TY - JOUR
T1 - Arrival and diversification of caviomorph rodents and platyrrhine primates in South America
AU - Poux, Céline
AU - Chevret, Pascale
AU - Huchon, Dorothée
AU - De Jong, Wilfried W.
AU - Douzery, Emmanuel J.P.
N1 - Funding Information:
ACKNOWLEDGMENTS We thank Ole Madsen for help and advice with the ADRA2B sequencing and for his great support. This work would not have been possible without the essential contribution of Francois Catzeflis (curator of the tissue collection of the Institut des Sciences de l'Evolution de Montpellier), and of all tissue collectors: M. Brack, J.-P. Hugot, J.-F. Mauffrey, Faune Sauvage (EDF-CNEH), M. J. Stanhope, Mr. Combes, R. Albignac, M. Tranier, O. Madsen, and N. Bons. D.H. thanks Christopher Bonar, Tammie Bettinger, and the Cleveland Metroparks Zoo for providing the samples of Dinomys. We wish to thank two anonymous reviewers, R. DeBry, and R.D.M. Page, for their helpful comments to improve the present paper. This work was supported by the TMR Network "Mammalian Phylogeny" (contract FMRX-CT98-022) of the European Community, and the "ACI Informatique-Mathematique-Physique en Biologie Moleculaire (ACI IMP-Bio)." This publication is contribution number EPML-009 of the Equipe-Projet multi-laboratoires CNRS-STIC "M6thodes informatiques pour la biologie moleculaire," and number 2005-081 of the Institut des Sciences de l'Evolution de Montpellier (UMR 5554-CNRS).
PY - 2006/4
Y1 - 2006/4
N2 - Platyrrhine primates and caviomorph rodents are clades of mammals that colonized South America during its period of isolation from the other continents, between 100 and 3 million years ago (Mya). Until now, no molecular study investigated the timing of the South American colonization by these two lineages with the same molecular data set. Using sequences from three nuclear genes (ADRA2B, vWF, and IRBP, both separate and combined) from 60 species, and eight fossil calibration constraints, we estimated the times of origin and diversification of platyrrhines and caviomorphs via a Bayesian relaxed molecular clock approach. To account for the possible effect of an accelerated rate of evolution of the IRBP gene along the branch leading to the anthropoids, we performed the datings with and without IRBP (3768 sites and 2469 sites, respectively). The time window for the colonization of South America by primates and by rodents is demarcated by the dates of origin (upper bound) and radiation (lower bound) of platyrrhines and caviomorphs. According to this approach, platyrrhine primates colonized South America between 37.0 ± 3.0 Mya (or 38.9 ± 4.0 Mya without IRBP) and 16.8 ± 2.3 (or 20.1 ± 3.3) Mya, and caviomorph rodents between 45.4 ± 4.1 (or 43.7 ± 4.8) Mya and 36.7 ± 3.7 (or 35.8 ± 4.3) Mya. Considering both the fossil record and these molecular datings, the favored scenarios are a trans-Atlantic migration of primates from Africa at the end of the Eocene or beginning of the Oligocene, and a colonization of South America by rodents during the Middle or Late Eocene. Based on our nuclear DNA data, we cannot rule out the possibility of a concomitant arrival of primates and rodents in South America. The caviomorphs radiated soon after their arrival, before the Oligocene glaciations, and these early caviomorph lineages persisted until the present. By contrast, few platyrrhine fossils are known in the Oligocene, and the present-day taxa are the result of a quite recent, Early Miocene diversification.
AB - Platyrrhine primates and caviomorph rodents are clades of mammals that colonized South America during its period of isolation from the other continents, between 100 and 3 million years ago (Mya). Until now, no molecular study investigated the timing of the South American colonization by these two lineages with the same molecular data set. Using sequences from three nuclear genes (ADRA2B, vWF, and IRBP, both separate and combined) from 60 species, and eight fossil calibration constraints, we estimated the times of origin and diversification of platyrrhines and caviomorphs via a Bayesian relaxed molecular clock approach. To account for the possible effect of an accelerated rate of evolution of the IRBP gene along the branch leading to the anthropoids, we performed the datings with and without IRBP (3768 sites and 2469 sites, respectively). The time window for the colonization of South America by primates and by rodents is demarcated by the dates of origin (upper bound) and radiation (lower bound) of platyrrhines and caviomorphs. According to this approach, platyrrhine primates colonized South America between 37.0 ± 3.0 Mya (or 38.9 ± 4.0 Mya without IRBP) and 16.8 ± 2.3 (or 20.1 ± 3.3) Mya, and caviomorph rodents between 45.4 ± 4.1 (or 43.7 ± 4.8) Mya and 36.7 ± 3.7 (or 35.8 ± 4.3) Mya. Considering both the fossil record and these molecular datings, the favored scenarios are a trans-Atlantic migration of primates from Africa at the end of the Eocene or beginning of the Oligocene, and a colonization of South America by rodents during the Middle or Late Eocene. Based on our nuclear DNA data, we cannot rule out the possibility of a concomitant arrival of primates and rodents in South America. The caviomorphs radiated soon after their arrival, before the Oligocene glaciations, and these early caviomorph lineages persisted until the present. By contrast, few platyrrhine fossils are known in the Oligocene, and the present-day taxa are the result of a quite recent, Early Miocene diversification.
KW - Biogeography
KW - Caviomorpha
KW - Colonization
KW - Molecular dating
KW - Nuclear genes
KW - Platyrrhini
KW - South America
UR - http://www.scopus.com/inward/record.url?scp=33745001667&partnerID=8YFLogxK
U2 - 10.1080/10635150500481390
DO - 10.1080/10635150500481390
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AN - SCOPUS:33745001667
SN - 1063-5157
VL - 55
SP - 228
EP - 244
JO - Systematic Biology
JF - Systematic Biology
IS - 2
ER -
