DOI: 10.5061/dryad.1ns1rn92b
title: Data from: Chilling out: Cooler climates triggered divergence of Sabal (Arecaceae: Coryphoideae: Sabaleae) at the end of the mid-Miocene climatic optimum

description: In this study we explore the biogeographic patterns and processes
 underlying the diversification of Sabal, a genus of palm with a range that
 expands from the tropical rainforests of northern South America into the
 deciduous subtropical forests of the southeastern United States. We
 estimate divergence times among species of Sabal using two dated fossils
 as calibration points to inform ancestral reconstructions of the
 historical distribution of Sabal, and then use floral volatile composition
 data in select species of Sabal to integrate plant ecological interactions
 into our discussion of species distributions. Our results suggest extant
 Sabal originated within the last 21 million years with a divergence event
 ~14 Mya that effectively split the most recent common ancestor of all
 southeastern US and West Indian species from the ancestor of a clade of
 species with their current distribution in Mexico. This divergence event
 corresponds with the end of the mid-Miocene climatic optimum, which
 resulted in cooler climates across southeastern North America where extant
 cold-tolerant taxa S. minor and S. palmetto are currently distributed.
 Floral volatile data indicate a generalist pollination strategy involving
 day foraging insects. Among sampled species, floral scent profiles can
 mostly be characterized by quantitative differences in five main
 compounds: benzaldehyde, benzyl alcohol, 2-phenylethanol, (E)-β-ocimene,
 and hexanal. These profiles align with major clades recovered in our
 phylogenetic analysis of Sabal and are indicative of evolutionary trends
 in pollination ecology and reproductive isolation within the genus.
description: Gene alignment used to estimate divergence times: A supermatrix
 was generated from all gene alignments generated by Heyduk et al. 2015
 (https://doi.org/10.5061/dryad.jm78g) by concatenating separate gene alignment files. We used PartitionFinder V. 2.1.1 (Lanfear et al. 2017) to estimate the optimal partitioning scheme among genes. The partitioned alignment contained 49 partitions with substitution models assigned as either GTR, GTR+G, and GTR+G+I. 
description: # Chilling Out: Cooler climates triggered divergence of *Sabal*
 (Arecaceae: Coryphoideae: Sabaleae) at the end of the Mid-Miocene Climatic
 Optimum
 [https://doi.org/10.5061/dryad.1ns1rn92b](https://doi.org/10.5061/dryad.1ns1rn92b) The dataset contains (Concat_align_133genes_part_2) the partitioned nuclear gene alignment used in BEAST. ## Description of the data and file structure Alignment is in a nexus format that contains the best partitioning scheme (as estimated by PartitionFinder) as a data block at the end of the file. Species names are as follows: PD= *Phoenix dactylifera* libU= *Bactris major* libT= *Dictyosperma album* libC= *Sabal causiarum* libP= *Sabal minor* libH= *Sabal rosei* libE= *Sabal mauritiiformis* libQ= *Sabal miamiensis* libI= *Sabal maritima* libN= *Sabal palmetto* libL= *Sabal etonia* libO= *Sabal yapa* libG= *Sabal bermudana* libX= *Sabal uresana* libJ= *Sabal mexicana* libM= *Sabal guatemalensis* libSD= *Sabal domingensis* libS= *Sabal pumos*