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Detecting how historical and contemporary factors contribute to genetic divergence and genetic structure is a central question in ecology and evolution. We examine this question by intergrating population genetics with ecological niche modelling of  Litsea auriculata  (Lauraceae), which is endangered and native to east China. Geographical and environmental factors including climatic fluctuations since the last glacial maximum (LGM) have also contribute to population demography and patterns of genetic structure.  L .  auriculata  populations underwent expansion after divergence and dramatically decreased to the current small size with relative population bottlenecks due to climate changes. Populations separated by physical geographical barrier including geographic distance and Yangtze River, as a result contemporary gene flow among  L .  auriculata  populations showed drastic declines in comparison with historical gene flow, resulting in a high level of population divergence. Thus, patterns of genetic structure of  L .  auriculata  can result from both geographic and environmental factors including climate changes. This information is helpful in forming conservation strategies for  L .  auriculata  in China.

Understanding population structure and historical demography of Litsea auriculata (Lauraceae), an endangered species in east China