Holocene aquatic ferns (Salviniaceae) from the eastern Chaco Region, Northeastern Argentina

Autores
Contreras, Silvina Andrea; Robledo, Juan Manuel
Año de publicación
2020
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The Chaco region is a large subtropical plain and one of the major biogeographic and morphostructural areas of South-America. Eastern Chaco is the wettest sector of the Chaco region and has heterogeneous environments. Vegetation results of Quaternary alluvial plain dynam-ics including the intensive migration of the Cha-co main rivers. Paleobotanical records do not attest significant floristic changes in the region during the last 10,000 years. Fern macrofossils (vegetative part impressions) and microfossils (spores) belonging to the group of heterosporous aquatic ferns (Salviniaceae) were collected from two sites (Formosa Province, Argentina) which include sediments of the Fidelidad Formation (Late Holocene - Bermejo River natural levees, Villa Escolar). Impressions correspond to Salvinia Ség. The floating leaves are orbicular to ellip-tical in shape, with smooth margin and both the apex as the base are rounded. The base bears a slightly developed keel. Venation pattern is di-chotomous. These veins are anastomosed forming areolas. Generally, four tubercles (trichome bases) per areola are observed. The microfos-sils correspond to massulae and spores of Azol-la Lam. The massulae are rounded, oval or kidney shaped and have septate glochidia. Spores are trilete and spheroidal. Aquatic ferns are sig-nificant paleoenvironmental indicators of open fresh water or wetlands, while Azolla and Salvin-ia represent floating plants. This evidence sug-gests that the basal sediments of the Fidelidad Formation formed under environments similar to those currently observed in the region.
Fil: Contreras, Silvina Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina
Fil: Robledo, Juan Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina
2nd Palaeontological Virtual Congress
España
Paleontological Society
Materia
AZOLLA
SALVINIA
MASSULAE
CHACO REGION
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:11336/225512
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Holocene aquatic ferns (Salviniaceae) from the eastern Chaco Region, Northeastern ArgentinaContreras, Silvina AndreaRobledo, Juan ManuelAZOLLASALVINIAMASSULAECHACO REGIONhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Chaco region is a large subtropical plain and one of the major biogeographic and morphostructural areas of South-America. Eastern Chaco is the wettest sector of the Chaco region and has heterogeneous environments. Vegetation results of Quaternary alluvial plain dynam-ics including the intensive migration of the Cha-co main rivers. Paleobotanical records do not attest significant floristic changes in the region during the last 10,000 years. Fern macrofossils (vegetative part impressions) and microfossils (spores) belonging to the group of heterosporous aquatic ferns (Salviniaceae) were collected from two sites (Formosa Province, Argentina) which include sediments of the Fidelidad Formation (Late Holocene - Bermejo River natural levees, Villa Escolar). Impressions correspond to Salvinia Ség. The floating leaves are orbicular to ellip-tical in shape, with smooth margin and both the apex as the base are rounded. The base bears a slightly developed keel. Venation pattern is di-chotomous. These veins are anastomosed forming areolas. Generally, four tubercles (trichome bases) per areola are observed. The microfos-sils correspond to massulae and spores of Azol-la Lam. The massulae are rounded, oval or kidney shaped and have septate glochidia. Spores are trilete and spheroidal. Aquatic ferns are sig-nificant paleoenvironmental indicators of open fresh water or wetlands, while Azolla and Salvin-ia represent floating plants. This evidence sug-gests that the basal sediments of the Fidelidad Formation formed under environments similar to those currently observed in the region.Fil: Contreras, Silvina Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; ArgentinaFil: Robledo, Juan Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina2nd Palaeontological Virtual CongressEspañaPaleontological SocietyPalaeontological Virtual Congress2020info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectCongresoBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/225512Holocene aquatic ferns (Salviniaceae) from the eastern Chaco Region, Northeastern Argentina; 2nd Palaeontological Virtual Congress; España; 2020; 1-2978-84-09-20283-6CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://palaeovc.org/index.php/downloads/Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T12:18:58Zoai:ri.conicet.gov.ar:11336/225512instacron: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 12:18:58.844CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Holocene aquatic ferns (Salviniaceae) from the eastern Chaco Region, Northeastern Argentina
title Holocene aquatic ferns (Salviniaceae) from the eastern Chaco Region, Northeastern Argentina
spellingShingle Holocene aquatic ferns (Salviniaceae) from the eastern Chaco Region, Northeastern Argentina
Contreras, Silvina Andrea
AZOLLA
SALVINIA
MASSULAE
CHACO REGION
title_short Holocene aquatic ferns (Salviniaceae) from the eastern Chaco Region, Northeastern Argentina
title_full Holocene aquatic ferns (Salviniaceae) from the eastern Chaco Region, Northeastern Argentina
title_fullStr Holocene aquatic ferns (Salviniaceae) from the eastern Chaco Region, Northeastern Argentina
title_full_unstemmed Holocene aquatic ferns (Salviniaceae) from the eastern Chaco Region, Northeastern Argentina
title_sort Holocene aquatic ferns (Salviniaceae) from the eastern Chaco Region, Northeastern Argentina
dc.creator.none.fl_str_mv Contreras, Silvina Andrea
Robledo, Juan Manuel
author Contreras, Silvina Andrea
author_facet Contreras, Silvina Andrea
Robledo, Juan Manuel
author_role author
author2 Robledo, Juan Manuel
author2_role author
dc.subject.none.fl_str_mv AZOLLA
SALVINIA
MASSULAE
CHACO REGION
topic AZOLLA
SALVINIA
MASSULAE
CHACO REGION
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 Chaco region is a large subtropical plain and one of the major biogeographic and morphostructural areas of South-America. Eastern Chaco is the wettest sector of the Chaco region and has heterogeneous environments. Vegetation results of Quaternary alluvial plain dynam-ics including the intensive migration of the Cha-co main rivers. Paleobotanical records do not attest significant floristic changes in the region during the last 10,000 years. Fern macrofossils (vegetative part impressions) and microfossils (spores) belonging to the group of heterosporous aquatic ferns (Salviniaceae) were collected from two sites (Formosa Province, Argentina) which include sediments of the Fidelidad Formation (Late Holocene - Bermejo River natural levees, Villa Escolar). Impressions correspond to Salvinia Ség. The floating leaves are orbicular to ellip-tical in shape, with smooth margin and both the apex as the base are rounded. The base bears a slightly developed keel. Venation pattern is di-chotomous. These veins are anastomosed forming areolas. Generally, four tubercles (trichome bases) per areola are observed. The microfos-sils correspond to massulae and spores of Azol-la Lam. The massulae are rounded, oval or kidney shaped and have septate glochidia. Spores are trilete and spheroidal. Aquatic ferns are sig-nificant paleoenvironmental indicators of open fresh water or wetlands, while Azolla and Salvin-ia represent floating plants. This evidence sug-gests that the basal sediments of the Fidelidad Formation formed under environments similar to those currently observed in the region.
Fil: Contreras, Silvina Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina
Fil: Robledo, Juan Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina
2nd Palaeontological Virtual Congress
España
Paleontological Society
description The Chaco region is a large subtropical plain and one of the major biogeographic and morphostructural areas of South-America. Eastern Chaco is the wettest sector of the Chaco region and has heterogeneous environments. Vegetation results of Quaternary alluvial plain dynam-ics including the intensive migration of the Cha-co main rivers. Paleobotanical records do not attest significant floristic changes in the region during the last 10,000 years. Fern macrofossils (vegetative part impressions) and microfossils (spores) belonging to the group of heterosporous aquatic ferns (Salviniaceae) were collected from two sites (Formosa Province, Argentina) which include sediments of the Fidelidad Formation (Late Holocene - Bermejo River natural levees, Villa Escolar). Impressions correspond to Salvinia Ség. The floating leaves are orbicular to ellip-tical in shape, with smooth margin and both the apex as the base are rounded. The base bears a slightly developed keel. Venation pattern is di-chotomous. These veins are anastomosed forming areolas. Generally, four tubercles (trichome bases) per areola are observed. The microfos-sils correspond to massulae and spores of Azol-la Lam. The massulae are rounded, oval or kidney shaped and have septate glochidia. Spores are trilete and spheroidal. Aquatic ferns are sig-nificant paleoenvironmental indicators of open fresh water or wetlands, while Azolla and Salvin-ia represent floating plants. This evidence sug-gests that the basal sediments of the Fidelidad Formation formed under environments similar to those currently observed in the region.
publishDate 2020
dc.date.none.fl_str_mv 2020
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/11336/225512
Holocene aquatic ferns (Salviniaceae) from the eastern Chaco Region, Northeastern Argentina; 2nd Palaeontological Virtual Congress; España; 2020; 1-2
978-84-09-20283-6
CONICET Digital
CONICET
url http://hdl.handle.net/11336/225512
identifier_str_mv Holocene aquatic ferns (Salviniaceae) from the eastern Chaco Region, Northeastern Argentina; 2nd Palaeontological Virtual Congress; España; 2020; 1-2
978-84-09-20283-6
CONICET Digital
CONICET
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language eng
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eu_rights_str_mv openAccess
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dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Palaeontological Virtual Congress
publisher.none.fl_str_mv Palaeontological Virtual Congress
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repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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