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

dc.creatorDelsuc, Fréderic
dc.creatorVizcaíno, Sergio Fabián
dc.creatorDouzery, Emmanuel J. P.
dc.date2004-04
dc.date2014-06-13T17:16:27Z
dc.identifierhttp://sedici.unlp.edu.ar/handle/10915/36576
dc.identifierhttp://www.biomedcentral.com/content/pdf/1471-2148-4-11.pdf
dc.identifierissn:1471-2148
dc.descriptionBackground: 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.
dc.descriptionFacultad de Ciencias Naturales y Museo
dc.formatapplication/pdf
dc.languagees
dc.rightshttp://creativecommons.org/licenses/by/3.0/
dc.rightsCreative Commons Attribution 3.0 Unported (CC BY 3.0)
dc.subjectCiencias Naturales
dc.subjectPaleontología
dc.subjectBiología
dc.subjectAmérica Latina
dc.subjectTerciario
dc.subjectarmadillo
dc.subjectbayesian dating
dc.subjectDasypodidae
dc.subjectevolution
dc.subjectglobal change
dc.subjectEdentata
dc.subjectEutheria
dc.subjectmammals
dc.subjectHystricognathi
dc.subjectpalaeontology
dc.subjectMetatheria
dc.subjectphylogeny
dc.subjectMyrmecophagidae
dc.subjectrelaxed molecular clock
dc.subjectprimates
dc.subjectXenarthrans
dc.subjectRodentia
dc.titleInfluence of Tertiary paleoenvironmental changes on the diversification of South American mammals: A relaxed molecular clock study within xenarthrans
dc.typeArticulo
dc.typeArticulo


Este ítem pertenece a la siguiente institución