A dinoflagellate cyst acme in the late Cretaceous of Antarctica: a consequence of palaeoclimate or nutrition?

Autores
Rodriguez Amenabar, Cecilia; Candel, Maria Soledad; Riding, James; Bowman, Vanessa; Guerstein, Gladys Raquel
Año de publicación
2014
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Some Late Cretaceous Antarctic sections have yielded the small chorate dinoflagellate cyst Impletosphaeridium clavus in extremely high proportions. The Upper Campanian-Lower Maastrichtian Snow Hill Island Formation of Ekelöf Point, James Ross Island, includes an abundance peak of Impletosphaeridium clavus representing 73.5% of the marine palynomorphs. In younger strata, specifically 250 m below the Cretaceous/Paleogene (K/Pg) boundary in the López de Bertodano Formation of Seymour Island, Impletosphaeridium clavus comprises 99% of the marine assemblage. It has been suggested that the acmes of Impletosphaeridium clavus are asssociated with the presence of Antarctic winter sea-ice during the Maastrichtian. In this hypothesis, the sea-ice influenced blooms of the parent dinoflagellate and hence the Impletosphaeridium clavus acmes. An alternative hypothesis invokes nutrient availability and the physico-chemical properties of marine waters. The latter theory appears consistent with the Impletosphaeridium clavus acme at Ekelöf Point which does not seem to be associated with ice-sea cover. However, the Maastrichtian acmes appear to probably have been sea-ice driven. During most of the Late Cretaceous-Eocene greenhouse interval, ice sheets were ephemeral, situated well inland and did not reach the coast (thereby keeping it relatively warm). Impletosphaeridium clavus is in the Order Gonyaulacales due largely to its apical archaeopyle (type 4A). Another hypothesis is that Impletosphaeridium clavus is related to the heterotrophic round brown spiny cysts (RBSCs). Autotrophic dinoflagellates produce both all gonyaulacalean cysts. By contrast, heterotrophic dinoflagellates produce peridinialean and gymnodinialean cysts. The cyst walls produced by autotrophic dinoflagellates are composed by cellulose-like glucan, while heterotrophic forms produced a nitrogen-rich glycan. This implies that nutritional strategy, not phylogeny, is the primary factor determining wall cyst composition. Wall composition differences between autotrophic and heterotrophic dinoflagellates and dinoflagellate cysts can be determined by fluorescence; autotrophic forms and their cysts exhibit autofluorescence and the heterotrophic ones do not. It is possible that the dinoflagellates which produced Impletosphaeridium clavus may have been heterotrophs, which are consistent with environments with high nutrient availability and ones cold enough to produce sea-ice. The nutrients could have been provided by melting of ice sheets during the Late Campanian- Early Maastrichtian generating acmes of Impletosphaeridium clavus. Close to the K/Pg boundary, short-term regressions and/or ocean cooling have been recongnised globally. The regression could have produced ephemeral sea-ice and erosion of land sediments proving marine nutrients to the sea and hence causing successive Impletosphaeridium clavus acmes.
Fil: Rodriguez Amenabar, Cecilia. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Candel, Maria Soledad. 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: Riding, James. British Geological Survey (bgs); Reino Unido
Fil: Bowman, Vanessa. British Antartic Survey; Reino Unido
Fil: Guerstein, Gladys Raquel. 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
4th International Palaeontological Congress
Mendoza
Argentina
Asociación Internacional de Paleontología
Materia
DINOFLAGELLATE CYSTS
ACME
LATE CRETACEOUS
ANTARCTICA
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:11336/219125

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spelling A dinoflagellate cyst acme in the late Cretaceous of Antarctica: a consequence of palaeoclimate or nutrition?Rodriguez Amenabar, CeciliaCandel, Maria SoledadRiding, JamesBowman, VanessaGuerstein, Gladys RaquelDINOFLAGELLATE CYSTSACMELATE CRETACEOUSANTARCTICAhttps://purl.org/becyt/ford/1.7https://purl.org/becyt/ford/1Some Late Cretaceous Antarctic sections have yielded the small chorate dinoflagellate cyst Impletosphaeridium clavus in extremely high proportions. The Upper Campanian-Lower Maastrichtian Snow Hill Island Formation of Ekelöf Point, James Ross Island, includes an abundance peak of Impletosphaeridium clavus representing 73.5% of the marine palynomorphs. In younger strata, specifically 250 m below the Cretaceous/Paleogene (K/Pg) boundary in the López de Bertodano Formation of Seymour Island, Impletosphaeridium clavus comprises 99% of the marine assemblage. It has been suggested that the acmes of Impletosphaeridium clavus are asssociated with the presence of Antarctic winter sea-ice during the Maastrichtian. In this hypothesis, the sea-ice influenced blooms of the parent dinoflagellate and hence the Impletosphaeridium clavus acmes. An alternative hypothesis invokes nutrient availability and the physico-chemical properties of marine waters. The latter theory appears consistent with the Impletosphaeridium clavus acme at Ekelöf Point which does not seem to be associated with ice-sea cover. However, the Maastrichtian acmes appear to probably have been sea-ice driven. During most of the Late Cretaceous-Eocene greenhouse interval, ice sheets were ephemeral, situated well inland and did not reach the coast (thereby keeping it relatively warm). Impletosphaeridium clavus is in the Order Gonyaulacales due largely to its apical archaeopyle (type 4A). Another hypothesis is that Impletosphaeridium clavus is related to the heterotrophic round brown spiny cysts (RBSCs). Autotrophic dinoflagellates produce both all gonyaulacalean cysts. By contrast, heterotrophic dinoflagellates produce peridinialean and gymnodinialean cysts. The cyst walls produced by autotrophic dinoflagellates are composed by cellulose-like glucan, while heterotrophic forms produced a nitrogen-rich glycan. This implies that nutritional strategy, not phylogeny, is the primary factor determining wall cyst composition. Wall composition differences between autotrophic and heterotrophic dinoflagellates and dinoflagellate cysts can be determined by fluorescence; autotrophic forms and their cysts exhibit autofluorescence and the heterotrophic ones do not. It is possible that the dinoflagellates which produced Impletosphaeridium clavus may have been heterotrophs, which are consistent with environments with high nutrient availability and ones cold enough to produce sea-ice. The nutrients could have been provided by melting of ice sheets during the Late Campanian- Early Maastrichtian generating acmes of Impletosphaeridium clavus. Close to the K/Pg boundary, short-term regressions and/or ocean cooling have been recongnised globally. The regression could have produced ephemeral sea-ice and erosion of land sediments proving marine nutrients to the sea and hence causing successive Impletosphaeridium clavus acmes.Fil: Rodriguez Amenabar, Cecilia. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Candel, Maria Soledad. 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: Riding, James. British Geological Survey (bgs); Reino UnidoFil: Bowman, Vanessa. British Antartic Survey; Reino UnidoFil: Guerstein, Gladys Raquel. 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; Argentina4th International Palaeontological CongressMendozaArgentinaAsociación Internacional de PaleontologíaAsociación Internacional de Paleontología2014info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectCongresoBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/219125A dinoflagellate cyst acme in the late Cretaceous of Antarctica: a consequence of palaeoclimate or nutrition?; 4th International Palaeontological Congress; Mendoza; Argentina; 2014; 1-1CONICET DigitalCONICETengInternacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:15:46Zoai:ri.conicet.gov.ar:11336/219125instacron: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:34982025-09-29 10:15:46.965CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv A dinoflagellate cyst acme in the late Cretaceous of Antarctica: a consequence of palaeoclimate or nutrition?
title A dinoflagellate cyst acme in the late Cretaceous of Antarctica: a consequence of palaeoclimate or nutrition?
spellingShingle A dinoflagellate cyst acme in the late Cretaceous of Antarctica: a consequence of palaeoclimate or nutrition?
Rodriguez Amenabar, Cecilia
DINOFLAGELLATE CYSTS
ACME
LATE CRETACEOUS
ANTARCTICA
title_short A dinoflagellate cyst acme in the late Cretaceous of Antarctica: a consequence of palaeoclimate or nutrition?
title_full A dinoflagellate cyst acme in the late Cretaceous of Antarctica: a consequence of palaeoclimate or nutrition?
title_fullStr A dinoflagellate cyst acme in the late Cretaceous of Antarctica: a consequence of palaeoclimate or nutrition?
title_full_unstemmed A dinoflagellate cyst acme in the late Cretaceous of Antarctica: a consequence of palaeoclimate or nutrition?
title_sort A dinoflagellate cyst acme in the late Cretaceous of Antarctica: a consequence of palaeoclimate or nutrition?
dc.creator.none.fl_str_mv Rodriguez Amenabar, Cecilia
Candel, Maria Soledad
Riding, James
Bowman, Vanessa
Guerstein, Gladys Raquel
author Rodriguez Amenabar, Cecilia
author_facet Rodriguez Amenabar, Cecilia
Candel, Maria Soledad
Riding, James
Bowman, Vanessa
Guerstein, Gladys Raquel
author_role author
author2 Candel, Maria Soledad
Riding, James
Bowman, Vanessa
Guerstein, Gladys Raquel
author2_role author
author
author
author
dc.subject.none.fl_str_mv DINOFLAGELLATE CYSTS
ACME
LATE CRETACEOUS
ANTARCTICA
topic DINOFLAGELLATE CYSTS
ACME
LATE CRETACEOUS
ANTARCTICA
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.7
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Some Late Cretaceous Antarctic sections have yielded the small chorate dinoflagellate cyst Impletosphaeridium clavus in extremely high proportions. The Upper Campanian-Lower Maastrichtian Snow Hill Island Formation of Ekelöf Point, James Ross Island, includes an abundance peak of Impletosphaeridium clavus representing 73.5% of the marine palynomorphs. In younger strata, specifically 250 m below the Cretaceous/Paleogene (K/Pg) boundary in the López de Bertodano Formation of Seymour Island, Impletosphaeridium clavus comprises 99% of the marine assemblage. It has been suggested that the acmes of Impletosphaeridium clavus are asssociated with the presence of Antarctic winter sea-ice during the Maastrichtian. In this hypothesis, the sea-ice influenced blooms of the parent dinoflagellate and hence the Impletosphaeridium clavus acmes. An alternative hypothesis invokes nutrient availability and the physico-chemical properties of marine waters. The latter theory appears consistent with the Impletosphaeridium clavus acme at Ekelöf Point which does not seem to be associated with ice-sea cover. However, the Maastrichtian acmes appear to probably have been sea-ice driven. During most of the Late Cretaceous-Eocene greenhouse interval, ice sheets were ephemeral, situated well inland and did not reach the coast (thereby keeping it relatively warm). Impletosphaeridium clavus is in the Order Gonyaulacales due largely to its apical archaeopyle (type 4A). Another hypothesis is that Impletosphaeridium clavus is related to the heterotrophic round brown spiny cysts (RBSCs). Autotrophic dinoflagellates produce both all gonyaulacalean cysts. By contrast, heterotrophic dinoflagellates produce peridinialean and gymnodinialean cysts. The cyst walls produced by autotrophic dinoflagellates are composed by cellulose-like glucan, while heterotrophic forms produced a nitrogen-rich glycan. This implies that nutritional strategy, not phylogeny, is the primary factor determining wall cyst composition. Wall composition differences between autotrophic and heterotrophic dinoflagellates and dinoflagellate cysts can be determined by fluorescence; autotrophic forms and their cysts exhibit autofluorescence and the heterotrophic ones do not. It is possible that the dinoflagellates which produced Impletosphaeridium clavus may have been heterotrophs, which are consistent with environments with high nutrient availability and ones cold enough to produce sea-ice. The nutrients could have been provided by melting of ice sheets during the Late Campanian- Early Maastrichtian generating acmes of Impletosphaeridium clavus. Close to the K/Pg boundary, short-term regressions and/or ocean cooling have been recongnised globally. The regression could have produced ephemeral sea-ice and erosion of land sediments proving marine nutrients to the sea and hence causing successive Impletosphaeridium clavus acmes.
Fil: Rodriguez Amenabar, Cecilia. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Candel, Maria Soledad. 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: Riding, James. British Geological Survey (bgs); Reino Unido
Fil: Bowman, Vanessa. British Antartic Survey; Reino Unido
Fil: Guerstein, Gladys Raquel. 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
4th International Palaeontological Congress
Mendoza
Argentina
Asociación Internacional de Paleontología
description Some Late Cretaceous Antarctic sections have yielded the small chorate dinoflagellate cyst Impletosphaeridium clavus in extremely high proportions. The Upper Campanian-Lower Maastrichtian Snow Hill Island Formation of Ekelöf Point, James Ross Island, includes an abundance peak of Impletosphaeridium clavus representing 73.5% of the marine palynomorphs. In younger strata, specifically 250 m below the Cretaceous/Paleogene (K/Pg) boundary in the López de Bertodano Formation of Seymour Island, Impletosphaeridium clavus comprises 99% of the marine assemblage. It has been suggested that the acmes of Impletosphaeridium clavus are asssociated with the presence of Antarctic winter sea-ice during the Maastrichtian. In this hypothesis, the sea-ice influenced blooms of the parent dinoflagellate and hence the Impletosphaeridium clavus acmes. An alternative hypothesis invokes nutrient availability and the physico-chemical properties of marine waters. The latter theory appears consistent with the Impletosphaeridium clavus acme at Ekelöf Point which does not seem to be associated with ice-sea cover. However, the Maastrichtian acmes appear to probably have been sea-ice driven. During most of the Late Cretaceous-Eocene greenhouse interval, ice sheets were ephemeral, situated well inland and did not reach the coast (thereby keeping it relatively warm). Impletosphaeridium clavus is in the Order Gonyaulacales due largely to its apical archaeopyle (type 4A). Another hypothesis is that Impletosphaeridium clavus is related to the heterotrophic round brown spiny cysts (RBSCs). Autotrophic dinoflagellates produce both all gonyaulacalean cysts. By contrast, heterotrophic dinoflagellates produce peridinialean and gymnodinialean cysts. The cyst walls produced by autotrophic dinoflagellates are composed by cellulose-like glucan, while heterotrophic forms produced a nitrogen-rich glycan. This implies that nutritional strategy, not phylogeny, is the primary factor determining wall cyst composition. Wall composition differences between autotrophic and heterotrophic dinoflagellates and dinoflagellate cysts can be determined by fluorescence; autotrophic forms and their cysts exhibit autofluorescence and the heterotrophic ones do not. It is possible that the dinoflagellates which produced Impletosphaeridium clavus may have been heterotrophs, which are consistent with environments with high nutrient availability and ones cold enough to produce sea-ice. The nutrients could have been provided by melting of ice sheets during the Late Campanian- Early Maastrichtian generating acmes of Impletosphaeridium clavus. Close to the K/Pg boundary, short-term regressions and/or ocean cooling have been recongnised globally. The regression could have produced ephemeral sea-ice and erosion of land sediments proving marine nutrients to the sea and hence causing successive Impletosphaeridium clavus acmes.
publishDate 2014
dc.date.none.fl_str_mv 2014
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Congreso
Book
http://purl.org/coar/resource_type/c_5794
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status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/219125
A dinoflagellate cyst acme in the late Cretaceous of Antarctica: a consequence of palaeoclimate or nutrition?; 4th International Palaeontological Congress; Mendoza; Argentina; 2014; 1-1
CONICET Digital
CONICET
url http://hdl.handle.net/11336/219125
identifier_str_mv A dinoflagellate cyst acme in the late Cretaceous of Antarctica: a consequence of palaeoclimate or nutrition?; 4th International Palaeontological Congress; Mendoza; Argentina; 2014; 1-1
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
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application/pdf
application/pdf
application/pdf
dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Asociación Internacional de Paleontología
publisher.none.fl_str_mv Asociación Internacional de Paleontología
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
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