Fossils matter: improved estimates of divergence times in Pinus reveal older diversification.

Détails

Ressource 1Télécharger: s12862-017-0941-z.pdf (1402.80 [Ko])
Etat: Public
Version: Final published version
ID Serval
serval:BIB_055928EC2337
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Fossils matter: improved estimates of divergence times in Pinus reveal older diversification.
Périodique
BMC Evolutionary Biology
Auteur⸱e⸱s
Saladin B., Leslie A.B., Wüest R.O., Litsios G., Conti E., Salamin N., Zimmermann N.E.
ISSN
1471-2148 (Electronic)
ISSN-L
1471-2148
Statut éditorial
Publié
Date de publication
2017
Peer-reviewed
Oui
Volume
17
Numéro
1
Pages
95
Langue
anglais
Résumé
The taxonomy of pines (genus Pinus) is widely accepted and a robust gene tree based on entire plastome sequences exists. However, there is a large discrepancy in estimated divergence times of major pine clades among existing studies, mainly due to differences in fossil placement and dating methods used. We currently lack a dated molecular phylogeny that makes use of the rich pine fossil record, and this study is the first to estimate the divergence dates of pines based on a large number of fossils (21) evenly distributed across all major clades, in combination with applying both node and tip dating methods.
We present a range of molecular phylogenetic trees of Pinus generated within a Bayesian framework. We find the origin of crown Pinus is likely up to 30 Myr older (Early Cretaceous) than inferred in most previous studies (Late Cretaceous) and propose generally older divergence times for major clades within Pinus than previously thought. Our age estimates vary significantly between the different dating approaches, but the results generally agree on older divergence times. We present a revised list of 21 fossils that are suitable to use in dating or comparative analyses of pines.
Reliable estimates of divergence times in pines are essential if we are to link diversification processes and functional adaptation of this genus to geological events or to changing climates. In addition to older divergence times in Pinus, our results also indicate that node age estimates in pines depend on dating approaches and the specific fossil sets used, reflecting inherent differences in various dating approaches. The sets of dated phylogenetic trees of pines presented here provide a way to account for uncertainties in age estimations when applying comparative phylogenetic methods.

Mots-clé
Animals, Bayes Theorem, Evolution, Molecular, Fossils, Genetic Speciation, Phylogeny, Pinus/classification, Pinus/genetics, Bayesian clock dating, Fossil calibration, Fossilized birth-death, Molecular clock calibration, Node dating, Pines
Pubmed
Web of science
Open Access
Oui
Création de la notice
11/04/2017 17:19
Dernière modification de la notice
20/08/2019 12:27
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