Tatsuo Ohtsuki, Hajime Ikeda and Hiroaki Setoguchi Recent colonization by a coastal plant of inland habitats at an ancient freshwater lake, Lake Biwa: multilocus sequencing and a demographic history of Lathyrus japonicus (Fabaceae) Ecology and Evolution 3
Ancient lakes, continuous existence for millions of years, are have been recognized as “long-term isolated islands” in terrestrial ecosystems and are home to landlocked species. Lake Biwa, one of the world's few ancient freshwater lakes, harbors many coastal plants that also inhabit marine coastlines. We assessed the genetic isolation of beach pea, Lathyrus japonicus, in this ancient freshwater lake using an isolation with migration (IM) model based on variation at eight nuclear DNA loci. The estimated demographic parameters revealed a recent divergence (postglacial period) of inland populations, suggesting that a Holocene thermal maximum was involved in the origin of the Biwa populations and their genetic divergence.
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