Unravelling the Cretaceous-Paleogene (KT) Turnover, Evidence from Flora, Fauna and Geology

Ocampo, A.; Vajda, Vivi; Buffetaut, Éric

doi:10.1007/3-540-25736-5_9

Cited by 14 publications

(12 citation statements)

References 80 publications

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“…8) is shortly after the Cretaceous/ Tertiary (K/T) boundary approximately 65 million years ago (Pope et al, 1998). Evidence suggests that the massive extinctions at the K/T boundary were the result of a meteorite impact causing a global cloud of dust that blocked sunlight and caused a freezing blackout (Alvarez et al, 1980), and had the long-term ecological effect of an overall drying in North and Central America (Ocampo et al, 2006). Specific morphological traits are not readily apparent as potential key innovations that contributed to the great disparity in diversification between these two main clades of Croton.…”

Section: Character Evolutionmentioning

confidence: 99%

Molecular Phylogenetics and Biogeography of the Caribbean-Centered Croton Subgenus Moacroton (Euphorbiaceae s.s.)

Berry

Riina

et al. 2008

Bot. Rev

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Initial molecular phylogenetic studies established the monophylly of the large genus Croton (Euphorbiaceae s.s.) and suggested that the group originated in the New World. A denser and more targeted sampling of Croton species points to a South American origin for the genus. The nuclear and chloroplast genomes indicate a different rooting for the phylogeny of Croton. Although we favor the rooting indicated by the chloroplast data our conclusions are also consistent with the topology inferred from the nuclear data. The satellite genera Cubacroton and Moacroton are embedded within Croton. These two genera are synonimized into Croton and a new subgenus, Croton subgenus Moacroton, is circumscribed to include them and their allied Croton species. Croton subgenus Moacroton is morphologically characterized by a primarily lepidote indumentum, bifid or simple styles, and pistillate flowers with sepals that are connate at the base. This newly circumscribed subgenus is found from North America to South America, and in contrast to the majority of Croton species most of its members are found in mesic habitats. The group is most diverse in the greater Caribbean basin. A molecular clock was calibrated to the phylogeny using the available Euphorbiaceae fossils. The timing and pattern of diversification of Croton is consistent with both the GAARlandia and Laurasian migration hypotheses. A single species, Croton poecilanthus from Puerto Rico, is placed incongruently by its nuclear and chloroplast genomes. The possibility of this species being of hybrid origin is discussed.Resumen Estudios moleculares preliminares establecieron que el género grande Croton (Euphorbiaceae s.s.) es monofilético y sugirieron que el grupo origino en el Nuevo Mundo. Un muestreo mas denso y especifico de especies de Croton apunta a un origen Suraméricano para el género. Los genomas nucleares y del cloroplasto indican una diferente raíz para la filogenia de Croton. Aunque favoramos la raíz Bot. Rev. (2008) 74:132-165 indicada por los datos del cloroplasto nuestras conclusiones también son consistentes con la topología deducida por los datos nucleares. Los géneros satélite Cubacroton y Moacroton están encajados dentro de Croton. Estos dos géneros son synonimizados dentro de Croton y un nuevo subgénero, Croton subgénero Moacroton, es circunscrito para incluirlos y las especies aliadas de Croton. Croton subgénero Moacroton esta caracterizada morfológicamente por un indumento mayormente lepidoto, estilos bifidos o simples, y flores pistiladas con sépalos unidos en la base. Este nuevamente circunscrito subgénero esta distribuido desde Norteamérica hasta Suramérica, y en contraste con la mayoría de las especies de Croton la mayoría de sus especies se encuentran en habitats húmedos. El grupo es mas diverso en la zona del Caribe. Un reloj molecular fue calibrado a la filogenia utilizando los fósiles de Euphorbiaceae disponibles. La sincronización y patrón de la diversificación de Croton son consistentes con las hipótesis de GAARlandia y la migración Laurasiana. Un...

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Section: Character Evolutionmentioning

confidence: 99%

Molecular Phylogenetics and Biogeography of the Caribbean-Centered Croton Subgenus Moacroton (Euphorbiaceae s.s.)

Berry

Riina

et al. 2008

Bot. Rev

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“…Gierliński & Ahlberg 1994;Meyer et al 2001;Turner et al 2009;Niedźwiedzki 2011;Thulborn 2013). The extinction of non-avian dinosaurs at the CretaceousPaleogene boundary has been the subject of intense debate (Ocampo et al 2006;Wigforss-Lange et al 2007;Schulte et al 2010a,b), but relatively little attention has been given to the dinosaurian response to environmental changes during the endTriassic extinction event (Brusatte et al 2010). Interestingly, Olsen et al (2002) noted that non-dinosaurian footprint diversity drops at the Tr -J boundary, whereas dinosaurian ichnogeneric diversity increases to a maximum in the overlying Jurassic sediments of the Newark Basin, USA.…”

Section: Introductionmentioning

confidence: 99%

Palynostratigraphy of dinosaur footprint-bearing deposits from the Triassic–Jurassic boundary interval of Sweden

Vajda

Calner

Ahlberg

2013

GFF

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“…The nonavian dinosaur fauna present in the Hell Creek Formation disappears at the CretaceousePaleogene boundary (e.g. Lyson et al, 2012 and references therein) reflecting the global extinction of species connected to this event where global food webs were disrupted (Vajda et al, 2001(Vajda et al, , 2004Ocampo et al, 2006: Chin et al, 2013.…”

Section: Introductionmentioning

confidence: 99%

A snapshot into the terrestrial ecosystem of an exceptionally well-preserved dinosaur (Hadrosauridae) from the Upper Cretaceous of North Dakota, USA

Vajda

Lyson

Bercovici

et al. 2013

Cretaceous Research

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Unravelling the Cretaceous-Paleogene (KT) Turnover, Evidence from Flora, Fauna and Geology

Cited by 14 publications

References 80 publications

Molecular Phylogenetics and Biogeography of the Caribbean-Centered Croton Subgenus Moacroton (Euphorbiaceae s.s.)

Molecular Phylogenetics and Biogeography of the Caribbean-Centered Croton Subgenus Moacroton (Euphorbiaceae s.s.)

Palynostratigraphy of dinosaur footprint-bearing deposits from the Triassic–Jurassic boundary interval of Sweden

A snapshot into the terrestrial ecosystem of an exceptionally well-preserved dinosaur (Hadrosauridae) from the Upper Cretaceous of North Dakota, USA

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