Data from: Influence of Tertiary paleoenvironmental changes on the diversification of South American mammals: a relaxed molecular clock study within xenarthrans.
Delsuc, Frédéric, Institut des Sciences de l'Evolution de Montpellier
Vizcaíno, Sergio F., Departamento Científico Paleontología de Vertebrados, Museo de La Plata, La Plata, Argentina
Douzery, Emmanuel J. P., Institut des Sciences de l'Evolution de Montpellier
Published Feb 01, 2011 on Dryad.
Cite this dataset
Delsuc, Frédéric; Vizcaíno, Sergio F.; Douzery, Emmanuel J. P. (2011). Data from: Influence of Tertiary paleoenvironmental changes on the diversification of South American mammals: a relaxed molecular clock study within xenarthrans. [Dataset]. Dryad. https://doi.org/10.5061/dryad.8518
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.
Nucleotide alignment concatenation of codon positions 1+2 of ADRA2B and VWF plus all positions of BRCA1 for 50 mammalian taxa.
Nucleotide alignment concatenation of codon positions 1+2 of ADRA2B, VWF and BRCA1 for 50 mammalian taxa.
Nucleotide alignment concatenation of all codon positions of ADRA2B, BRCA1 and VWF for 50 mammalian taxa.
Chronogram inferred from the a2bv2 dataset using Multidivtime.
Chronogram inferred from the abv2 dataset using Multidivtime.
Chronogram inferred from the abv3 dataset using Multidivtime.