Abstract
Orographic and climatic influences during the Pleistocene have had a crucial role on interspecific divergence and population demography during speciation. However, associations between demographic histories of closely related species and related climatic events, especially in north and northeast China, are still underexplored. Genetic analyses with four chloroplast DNA and two nuclear genes and species distribution modeling were used for two closely related oak species (Quercus liaotungensis and Quercus mongolica) to test if their interspecific divergence and phylogeographical histories were possibly related to the Pleistocene-era climatic events. Potential divergence of the two oak species was estimated at about 0.92–2.15 Ma. Species distribution models and genetic data showed varying phylogeographical histories and spatial population structures between the two oaks, leading to different patterns of interspecific gene flow between the chloroplast and nuclear genes. The results indicate that speciation event between the two species is recent and may have been triggered by geological and climatic fluctuations linked to the upheavals of the Qinghai-Tibetan Plateau at the Pliocene/Pleistocene boundary. The two closely related oaks possess varying population demography during the interglacial-glacial climatic oscillations of the Quaternary, probably due to the various niche adaptations among different distribution ranges across their species trajectories.
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Acknowledgments
We thank Dr. Edward Biffin at the University of Adelaide in Australia for editing the English of the paper. We also thank Dr. Panfeng Dai, Dr. Zhaohui Huang, and Dr. Tao Zhou for their assistance on sample collections. We are grateful to Dr. Zhonghu Li and Dr. Peng Zhao for their valuable suggestions on data analyses. This work was financially supported by the Program for Changjiang Scholars and Innovative Research Team in University (No. IRT1174) and the Project of the Key Laboratory of Shaanxi Education Department (No. JH12321).
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The sequences generated in this study were deposited in GenBank (KM083911-KM084725, KP773481-KP774039).
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Yang, J., Di, X., Meng, X. et al. Phylogeography and evolution of two closely related oak species (Quercus) from north and northeast China. Tree Genetics & Genomes 12, 89 (2016). https://doi.org/10.1007/s11295-016-1044-5
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DOI: https://doi.org/10.1007/s11295-016-1044-5