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dc.contributor.author
Channing, Alan
dc.contributor.author
Zamuner, Alba Berta
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dc.contributor.author
Edwards, Dianne
dc.contributor.author
Guido, Diego Martin
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dc.date.available
2020-01-20T18:34:03Z
dc.date.issued
2011-04
dc.identifier.citation
Channing, Alan; Zamuner, Alba Berta; Edwards, Dianne; Guido, Diego Martin; Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: Anatomy, paleoecology, and inferred paleoecophysiology; Botanical Society of America; American Journal of Botany; 98; 4; 4-2011; 680-697
dc.identifier.issn
0002-9122
dc.identifier.uri
http://hdl.handle.net/11336/95234
dc.description.abstract
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 diversification. Methods: In situ samples of Equisetum thermale sp. nov. from the Upper Jurassic San Agustín 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., superficial 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 influenced wetlands, where it formed dense monospecific 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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Botanical Society of America
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Equisetites
dc.subject
Equisetum
dc.subject
Fossil
dc.subject
Geothermal Wetland
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Hot Spring
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Late Jurassic
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Paleoecophysiology
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Silica
dc.subject.classification
Paleontología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: Anatomy, paleoecology, and inferred paleoecophysiology
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-01-15T20:02:10Z
dc.journal.volume
98
dc.journal.number
4
dc.journal.pagination
680-697
dc.journal.pais
Estados Unidos
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dc.journal.ciudad
St. Louis
dc.description.fil
Fil: Channing, Alan. Cardiff University; Reino Unido
dc.description.fil
Fil: Zamuner, Alba Berta. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Área Paleobotánica; Argentina
dc.description.fil
Fil: Edwards, Dianne. Cardiff University; Reino Unido
dc.description.fil
Fil: Guido, Diego Martin. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
American Journal of Botany
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://bsapubs.onlinelibrary.wiley.com/doi/10.3732/ajb.1000211
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.3732/ajb.1000211
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