Influence of Tertiary paleoenvironmental changes on the diversification of South American mammals: A relaxed molecular clock study within xenarthrans

Background: Comparative genomic data among organisms allow the reconstruction of their phylogenies and evolutionary time scales. Molecular timings have been recently used to suggest that environmental global change have shaped the evolutionary history of diverse terrestrial organisms. Living xenarth...

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Detalles Bibliográficos
Autores principales: Delsuc, Fréderic, Vizcaíno, Sergio Fabián, Douzery, Emmanuel J. P.
Formato: Articulo
Lenguaje:Español
Publicado: 2004
Materias:
Ciencias Naturales
Paleontología
Biología
América Latina
Terciario
armadillo
bayesian dating
Dasypodidae
evolution
global change
Edentata
Eutheria
mammals
Hystricognathi
palaeontology
Metatheria
phylogeny
Myrmecophagidae
relaxed molecular clock
primates
Xenarthrans
Rodentia
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/36576
http://www.biomedcentral.com/content/pdf/1471-2148-4-11.pdf
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-36576
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Ciencias Naturales
Paleontología
Biología
América Latina
Terciario
armadillo
bayesian dating
Dasypodidae
evolution
global change
Edentata
Eutheria
mammals
Hystricognathi
palaeontology
Metatheria
phylogeny
Myrmecophagidae
relaxed molecular clock
primates
Xenarthrans
Rodentia
spellingShingle Ciencias Naturales
Paleontología
Biología
América Latina
Terciario
armadillo
bayesian dating
Dasypodidae
evolution
global change
Edentata
Eutheria
mammals
Hystricognathi
palaeontology
Metatheria
phylogeny
Myrmecophagidae
relaxed molecular clock
primates
Xenarthrans
Rodentia
Delsuc, Fréderic
Vizcaíno, Sergio Fabián
Douzery, Emmanuel J. P.
Influence of Tertiary paleoenvironmental changes on the diversification of South American mammals: A relaxed molecular clock study within xenarthrans
topic_facet Ciencias Naturales
Paleontología
Biología
América Latina
Terciario
armadillo
bayesian dating
Dasypodidae
evolution
global change
Edentata
Eutheria
mammals
Hystricognathi
palaeontology
Metatheria
phylogeny
Myrmecophagidae
relaxed molecular clock
primates
Xenarthrans
Rodentia
description Background: Comparative genomic data among organisms allow the reconstruction of their phylogenies and evolutionary time scales. Molecular timings have been recently used to suggest that environmental global change have shaped the evolutionary history of diverse terrestrial organisms. Living xenarthrans (armadillos, anteaters and sloths) constitute an ideal model for studying the influence of past environmental changes on species diversification. Indeed, extant xenarthran species are relicts from an evolutionary radiation enhanced by their isolation in South America during the Tertiary era, a period for which major climate variations and tectonic events are relatively well documented. Results: We applied a Bayesian approach to three nuclear genes in order to relax the molecular clock assumption while accounting for differences in evolutionary dynamics among genes and incorporating paleontological uncertainties. We obtained a molecular time scale for the evolution of extant xenarthrans and other placental mammals. Divergence time estimates provide substantial evidence for contemporaneous diversification events among independent xenarthran lineages. This correlated pattern of diversification might possibly relate to major environmental changes that occurred in South America during the Cenozoic. Conclusions: The observed synchronicity between planetary and biological events suggests that global change played a crucial role in shaping the evolutionary history of extant xenarthrans. Our findings open ways to test this hypothesis further in other South American mammalian endemics like hystricognath rodents, platyrrhine primates, and didelphid marsupials.
format Articulo
Articulo
author Delsuc, Fréderic
Vizcaíno, Sergio Fabián
Douzery, Emmanuel J. P.
author_facet Delsuc, Fréderic
Vizcaíno, Sergio Fabián
Douzery, Emmanuel J. P.
author_sort Delsuc, Fréderic
title Influence of Tertiary paleoenvironmental changes on the diversification of South American mammals: A relaxed molecular clock study within xenarthrans
title_short Influence of Tertiary paleoenvironmental changes on the diversification of South American mammals: A relaxed molecular clock study within xenarthrans
title_full Influence of Tertiary paleoenvironmental changes on the diversification of South American mammals: A relaxed molecular clock study within xenarthrans
title_fullStr Influence of Tertiary paleoenvironmental changes on the diversification of South American mammals: A relaxed molecular clock study within xenarthrans
title_full_unstemmed Influence of Tertiary paleoenvironmental changes on the diversification of South American mammals: A relaxed molecular clock study within xenarthrans
title_sort influence of tertiary paleoenvironmental changes on the diversification of south american mammals: a relaxed molecular clock study within xenarthrans
publishDate 2004
url http://sedici.unlp.edu.ar/handle/10915/36576
http://www.biomedcentral.com/content/pdf/1471-2148-4-11.pdf
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