Artículo

Gandolfo, M.A.; Hermsen, E.J.; Zamaloa, M.C.; Nixon, K.C.; González, C.C.; Wilf, P.; Cúneo, N.; Johnson, K.R. "Oldest known eucalyptus macrofossils are from south america" (2011) PLoS ONE. 6(6)
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Abstract:

The evolutionary history of Eucalyptus and the eucalypts, the larger clade of seven genera including Eucalyptus that today have a natural distribution almost exclusively in Australasia, is poorly documented from the fossil record. Little physical evidence exists bearing on the ancient geographical distributions or morphologies of plants within the clade. Herein, we introduce fossil material of Eucalyptus from the early Eocene (ca. 51.9 Ma) Laguna del Hunco paleoflora of Chubut Province, Argentina; specimens include multiple leaves, infructescences, and dispersed capsules, several flower buds, and a single flower. Morphological similarities that relate the fossils to extant eucalypts include leaf shape, venation, and epidermal oil glands; infructescence structure; valvate capsulate fruits; and operculate flower buds. The presence of a staminophore scar on the fruits links them to Eucalyptus, and the presence of a transverse scar on the flower buds indicates a relationship to Eucalyptus subgenus Symphyomyrtus. Phylogenetic analyses of morphological data alone and combined with aligned sequence data from a prior study including 16 extant eucalypts, one outgroup, and a terminal representing the fossils indicate that the fossils are nested within Eucalyptus. These are the only illustrated Eucalyptus fossils that are definitively Eocene in age, and the only conclusively identified extant or fossil eucalypts naturally occurring outside of Australasia and adjacent Mindanao. Thus, these fossils indicate that the evolution of the eucalypt group is not constrained to a single region. Moreover, they strengthen the taxonomic connections between the Laguna del Hunco paleoflora and extant subtropical and tropical Australasia, one of the three major ecologic-geographic elements of the Laguna del Hunco paleoflora. The age and affinities of the fossils also indicate that Eucalyptus subgenus Symphyomyrtus is older than previously supposed. Paleoecological data indicate that the Patagonian Eucalyptus dominated volcanically disturbed areas adjacent to standing rainforest surrounding an Eocene caldera lake. © 2011 Gandolfo et al.

Registro:

Documento: Artículo
Título:Oldest known eucalyptus macrofossils are from south america
Autor:Gandolfo, M.A.; Hermsen, E.J.; Zamaloa, M.C.; Nixon, K.C.; González, C.C.; Wilf, P.; Cúneo, N.; Johnson, K.R.
Filiación:L.H. Bailey Hortorium, Department of Plant Biology, Cornell University, Ithaca, NY, United States
Departamento de Ecología, Genética y Evolución, Universidad de Buenos Aires, Capital Federal, Buenos Aires, Argentina
Museo Paleontologico Egidio Feruglio-Consejo Nacional de Investigaciones Cientificas y Tecnicas, Trelew, Chubut, Argentina
Department of Geosciences, Pennsylvania State University, University Park, PA, United States
Denver Museum of Nature and Science, Denver, CO, United States
Palabras clave:Argentina; article; Australia and New Zealand; biogeographic region; bud; cladistics; Eocene; Eucalyptus; evolution; extant species; flower morphology; fossil plant; fruit (structure); geographic origin; inflorescence; leaf vein; macrofossil; nonhuman; paleoecology; Philippines; phylogeny; plant leaf; plant morphology; plant taxonomy; rain forest; sequence alignment; South America; fossil; Eucalyptus; Symphyomyrtus; Eucalyptus; Fossils; South America
Año:2011
Volumen:6
Número:6
DOI: http://dx.doi.org/10.1371/journal.pone.0021084
Título revista:PLoS ONE
Título revista abreviado:PLoS ONE
ISSN:19326203
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19326203_v6_n6_p_Gandolfo

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Citas:

---------- APA ----------
Gandolfo, M.A., Hermsen, E.J., Zamaloa, M.C., Nixon, K.C., González, C.C., Wilf, P., Cúneo, N.,..., Johnson, K.R. (2011) . Oldest known eucalyptus macrofossils are from south america. PLoS ONE, 6(6).
http://dx.doi.org/10.1371/journal.pone.0021084
---------- CHICAGO ----------
Gandolfo, M.A., Hermsen, E.J., Zamaloa, M.C., Nixon, K.C., González, C.C., Wilf, P., et al. "Oldest known eucalyptus macrofossils are from south america" . PLoS ONE 6, no. 6 (2011).
http://dx.doi.org/10.1371/journal.pone.0021084
---------- MLA ----------
Gandolfo, M.A., Hermsen, E.J., Zamaloa, M.C., Nixon, K.C., González, C.C., Wilf, P., et al. "Oldest known eucalyptus macrofossils are from south america" . PLoS ONE, vol. 6, no. 6, 2011.
http://dx.doi.org/10.1371/journal.pone.0021084
---------- VANCOUVER ----------
Gandolfo, M.A., Hermsen, E.J., Zamaloa, M.C., Nixon, K.C., González, C.C., Wilf, P., et al. Oldest known eucalyptus macrofossils are from south america. PLoS ONE. 2011;6(6).
http://dx.doi.org/10.1371/journal.pone.0021084