Shifting roles of the East China Sea in the phylogeography of red nanmu in East Asia

This dataset contains one README file and two raw data files on the
distribution and genetic data described in the paper: Jiang et
al. (2021) Shifting roles of the East China Sea in the phylogeography of
Machilus thunbergii (Lauraceae) in East Asia. Journal of Biogeography.
Ecological niche modeling was employed to predict the potential
distribution of M. thunbergii during the Last Glacial Maximum (LGM) and
the last interglacial period. Nuclear microsatellite and chloroplast
markers were used to reveal the phylogeographic pattern and infer the
population history of 33 M. thunbergii populations. The ecological niche
models suggested that the ECS provided potentially suitable habitats for
M. thunbergii during the LGM. A sharp change in cpDNA haplotypes was found
along the eastern China coasts, while microsatellites revealed a clinal
pattern for genetic composition from eastern China to central Japan. The
divergent lineages formed an admixture on the Zhoushan Archipelago of
China and Kyushu Island of Japan. The estimated divergent and admixture
times were c. 68 kyr and c. 15 kyr, corresponding to the periods where
there were rising sea levels after the MIS4 glaciation and falling sea
levels during the LGM, respectively.  Machilus thunbergii
probably underwent alternating population isolation during interglacial
periods and connection during glacial maxima across the ECS, but such
periodicity of isolation and connection seems not to have promoted
diversification as suggested by the species pump hypothesis. Incipient
divergence has been periodically wiped out due to frequent coalescence,
rendering the ECS more like a “species vacuum”, particularly for species
with relatively long generation lengths.