Duabanga (Lythraceae) from the Oligocene of India and its climatic and phytogeographic significance

IF 1.6 4区地球科学 Q2 PALEONTOLOGY

Geobios Pub Date : 2023-06-01 DOI:10.1016/j.geobios.2023.05.003

Harshita Bhatia , Gaurav Srivastava , R.C. Mehrotra

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引用次数: 1

Abstract

Understanding the evolutionary history of biodiversity hotspots has important implications for their future survival. India hosts four biodiversity hotspots: the Western Ghats of South India, the Andaman and Nicobar Islands, the Eastern Himalaya, and the Indo-Myanmar region. Northeast India (NEI) is an important region that hosts 43% of the total plant species occurring in India, of which ∼39% are endemic. This region also acts as a gateway for biotic exchange between India and southeast Asia. The area also receives exceptional rainfall during the pre-monsoon (March to May), in addition to the summer monsoon (June to September) season. In rainforests of NEI, forest-forming plant species make up a large proportion of the biodiversity. Understanding the evolutionary history of rainforests of NEI has implications for the conservation of biodiversity hotspots. Here we report the evergreen rainforest genus Duabanga Buch.-Ham. of the family Lythraceae from the late Oligocene sediments of Assam, NEI. Fossil records of this genus (from south and southeast Asia) suggest its Gondwanan origin, while its modern distribution is dominantly controlled by moisture availability.

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印度渐新世的杜邦加（Lythraceae）及其气候和植物地理意义

了解生物多样性热点地区的进化历史对其未来的生存具有重要意义。印度拥有四个生物多样性热点:南印度的西高止山脉、安达曼和尼科巴群岛、东喜马拉雅和印度-缅甸地区。印度东北部(NEI)是一个重要的地区，拥有印度全部植物物种的43%，其中约39%是特有的。该地区也是印度和东南亚之间生物交流的门户。除了夏季季风季节(6月至9月)外，该地区在季风前(3月至5月)也会有异常降雨。在NEI热带雨林中，成林植物物种占生物多样性的很大比例。了解NEI热带雨林的进化历史对生物多样性热点地区的保护具有重要意义。这里我们报道常绿雨林属Duabanga Buch.-Ham。内印度阿萨姆邦晚渐新世沉积物中的赤藓科植物。该属(来自南亚和东南亚)的化石记录表明其起源于冈瓦纳，而其现代分布主要受水分供应控制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geobios 地学-古生物学

CiteScore

3.30

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： Geobios publishes bimonthly in English original peer-reviewed articles of international interest in any area of paleontology, paleobiology, paleoecology, paleobiogeography, (bio)stratigraphy and biogeochemistry. All taxonomic groups are treated, including microfossils, invertebrates, plants, vertebrates and ichnofossils. Geobios welcomes descriptive papers based on original material (e.g. large Systematic Paleontology works), as well as more analytically and/or methodologically oriented papers, provided they offer strong and significant biochronological/biostratigraphical, paleobiogeographical, paleobiological and/or phylogenetic new insights and perspectices. A high priority level is given to synchronic and/or diachronic studies based on multi- or inter-disciplinary approaches mixing various fields of Earth and Life Sciences. Works based on extant data are also considered, provided they offer significant insights into geological-time studies.