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New Fagaceous pollen taxa from the Miocene Søby flora of Denmark and their biogeographic implications
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0001-9535-1206
2021 (English)In: American Journal of Botany, ISSN 0002-9122, E-ISSN 1537-2197, Vol. 108, p. 1500-1524Article in journal (Refereed) Published
Abstract [en]

Premise: The Fagaceae comprise around 1000 tree species in the Northern Hemisphere.Despite an extensive fossil pollen record, reconstructing biogeographic patternsis hampered because it is difficult to achieve good taxonomic resolution withlight microscopy alone. We investigate dispersed pollen of Fagaceae from the Miocene Søby flora, Denmark. We explore the latitudinal gradient in Fagaceae distribution during the Miocene Climatic Optimum (MCO) in Europe and the Northern Hemisphere to compare it with the Eocene Warmhouse and the present.

Methods: We investigated dispersed pollen using light and scanning electron microscopy. We assessed biogeographic patterns in Fagaceae during two warm periods in Earth history (MCO, Eocene) and the present.

Results: Eight species of Fagaceae were recognized in the Søby flora. Of these, Fagus had a continuous Mediterranean to subarctic distribution during MCO; Quercus sect. Cerris and castaneoids had northern limits in Denmark, and evergreen Quercus sect. Ilex in Central Europe. In a northern hemispheric context, Fagus and sections of Quercus had more northerly distribution limits during Eocene and MCO with maximum northward extensions during Eocene (Fagus, castaneoids) or Oligo‐Miocene (Quercus sects. Cerris and Ilex). The known distribution of the extinct Tricolporopollenites theacoides during MCO included Central Europe and East China, while this taxon thrived in South China during Eocene.

Conclusions: More northerly distributions during MCO and Eocene probably were determined by temperature. In contrast, fossil occurrences in areas that are arid or semi‐humid today were determined by maritime conditions in these areas (western North America, Central Asia) during the Cenozoic.

Place, publisher, year, edition, pages
John Wiley & Sons, 2021. Vol. 108, p. 1500-1524
Keywords [en]
Fagus, Fususpollenites fusus, middle Miocene, Northern Hemisphere, paleobotany, paleopalynology, Quercus, scanning electron microscopy, Tricolporopollenites pseudocingulum, Tricolporopollenites theacoides
National Category
Other Earth and Related Environmental Sciences
Research subject
Ecosystems and species history; The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-4500DOI: 10.1002/ajb2.1716OAI: oai:DiVA.org:nrm-4500DiVA, id: diva2:1618544
Funder
Swedish Research Council, 2015‐ 03986Available from: 2021-12-09 Created: 2021-12-09 Last updated: 2021-12-13Bibliographically approved

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Denk & Bouchal 2021_Fagaceae Söby(10990 kB)121 downloads
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Publisher's full texthttps://doi.org/10.1002/ajb2.1716

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