DOI: 10.5061/dryad.mm1ft40
title: Data from: Changing ecological opportunities facilitated the explosive diversification of New Caledonian Oxera (Lamiaceae)

description: Phylogenies recurrently demonstrate that oceanic island systems have been
 home to rapid clade diversification and adaptive radiations. The existence
 of adaptive radiations posits a central role of natural selection causing
 ecological divergence and speciation, and some plant radiations have been
 highlighted as paradigmatic examples of such radiations. However, neutral
 processes may also drive speciation during clade radiations, with
 ecological divergence occurring following speciation. Here we document an
 exceptionally rapid and unique radiation of Lamiaceae within the New
 Caledonian biodiversity hotspot. Specifically, we investigated various
 biological, ecological and geographical drivers of species diversification
 within the genus Oxera. We found that Oxera underwent an initial process
 of rapid cladogenesis likely triggered by a dramatic period of aridity
 during the early Pliocene. This early diversification of Oxera was
 associated with an important phase of ecological diversification triggered
 by significant shifts of pollination syndromes, dispersal modes, and life
 forms. Finally, recent diversification of Oxera appears to have been
 further driven by the interplay of allopatry and habitat shifts likely
 related to climatic oscillations. This suggests that Oxera could be
 regarded as an adaptive radiation at an early evolutionary stage that has
 been obscured by more recent joint habitat diversification and neutral
 geographical processes. Diversification within Oxera has perhaps been
 triggered by varied ecological and biological drivers acting in a leapfrog
 pattern, but geographic processes may have been an equally important
 driver. We suspect that strictly adaptive radiations may be rare in plants
 and that most events of rapid clade diversification may have involved a
 mixture of geographical and ecological divergence.
description: DNA alignment
 matricesWe provide in these
 files the alignment matrices of all DNA loci that we used in our study and
 the settings used in the Bayesian phylogenetic analyses, for our three DNA
 datasets (the "Lamiales", "Lamiaceae", and
 "Oxera" datasets). We provide two files for each dataset, the
 first contains only the DNA characters used for building our phylogenies,
 the second contains all DNA charactersBarrabe_et_al_DNA_alignments.zipPhylogenetic treesWe provide in these files the phylogenetic trees built in our study for our three DNA datasets (the "Lamiales", "Lamiaceae", and "Oxera" datasets). We provide two files for each dataset, the first contains the majority rule tree inferred from MCMC Bayesian analyses under MrBayes, the second contains the maximum credibility clade dated tree inferred from analyses under BEASTBarrabe_et_al_phylogenetic_trees.zipGeographical datasetsWe provide in these files the geographical datasets that we used in our study. They contains (1) the geographical area of each Oxera species, (2) range asymmetries between each Oxera species pair, (3) range overlaps between each Oxera species pairBarrabe_et_al_geographical_datas.zipAppendicesAppendices 1 through 19 are included in this file.Barrabe et al Oxera_Radiation_Paper_Appendices.docx