Myrteae phylogeny, calibration, biogeography and diversification patterns: Increased understanding in the most species rich tribe of Myrtaceae

Thais N.C. Vasconcelos and Carol E.B. Proença and Berhaman Ahmad and Daniel S. Aguilar and Reinaldo Aguilar and Bruno S. Amorim and Keron Campbell and Itayguara R. Costa and Plauto S. De-Carvalho and Jair E.Q. Faria and Augusto Giaretta and Pepijn W. Kooij and Duane F. Lima and Fiorella F. Mazine and Brigido Peguero and Gerhard Prenner and Matheus F. Santos and Julia Soewarto and Astrid Wingler and Eve J. Lucas (2017) Myrteae phylogeny, calibration, biogeography and diversification patterns: Increased understanding in the most species rich tribe of Myrtaceae. Molecular Phylogenetics and Evolution, 109. pp. 113-137. ISSN 1055-7903

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Myrteae (c. 2500 species; 51 genera) is the largest tribe of Myrtaceae and an ecologically important groups of angiosperms in the Neotropics. Systematic relationships in Myrteae are complex, hindering conservation initiatives and jeopardizing evolutionary modelling. A well-supported and robust phylogenetic hypothesis was here targeted towards a comprehensive understanding of the relationships within the tribe. The resultant topology was used as a base for key evolutionary analyses such as age estimation, historical biogeography and diversification rate patterns. One nuclear (ITS) and seven chloroplast (psbA-trnH, matK, ndhF, trnl-trnF, trnQ-rps16, rpl16 and rpl32-trnL) DNA regions for 115 taxa representing 46 out of the 51 genera in the tribe were accessed and analysed using maximum likelihood and Bayesian inference tools for phylogenetic reconstruction. Dates of diversification events were estimated and contrasted using two distinct fossil sets (macro and pollen) in BEAST. The subsequent dated phylogenies were compared and analysed for biogeographical patterns using BioGeoBEARS and diversification rates using BAMM. Myrteae phylogeny presents strong statistical support for three major clades within the tribe: Australasian group, Myrtus group and Main Neotropical Lineage. Dating results from calibration using macrofossil are an average of 20 million years older and show an early Paleocene origin of Myrteae, against a mid-Eocene one from the pollen fossil calibration. Biogeographic analysis shows the origin of Myrteae in Zealandia in both calibration approaches, followed by a widespread distribution throughout the still-linked Gondwana continents and diversification of Neotropical endemic lineages by later vicariance. Best configuration shift indicates three points of acceleration in diversification rates, all of them occurring in the Main Neotropical Lineage. Based on the reconstructed topology, several new taxonomic placements were recovered, including: the relative position of Myrtus communis, the placement of the Blepharocalyx group, the absence of generic endemism in the Caribbean, and the paraphyletism of the former Pimenta group. Distinct calibration approaches affect biogeography interpretation, increasing the number of necessary long distance dispersal events in the topology with older nodes. It is hypothesised that biological intrinsic factors such as modifications of embryo type and polyploidy might have played a role in accelerating shifts of diversification rates in Neotropical lineages. Future perspectives include formal subtribal classification, standardization of fossil calibration approaches and better links between diversification shifts and trait evolution.

Item Type: Article
Keyword: Eugenia , Evolution , Myrcia , Myrtus , Psidium , Systematics
Subjects: Q Science > QK Botany > QK1-989 Botany > QK1-474.5 General Including geographical distribution
S Agriculture > SB Plant culture > SB1-1110 Plant culture
Department: FACULTY > Faculty of Tropical Forestry
Date Deposited: 28 Oct 2022 09:01
Last Modified: 28 Oct 2022 09:01

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