期刊
PLANT DIVERSITY
卷 43, 期 6, 页码 480-491出版社
KEAI PUBLISHING LTD
DOI: 10.1016/j.pld.2020.12.0062468-2659
关键词
8 December 2020; Asia; Bering land bridge; Biogeography; Middle Miocene; Malvaceae
资金
- National Natural Science Foundation of China [31900194]
- Foundation of the State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences [183112]
- Yunnan Province Natural Science Foundation [2019FB061]
- Youth Innovation Promotion Association, CAS [2017439]
Paleobotanical studies of fossils from South Korea in the middle Miocene reveal that mesothermal plants like Firmiana and Tilia endochrysea had distributions extending northward from Asia, but were still geographically distant from the Bering land bridge. This suggests that some mesothermal plants adjacent to the land bridge may have been able to utilize it as a migratory corridor, while others may have been ecologically restricted from crossing it.
Determining whether the high-latitude Bering land bridge (BLB) was ecologically suitable for the migration of mesothermal plants is significant for Holarctic phytogeographic inferences. Paleobotanical studies provide a critical source of data on the latitudinal positions of different plant lineages at different times, permitting assessment of the efficacy of the BLB for migration. Here we report exceptionally preserved fossils of Firmiana and Tilia endochrysea from the middle Miocene of South Korea. This represents a new reliable record of Firmiana and the first discovery of the T. endochrysea lineage in the fossil record of Asia. The occurrence of these fossils in South Korea indicates that the two lineages had a distribution that extended much farther north during the middle Miocene, but they were still geographically remote from the BLB. In light of the broader fossil record of Asia, our study shows that, in the middle Miocene, some mesothermal plants apparently inhabited the territory adjacent to the BLB and thus they were possibly capable of utilizing the BLB as a migratory corridor. Some other mesothermal plants, such as Firmiana and the T. endochrysea lineages, however, are restricted to more southern regions relative to the BLB based on current fossil evidence. These lineages may have been ecologically unable to traverse the BLB, which raises questions about the efficacy of the BLB as a universal exchange route for mesothermal plants between Asia and North America during the middle Miocene. Copyright (c) 2020 Kunming Institute of Botany, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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