Early evolution of the angiosperm clade Asteraceae in the Cretaceous of Antarctica

The Asteraceae (sunflowers and daisies) are the most diverse family of flowering plants. Despite their prominent role in extant terrestrial ecosystems, the early evolutionary history of this family remains poorly understood. Here we report the discovery of a number of fossil pollen grains preserved...

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Autores principales: Barreda, Viviana Dora, Palazzesi, Luis, Tellería, María Cristina, Olivero, Eduardo B., Raine, J. Ian, Forest, Félix
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Ciencias Naturales
Asteraceae
evolution
Antarctica
fossil
phylogenetics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/105821
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-105821
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Asteraceae
evolution
Antarctica
fossil
phylogenetics
spellingShingle Ciencias Naturales
Asteraceae
evolution
Antarctica
fossil
phylogenetics
Barreda, Viviana Dora
Palazzesi, Luis
Tellería, María Cristina
Olivero, Eduardo B.
Raine, J. Ian
Forest, Félix
Early evolution of the angiosperm clade Asteraceae in the Cretaceous of Antarctica
topic_facet Ciencias Naturales
Asteraceae
evolution
Antarctica
fossil
phylogenetics
description The Asteraceae (sunflowers and daisies) are the most diverse family of flowering plants. Despite their prominent role in extant terrestrial ecosystems, the early evolutionary history of this family remains poorly understood. Here we report the discovery of a number of fossil pollen grains preserved in dinosaur-bearing deposits from the Late Cretaceous of Antarctica that drastically pushes back the timing of assumed origin of the family. Reliably dated to ∼76–66 Mya, these specimens are about 20 million years older than previously known records for the Asteraceae. Using a phylogenetic approach, we interpreted these fossil specimens as members of an extinct early diverging clade of the family, associated with subfamily Barnadesioideae. Based on a molecular phylogenetic tree calibrated using fossils, including the ones reported here, we estimated that the most recent common ancestor of the family lived at least 80 Mya in Gondwana, well before the thermal and biogeographical isolation of Antarctica. Most of the early diverging lineages of the family originated in a narrow time interval after the K/P boundary, 60–50 Mya, coinciding with a pronounced climatic warming during the Late Paleocene and Early Eocene, and the scene of a dramatic rise in flowering plant diversity. Our age estimates reduce earlier discrepancies between the age of the fossil record and previous molecular estimates for the origin of the family, bearing important implications in the evolution of flowering plants in general.
format Articulo
Articulo
author Barreda, Viviana Dora
Palazzesi, Luis
Tellería, María Cristina
Olivero, Eduardo B.
Raine, J. Ian
Forest, Félix
author_facet Barreda, Viviana Dora
Palazzesi, Luis
Tellería, María Cristina
Olivero, Eduardo B.
Raine, J. Ian
Forest, Félix
author_sort Barreda, Viviana Dora
title Early evolution of the angiosperm clade Asteraceae in the Cretaceous of Antarctica
title_short Early evolution of the angiosperm clade Asteraceae in the Cretaceous of Antarctica
title_full Early evolution of the angiosperm clade Asteraceae in the Cretaceous of Antarctica
title_fullStr Early evolution of the angiosperm clade Asteraceae in the Cretaceous of Antarctica
title_full_unstemmed Early evolution of the angiosperm clade Asteraceae in the Cretaceous of Antarctica
title_sort early evolution of the angiosperm clade asteraceae in the cretaceous of antarctica
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/105821
work_keys_str_mv AT barredavivianadora earlyevolutionoftheangiospermcladeasteraceaeinthecretaceousofantarctica
AT palazzesiluis earlyevolutionoftheangiospermcladeasteraceaeinthecretaceousofantarctica
AT telleriamariacristina earlyevolutionoftheangiospermcladeasteraceaeinthecretaceousofantarctica
AT oliveroeduardob earlyevolutionoftheangiospermcladeasteraceaeinthecretaceousofantarctica
AT rainejian earlyevolutionoftheangiospermcladeasteraceaeinthecretaceousofantarctica
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bdutipo_str Repositorios
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