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| 1 | Fossil fruits of Firmiana and Tilia from the middle Miocene of South Korea and the efficacy of the Bering land bridge for the migration of mesothermal plants显示文摘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. | Lin-Bo Jia Gi-Soo Nam Tao Su Gregory W.Stull Shu-Feng Li Yong-Jiang Huang Zhe-Kun Zhou | 2021 | Plant Diversity2021，43，6： | 1 |
| 2 | 大荫山米槠林群落主要乔木种群生态位研究显示文摘2018年7月,运用Shoener的生态位相似性比例公式、Pianka的生态位重叠公式以及Shannon-wiener和Levins的生态位宽度公式,对衢州市柯城区大荫山米槠Castanopsis carlesii林群落及其主要乔木种群的生态位进行了研究。结果表明,调查区域内共有植物117种,其中乔木24种、灌木75种、草本18种;米槠、杜英Elaeocarpus decipiens、台湾冬青Ilex formosana是具有明显优势的主要乔木种群,这些优势种群的生态位宽度较大;米槠-台湾冬青种群之间的生态位相似性比例和生态位重叠值最大。本研究通过讨论周围环境资源利用现状及其之间相互的关联对主要植物群落的影响,从而为更有效地保护大荫山米槠林群落提供理论依据。 | 徐小源 哀建国 黄一芳 | 2021 | 浙江林业科技2021，41，3： | 0 |
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