10.5061/DRYAD.5JC73
Mairal, Mario
Spanish National Research Council
Pokorny, Lisa
Spanish National Research Council
Alarcón, Marisa
Botanical Institute of Barcelona
Aldasoro, Juan J.
Botanical Institute of Barcelona
Sanmartín, Isabel
Spanish National Research Council
Data from: Ancient vicariance and climate-driven extinction explain
continental-wide disjunctions in Africa: the case of the Rand Flora genus
Canarina (Campanulaceae)
Dryad
dataset
2015
Canarina canariensis
Canarina eminii
Cyclocodon lancifolium
climate-driven extinction
Continental islands
vicariance
nested phylogenetic dating
Platycodon grandiflorum
long-distance dispersal
Canarina abyssinica
Bayesian biogeography
Ostrowskia magnifica
Miocene
2015-02-12T19:48:39Z
2015-02-12T19:48:39Z
en
https://doi.org/10.1111/mec.13114
100913 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Transoceanic distributions have attracted the interest of scientists for
centuries. Less attention has been paid to the evolutionary origins of
‘continent-wide’ disjunctions, in which related taxa are distributed
across isolated regions within the same continent. A prime example is the
‘Rand Flora’ pattern, which shows sister taxa disjunctly distributed in
the continental margins of Africa. Here, we explore the evolutionary
origins of this pattern using the genus Canarina, with three species: C.
canariensis, associated with the Canarian laurisilva, and C. eminii and C.
abyssinica, endemic to the Afromontane region in East Africa, as case
study. We infer phylogenetic relationships, divergence times and the
history of migration events within Canarina using Bayesian inference on a
large sample of chloroplast and nuclear sequences. Ecological niche
modelling was employed to infer the climatic niche of Canarina through
time. Dating was performed with a novel nested approach to solve the
problem of using deep time calibration points within a molecular dataset
comprising both above-species and population-level sampling. Results show
C. abyssinica as sister to a clade formed by disjunct C. eminii and C.
canariensis. Miocene divergences were inferred among species, whereas
infraspecific divergences fell within the Pleistocene–Holocene periods.
Although C. eminii and C. canariensis showed a strong genetic geographic
structure, among-population divergences were older in the former than in
the latter. Our results suggest that Canarina originated in East Africa
and later migrated across North Africa, with vicariance and
aridification-driven extinction explaining the 7000 km/7 million year
divergence between the Canarian and East African endemics.
Fig2A_cpDNA_PlatycodoneaeNEXUS and tre files with the analysis settings
used in MrBayes inferred from the concatenated chloroplast dataset
(psbJ-petA, trnL-trnF, petB-petD) for the
PlatycodoneaeFig2B_ITS_platycodoneaeNEXUS and tre files with the analysis
settings used in MrBayes inferred from the nuclear ribosomal dataset (ITS)
for PlatycodoneaeFig2C_ITS_4cpdnaNEXUS and tre files with the analysis
settings used in MrBayes inferred from the combined nuclear and
chloroplast dataset (ITS, psbJ-petA, trnL-trnF, petB-petD, trnS-trnG) for
PlatycodoneaeNested-dating approach analysisScript (.xml) and tre files
for the "Nested analyses" of all three linked datasets:
Platycodoneae, C. eminii and C. canariensisNested Analysis.zipFigure
S1Nexus and .tre files for the single-gene analyses of the Platycodoneae
dataset.Figure S2Nexus and .tre files for the single-gene analyses of the
Canarina dataset
Canary Islands
Asia
Africa