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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/219125
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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 info:ar-repo/semantics/documentoDeConferencia |
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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info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
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openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
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application/pdf 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 |
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reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) |
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CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
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dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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13.070432 |