Argentine Sea) accompanied by minor abundances of other phototrophic and heterotrophic taxa characterized all assemblages. Cysts of Alexandrium catenella, which is known as a saxitoxin-producing species in the gulf, were also recorded across sites. The highest absolute abundances of dinocysts occurred at the inner gulf, north of the latitudinal front. For this area we argue that multi-year fluxes of phototrophic dinocysts to the silty bottom are enhanced by the great production of vegetative cells in the seasonally stratified water column, the encystment strategies of the dominant species and the particular physical oceanographic characteristics. Although densities of both phototrophic and heterotrophic cysts were lower in the coarser sediments near the mouth of the gulf, the relative abundances of heterotrophic cysts were higher. The preference of heterotrophic species reflects higher nitrate concentrations, which increase the primary production and thus food availability for heterotrophs.Fil: Xillovich, Juan Bautista. 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; ArgentinaFil: 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; 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: Krock, Bernd. Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung; AlemaniaFrontiers Media2025-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/279823Xillovich, Juan Bautista; Borel, Claudia Marcela; Ferronato, Carola; Krock, Bernd; Distribution of organic-walled dinoflagellate cysts in surface sediments of San Matías Gulf (North Patagonian Shelf, Argentina): a seed bank for potential harmful algal blooms; Frontiers Media; Frontiers In Marine Science; 12; 6-2025; 1-212296-7745CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.frontiersin.org/articles/10.3389/fmars.2025.1543414/fullinfo:eu-repo/semantics/altIdentifier/doi/10.3389/fmars.2025.1543414info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-02-26T10:03:20Zoai:ri.conicet.gov.ar:11336/279823instacron: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:34982026-02-26 10:03:20.487CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Distribution of organic-walled dinoflagellate cysts in surface sediments of San Matías Gulf (North Patagonian Shelf, Argentina): a seed bank for potential harmful algal blooms
title Distribution of organic-walled dinoflagellate cysts in surface sediments of San Matías Gulf (North Patagonian Shelf, Argentina): a seed bank for potential harmful algal blooms
spellingShingle Distribution of organic-walled dinoflagellate cysts in surface sediments of San Matías Gulf (North Patagonian Shelf, Argentina): a seed bank for potential harmful algal blooms
Xillovich, Juan Bautista
southwestern Atlantic Ocean
dinocysts
toxic
surface sediments
title_short Distribution of organic-walled dinoflagellate cysts in surface sediments of San Matías Gulf (North Patagonian Shelf, Argentina): a seed bank for potential harmful algal blooms
title_full Distribution of organic-walled dinoflagellate cysts in surface sediments of San Matías Gulf (North Patagonian Shelf, Argentina): a seed bank for potential harmful algal blooms
title_fullStr Distribution of organic-walled dinoflagellate cysts in surface sediments of San Matías Gulf (North Patagonian Shelf, Argentina): a seed bank for potential harmful algal blooms
title_full_unstemmed Distribution of organic-walled dinoflagellate cysts in surface sediments of San Matías Gulf (North Patagonian Shelf, Argentina): a seed bank for potential harmful algal blooms
title_sort Distribution of organic-walled dinoflagellate cysts in surface sediments of San Matías Gulf (North Patagonian Shelf, Argentina): a seed bank for potential harmful algal blooms
dc.creator.none.fl_str_mv Xillovich, Juan Bautista
Borel, Claudia Marcela
Ferronato, Carola
Krock, Bernd
author Xillovich, Juan Bautista
author_facet Xillovich, Juan Bautista
Borel, Claudia Marcela
Ferronato, Carola
Krock, Bernd
author_role author
author2 Borel, Claudia Marcela
Ferronato, Carola
Krock, Bernd
author2_role author
author
author
dc.subject.none.fl_str_mv southwestern Atlantic Ocean
dinocysts
toxic
surface sediments
topic southwestern Atlantic Ocean
dinocysts
toxic
surface sediments
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv In the southwestern Atlantic Ocean, the San Matías Gulf (SMG) is a semi-enclosed coastal ecosystem (40.5°-42.5°S; 63.5°-65.5°W) with considerably greater depths (up to 190 m) than the adjacent continental shelf (~70 m). A thermohaline frontal system develops in a latitudinal position around 41.8°S from spring to summer leading to high biological productivity in this relevant area for fisheries. In this study, twelve surface sediment samples from the SMG were analyzed for the determination of species and distribution of organic-walled dinoflagellate cysts (dinocysts) in relation to physico-chemical conditions (grain-size of sediments, water column stability, spring sea-surface temperature, salinity, and nitrate concentration). Thirty different taxa of dinocysts were recorded, of which twenty-eight were identified to species level. The strong dominance of Operculodinium centrocarpum (cyst of Protoceratium reticulatum, a yessotoxin producer in the Argentine Sea) accompanied by minor abundances of other phototrophic and heterotrophic taxa characterized all assemblages. Cysts of Alexandrium catenella, which is known as a saxitoxin-producing species in the gulf, were also recorded across sites. The highest absolute abundances of dinocysts occurred at the inner gulf, north of the latitudinal front. For this area we argue that multi-year fluxes of phototrophic dinocysts to the silty bottom are enhanced by the great production of vegetative cells in the seasonally stratified water column, the encystment strategies of the dominant species and the particular physical oceanographic characteristics. Although densities of both phototrophic and heterotrophic cysts were lower in the coarser sediments near the mouth of the gulf, the relative abundances of heterotrophic cysts were higher. The preference of heterotrophic species reflects higher nitrate concentrations, which increase the primary production and thus food availability for heterotrophs.
Fil: Xillovich, Juan Bautista. 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: 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: 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: Krock, Bernd. Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung; Alemania
description In the southwestern Atlantic Ocean, the San Matías Gulf (SMG) is a semi-enclosed coastal ecosystem (40.5°-42.5°S; 63.5°-65.5°W) with considerably greater depths (up to 190 m) than the adjacent continental shelf (~70 m). A thermohaline frontal system develops in a latitudinal position around 41.8°S from spring to summer leading to high biological productivity in this relevant area for fisheries. In this study, twelve surface sediment samples from the SMG were analyzed for the determination of species and distribution of organic-walled dinoflagellate cysts (dinocysts) in relation to physico-chemical conditions (grain-size of sediments, water column stability, spring sea-surface temperature, salinity, and nitrate concentration). Thirty different taxa of dinocysts were recorded, of which twenty-eight were identified to species level. The strong dominance of Operculodinium centrocarpum (cyst of Protoceratium reticulatum, a yessotoxin producer in the Argentine Sea) accompanied by minor abundances of other phototrophic and heterotrophic taxa characterized all assemblages. Cysts of Alexandrium catenella, which is known as a saxitoxin-producing species in the gulf, were also recorded across sites. The highest absolute abundances of dinocysts occurred at the inner gulf, north of the latitudinal front. For this area we argue that multi-year fluxes of phototrophic dinocysts to the silty bottom are enhanced by the great production of vegetative cells in the seasonally stratified water column, the encystment strategies of the dominant species and the particular physical oceanographic characteristics. Although densities of both phototrophic and heterotrophic cysts were lower in the coarser sediments near the mouth of the gulf, the relative abundances of heterotrophic cysts were higher. The preference of heterotrophic species reflects higher nitrate concentrations, which increase the primary production and thus food availability for heterotrophs.
publishDate 2025
dc.date.none.fl_str_mv 2025-06
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/11336/279823
Xillovich, Juan Bautista; Borel, Claudia Marcela; Ferronato, Carola; Krock, Bernd; Distribution of organic-walled dinoflagellate cysts in surface sediments of San Matías Gulf (North Patagonian Shelf, Argentina): a seed bank for potential harmful algal blooms; Frontiers Media; Frontiers In Marine Science; 12; 6-2025; 1-21
2296-7745
CONICET Digital
CONICET
url http://hdl.handle.net/11336/279823
identifier_str_mv Xillovich, Juan Bautista; Borel, Claudia Marcela; Ferronato, Carola; Krock, Bernd; Distribution of organic-walled dinoflagellate cysts in surface sediments of San Matías Gulf (North Patagonian Shelf, Argentina): a seed bank for potential harmful algal blooms; Frontiers Media; Frontiers In Marine Science; 12; 6-2025; 1-21
2296-7745
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.frontiersin.org/articles/10.3389/fmars.2025.1543414/full
info:eu-repo/semantics/altIdentifier/doi/10.3389/fmars.2025.1543414
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Frontiers Media
publisher.none.fl_str_mv Frontiers Media
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.176822

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