Data from: Inferences of evolutionary history of a widely distributed mangrove species, Bruguiera gymnorrhiza, in the Indo-West Pacific region

Inference of genetic structure and demographic history is fundamental
issue in evolutionary biology. We examined the levels and patterns of
genetic variation of a widespread mangrove species in the Indo-West
Pacific region, Bruguiera gymnorrhiza, using ten nuclear gene regions.
Genetic variation of individual populations covering its distribution
range was low, but as the entire species it was comparable to other plant
species. Genetic differentiation among the investigated populations was
high. They could be divided into two genetic clusters: the West and East
clusters of the Malay Peninsula. Our results indicated that these two
genetic clusters derived from their ancestral population whose effective
size of which was much larger compared to the two extant clusters. The
point estimate of speciation time between B. gymnorrhiza and Bruguiera
sexangula was two times older than that of divergence time between the two
clusters. Migration from the West cluster to the East cluster was much
higher than the opposite direction but both estimated migration rates were
low. The past Sundaland and/or the present Malay Peninsula are likely to
prevent gene flow between the West and East clusters and function as a
geographical or land barrier.