Plant Diversity ›› 2023, Vol. 45 ›› Issue (01): 20-26.DOI: 10.1016/j.pld.2022.05.006

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Asymmetric migration dynamics of the tropical Asian and Australasian floras

Li-Guo Zhanga, Xiao-Qian Lib, Wei-Tao Jina, Yu-Juan Liua, Yao Zhaoa, Jun Ronga, Xiao-Guo Xianga   

  1. a. Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity, Institute of Life Science and School of Life Sciences, Nanchang University, Nanchang, Jiangxi, 330031, China;
    b. State Key Laboratory of Systematic and Evolutionary Botany, Chinese Academy of Sciences, Beijing, 100093, China
  • Received:2022-01-27 Revised:2022-05-21 Published:2023-02-23
  • Contact: Xiao-Guo Xiang,E-mail:xiangxg2010@163.com
  • Supported by:
    This research was supported by the National Natural Science Foundation of China (31670212, 32060056, and 31300181), and the National Natural Science Foundation of China-Yunnan Joint Fund Project (U1802242), and Guangxi Key Laboratory Construction Project (19-185-7).

Abstract: The tropical Asian and Australasian floras have a close relationship, and is a vital distribution pattern of seed plants worldwide. As estimated, more than 81 families and 225 genera of seed plants distributed between tropical Asia and Australasia. However, the evolutionary dynamics of two floras were still vague. Here, a total of 29 plant lineages, represented the main clades of seed plants and different habits, were selected to investigate the biotic interchange between tropical Asia and Australasia by integrated dated phylogenies, biogeography, and ancestral state reconstructions. Our statistics indicated that 68 migrations have occurred between tropical Asia and Australasia since the middle Eocene except terminal migrations, and the migration events from tropical Asia to Australasia is more than 2 times of the reverse. Only 12 migrations occurred before 15 Ma, whereas the remaining 56 migrations occurred after 15 Ma. Maximal number of potential dispersal events (MDE) analysis also shows obvious asymmetry, with southward migration as the main feature, and indicates the climax of bi-directional migrations occurred after 15 Ma. We speculate that the formation of island chains after the Australian-Sundaland collision and climate changes have driven seed plant migrations since the middle Miocene. Furthermore, biotic dispersal and stable habitat may be crucial for floristic interchange between tropical Asia and Australasia.

Key words: Tropical Asia-Australasia, Floristic interchange, Biogeography, Dispersal, Seed plants