Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology

Autores
Channing, Alan; Zamuner, Alba Berta; Edwards, Dianne; Guido, Diego Martín
Año de publicación
2011
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Premise of the study: Dated molecular phylogenies suggest a Cenozoic origin for the crown group of Equisetum . but compression fossil equisetaleans that are morphologically indistinguishable from extant Equisetum and recently discovered anatomically preserved examples strongly suggest an earlier Mesozoic initial diversifi cation. Methods: In situ samples of Equisetum thermale sp. nov. from the Upper Jurassic San Agust í n hot spring deposit were collected and studied with the use of polished blocks, thin sections, and light microscopy. Key results: Equisetum thermale exhibits all the morphological and anatomical characteristics of the extant crown group Equisetum . It shows a mixture of features present in the two extant subgenera, e.g., superfi cial stomata typical of subgenus Equisetum allied with infrequently ramifying stems typical of subgenus Hippochaete . This appears to ally E . thermale with the least derived extant species in the genus Equisetum bogotense (sister species to the two subgenera). Its association of hydromorphic and xeromorphic characters allowed it to grow as an emergent aquatic in physically and chemically stressed geothermally infl uenced wetlands, where it formed dense monospecifi c stands. Equisetum thermale , because it is preserved in situ with intact anatomy, provides clear paleoecological, biological, plus inferred paleoecophysiological evidence of adaptations known in extant species. Conclusions: As the earliest unequivocal member of the genus, E. thermale supports the hypothesis of a Mesozoic origin. Its inferred tolerance of a similar range of stresses (e.g., high salinity, alkalinity, and heavy metal concentrations) to that seen in extant Equisetum suggests early evolution and subsequent maintenance of ecophysiological innovations in the genus.
Facultad de Ciencias Naturales y Museo
Materia
Ciencias Naturales
Equisetites
Equisetum
fossil
geothermal wetland
hot spring
Late Jurassic
paleoecophysiology
silica
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-nd/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/176750

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repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiologyChanning, AlanZamuner, Alba BertaEdwards, DianneGuido, Diego MartínCiencias NaturalesEquisetitesEquisetumfossilgeothermal wetlandhot springLate JurassicpaleoecophysiologysilicaPremise of the study: Dated molecular phylogenies suggest a Cenozoic origin for the crown group of Equisetum . but compression fossil equisetaleans that are morphologically indistinguishable from extant Equisetum and recently discovered anatomically preserved examples strongly suggest an earlier Mesozoic initial diversifi cation. Methods: In situ samples of Equisetum thermale sp. nov. from the Upper Jurassic San Agust í n hot spring deposit were collected and studied with the use of polished blocks, thin sections, and light microscopy. Key results: Equisetum thermale exhibits all the morphological and anatomical characteristics of the extant crown group Equisetum . It shows a mixture of features present in the two extant subgenera, e.g., superfi cial stomata typical of subgenus Equisetum allied with infrequently ramifying stems typical of subgenus Hippochaete . This appears to ally E . thermale with the least derived extant species in the genus Equisetum bogotense (sister species to the two subgenera). Its association of hydromorphic and xeromorphic characters allowed it to grow as an emergent aquatic in physically and chemically stressed geothermally infl uenced wetlands, where it formed dense monospecifi c stands. Equisetum thermale , because it is preserved in situ with intact anatomy, provides clear paleoecological, biological, plus inferred paleoecophysiological evidence of adaptations known in extant species. Conclusions: As the earliest unequivocal member of the genus, E. thermale supports the hypothesis of a Mesozoic origin. Its inferred tolerance of a similar range of stresses (e.g., high salinity, alkalinity, and heavy metal concentrations) to that seen in extant Equisetum suggests early evolution and subsequent maintenance of ecophysiological innovations in the genus.Facultad de Ciencias Naturales y Museo2011info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf680-697http://sedici.unlp.edu.ar/handle/10915/176750enginfo:eu-repo/semantics/altIdentifier/issn/0002-9122info:eu-repo/semantics/altIdentifier/doi/10.3732/ajb.1000211info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:47:43Zoai:sedici.unlp.edu.ar:10915/176750Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:47:43.533SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology
title Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology
spellingShingle Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology
Channing, Alan
Ciencias Naturales
Equisetites
Equisetum
fossil
geothermal wetland
hot spring
Late Jurassic
paleoecophysiology
silica
title_short Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology
title_full Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology
title_fullStr Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology
title_full_unstemmed Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology
title_sort Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology
dc.creator.none.fl_str_mv Channing, Alan
Zamuner, Alba Berta
Edwards, Dianne
Guido, Diego Martín
author Channing, Alan
author_facet Channing, Alan
Zamuner, Alba Berta
Edwards, Dianne
Guido, Diego Martín
author_role author
author2 Zamuner, Alba Berta
Edwards, Dianne
Guido, Diego Martín
author2_role author
author
author
dc.subject.none.fl_str_mv Ciencias Naturales
Equisetites
Equisetum
fossil
geothermal wetland
hot spring
Late Jurassic
paleoecophysiology
silica
topic Ciencias Naturales
Equisetites
Equisetum
fossil
geothermal wetland
hot spring
Late Jurassic
paleoecophysiology
silica
dc.description.none.fl_txt_mv Premise of the study: Dated molecular phylogenies suggest a Cenozoic origin for the crown group of Equisetum . but compression fossil equisetaleans that are morphologically indistinguishable from extant Equisetum and recently discovered anatomically preserved examples strongly suggest an earlier Mesozoic initial diversifi cation. Methods: In situ samples of Equisetum thermale sp. nov. from the Upper Jurassic San Agust í n hot spring deposit were collected and studied with the use of polished blocks, thin sections, and light microscopy. Key results: Equisetum thermale exhibits all the morphological and anatomical characteristics of the extant crown group Equisetum . It shows a mixture of features present in the two extant subgenera, e.g., superfi cial stomata typical of subgenus Equisetum allied with infrequently ramifying stems typical of subgenus Hippochaete . This appears to ally E . thermale with the least derived extant species in the genus Equisetum bogotense (sister species to the two subgenera). Its association of hydromorphic and xeromorphic characters allowed it to grow as an emergent aquatic in physically and chemically stressed geothermally infl uenced wetlands, where it formed dense monospecifi c stands. Equisetum thermale , because it is preserved in situ with intact anatomy, provides clear paleoecological, biological, plus inferred paleoecophysiological evidence of adaptations known in extant species. Conclusions: As the earliest unequivocal member of the genus, E. thermale supports the hypothesis of a Mesozoic origin. Its inferred tolerance of a similar range of stresses (e.g., high salinity, alkalinity, and heavy metal concentrations) to that seen in extant Equisetum suggests early evolution and subsequent maintenance of ecophysiological innovations in the genus.
Facultad de Ciencias Naturales y Museo
description Premise of the study: Dated molecular phylogenies suggest a Cenozoic origin for the crown group of Equisetum . but compression fossil equisetaleans that are morphologically indistinguishable from extant Equisetum and recently discovered anatomically preserved examples strongly suggest an earlier Mesozoic initial diversifi cation. Methods: In situ samples of Equisetum thermale sp. nov. from the Upper Jurassic San Agust í n hot spring deposit were collected and studied with the use of polished blocks, thin sections, and light microscopy. Key results: Equisetum thermale exhibits all the morphological and anatomical characteristics of the extant crown group Equisetum . It shows a mixture of features present in the two extant subgenera, e.g., superfi cial stomata typical of subgenus Equisetum allied with infrequently ramifying stems typical of subgenus Hippochaete . This appears to ally E . thermale with the least derived extant species in the genus Equisetum bogotense (sister species to the two subgenera). Its association of hydromorphic and xeromorphic characters allowed it to grow as an emergent aquatic in physically and chemically stressed geothermally infl uenced wetlands, where it formed dense monospecifi c stands. Equisetum thermale , because it is preserved in situ with intact anatomy, provides clear paleoecological, biological, plus inferred paleoecophysiological evidence of adaptations known in extant species. Conclusions: As the earliest unequivocal member of the genus, E. thermale supports the hypothesis of a Mesozoic origin. Its inferred tolerance of a similar range of stresses (e.g., high salinity, alkalinity, and heavy metal concentrations) to that seen in extant Equisetum suggests early evolution and subsequent maintenance of ecophysiological innovations in the genus.
publishDate 2011
dc.date.none.fl_str_mv 2011
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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://sedici.unlp.edu.ar/handle/10915/176750
url http://sedici.unlp.edu.ar/handle/10915/176750
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0002-9122
info:eu-repo/semantics/altIdentifier/doi/10.3732/ajb.1000211
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
dc.format.none.fl_str_mv application/pdf
680-697
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repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
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