Ormosia (Fabaceae: Faboideae) from the Miocene of southeastern China support historical expansion of the tropical genus in East Asia
Ormosia (Fabaceae: Faboideae) from the Miocene of southeastern China support historical expansion of the tropical genus in East Asia
复制标题
来自中国东南部中新世的红豆属（豆科：Fabaceae）支持东亚热带属的历史扩张
DOI：
10.1080/08912963.2021.1877700
复制
发表时间：
2021-02-27
影响因子：
1.4
通讯作者：
Sun, Bai-Nian
中科院分区：
文献类型：
--
作者：
Li, Xiang-Chuan;Manchester, Steven R.;Sun, Bai-Nian
摘要渐新世至中新世，亚洲季风气候的发展引发了植被带的纬向变化。然而，对中国亚热带等重要地区高温植物区系对地质事件的响应历史却知之甚少。本文报道了豆科红豆属（Ormosia cyclocarpa sp. nov.）根据中国中亚热带浙江中新世保存完好的果实，本种的特征是开裂，压扁的近圆形的单种子豆荚具一边缘内脉。广泛的比较与现存的/化石豆科类群自信地支持目前的分类考虑。考虑到现存的分布、多样性中心和区域气候历史，中国南方已知的化石分布表明，红豆树在中新世期间从可能的起源热带向北延伸到亚热带中国，那里曾经是广阔的纬度干旱区，贯穿了古近纪的大部分时间。中国热带-亚热带植物地理格局的这种变化可能是渐新世-中新世界线附近东亚气候剧烈变化的结果，并与中新世早中期气候变暖密切相关。红豆属和其它热带属（如龙脑香属、滨藜属、羊蹄甲属、泪果属）在中国亚热带地区的分布，表明现存的东亚植物群的某些分支起源于古热带和中新世。
ABSTRACT The development of the Asian monsoonal climate sparked a latitudinal shift in vegetation zones from the Oligocene to the Miocene. However, little is known about the history of the megathermal floristic response to the geologic events in key regions like subtropical China. Here, a species of Fabaceae, Ormosia cyclocarpa sp. nov., is recognised based on well-preserved fruits from the Miocene of Zhejiang in middle-subtropical China. This species features dehiscent, compressed suborbicular single-seeded pods with an intramarginal vein. Extensive comparisons with extant/fossil fabaceous taxa confidently support the present taxonomic consideration. Considering the extant distribution, diversity centre and regional climate history, the known fossil occurrences in southern China imply that Ormosia extended northwards during the Miocene from probable tropics of origin into subtropical China, where a once broad latitudinal arid zone prevailed throughout much of the Palaeogene. Such a changing phytogeographic pattern across tropical-subtropical China probably resulted from a drastic East Asian climate change around the Oligo-Miocene boundary, and closely coincided with the early-middle Miocene warming. The spreading of Ormosia and other tropical genera (e.g. Dipterocarpus, Shorea, Bauhinia, Dacrycarpus) sharing similar floristic history in subtropical China indicates a palaeotropical and Miocene origin for some clades of the extant East Asian flora.