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Community assembly of tropical Fagaceae-dominated forests in Thailand dates back at least to the Late Palaeogene
Division of Biological Science, Faculty of Science, Prince of Songkla University , Hatyai, Songkhla, 90110 , Thailand.
Department of Botany and Biodiversity Research, University of Vienna , Vienna , Austria.
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0001-9535-1206
Division of Health and Applied Sciences, Faculty of Science, Prince of Songkla University , Hatyai, Songkhla, 90110 , Thailand.
2023 (English)In: Botanical journal of the Linnean Society, ISSN 0024-4074, E-ISSN 1095-8339, Vol. 202, no 1, p. 1-22Article in journal (Refereed) Published
Abstract [en]

The Late Oligocene to Early Miocene flora of the Ban Pa Kha Subbasin (Li Basin, northern Thailand) provides a record of montane dry tropical oak-pine forests. The rich ensemble of Fagaceae typical of these forests might have existed in the wider region of Southeast Asia since Eocene times and various fossil plant assemblages represented both lowland (Fagaceae, Dipterocarpaceae) and upland (Fagaceae, Pinaceae) tropical forests. These findings are in conflict with previous interpretations of vegetation development in northern Thailand, which stressed that stratigraphically older (possibly Late Oligocene) spore and pollen assemblages in northern Thailand were markedly different from the modern tropical flora and had a distinct northern temperate character. A major change in climate would have caused a dramatic shift to tropical conditions since the Mid-Miocene. Considering palaeobotanical data from adjacent regions in Southeast Asia, we suggest that differences in spore and pollen assemblages in intermontane basins in northern Thailand are more likely to represent different facies and lowland/upland settings. Assembly of these forest ecosystems, typically comprising Quercus sections Cyclobalanopsis, Ilex and Quercus, pollen of Castaneoideae with affinities to Castanopsis and Lithocarpus, and extinct fagaceous genera such as Eotrigonobalanus, most probably dates back to the Eocene. The absence of oaks of Quercus section Cerris in the spore and pollen assemblage of the Ban Pa Kha Subbasin, despite this group being part of the modern vegetation, might reflect the late arrival (secondary radiation) of this chiefly temperate group in tropical Southeast Asia.

Place, publisher, year, edition, pages
Oxford University Press, 2023. Vol. 202, no 1, p. 1-22
Keywords [en]
Castaneoideae, fossils, Miocene, Oligocene, pollen, Quercus
National Category
Evolutionary Biology Other Earth and Related Environmental Sciences
Research subject
The changing Earth; Ecosystems and species history
Identifiers
URN: urn:nbn:se:nrm:diva-5480DOI: 10.1093/botlinnean/boac075OAI: oai:DiVA.org:nrm-5480DiVA, id: diva2:1818600
Funder
Swedish Research Council, 2021-05849
Note

This project was funded by the Prince of Songkla University, Thailand (project number SCI 6402006S), the Swedish Research Council (VR, grant number 2021-05849) and ASEA-UNINET Staff Exchange, One Month Scholarship 2017

Available from: 2023-12-01 Created: 2023-12-11 Last updated: 2023-12-11Bibliographically approved

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