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Niche evolution in a northern temperate tree lineage: biogeographical legacies in cork oaks (Quercus section Cerris)
Swedish Museum of Natural History, Department of Paleobiology. Department of Palaeobiology Swedish Museum of Natural History Box 50007 10405 Stockholm Sweden.ORCID iD: 0000-0001-9535-1206
Unaffiliated , 45100 Orléans , France.
The Morton Arboretum , Lisle, IL 60532-1293 , USA.
Department of Botany and Biodiversity Research, University of Vienna , 1030 Vienna , Austria.
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2023 (English)In: Annals of Botany, ISSN 0305-7364, E-ISSN 1095-8290, Vol. 238, no 6, p. 2668-2684Article in journal (Refereed) Published
Abstract [en]

Background and Aims: Cork oaks (Quercus section Cerris) comprise 15 extant species in Eurasia. Despite being a small clade, they display a range of leaf morphologies comparable to the largest sections (>100 spp.) in Quercus. Their fossil record extends back to the Eocene. Here, we explore how cork oaks achieved their modern ranges and how legacy effects might explain niche evolution in modern species of section Cerris and its sister section Ilex, the holly oaks.

Methods: We inferred a dated phylogeny for cork and holly oaks using a reduced-representation next-generation sequencing method, restriction site-associated DNA sequencing (RAD-seq), and used D-statistics to investigate gene flow hypotheses. We estimated divergence times using a fossilized birth–death model calibrated with 47 fossils. We used Köppen profiles, selected bioclimatic parameters and forest biomes occupied by modern species toinfer ancestral climatic and biotic niches.

Key Results: East Asian and Western Eurasian cork oaks diverged initially in the Eocene. Subsequently, four Western Eurasian lineages (subsections) differentiated during the Oligocene and Miocene. Evolution of leaf size, form and texture was correlated, in part, with multiple transitions from ancestral humid temperate climates to mediterranean, arid and continental climates. Distantly related but ecologically similar species converged on similar leaf traits in the process.

Conclusions: Originating in temperate (frost-free) biomes, Eocene to Oligocene ranges of the primarily deciduous cork oaks were restricted to higher latitudes (Siberia to north of Paratethys). Members of the evergreen holly oaks (section Ilex) also originated in temperate biomes but migrated southwards and south-westwards into then-(sub)tropical southern China and south-eastern Tibet during the Eocene, then westwards along existing pre-Himalayan mountain ranges. Divergent biogeographical histories and deep-time phylogenetic legacies (in cold and drought tolerance, nutrient storage and fire resistance) thus account for the modern species mosaic of Western Eurasian oak communities, which are composed of oaks belonging to four sections.

Place, publisher, year, edition, pages
Oxford University Press, 2023. Vol. 238, no 6, p. 2668-2684
Keywords [en]
Quercus, next-generation sequencing, fossilized birth–death model, fossil, niche evolution, biogeography, leaf lifespan
National Category
Evolutionary Biology Botany Other Earth and Related Environmental Sciences
Research subject
Ecosystems and species history; Diversity of life; The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-5477DOI: 10.1111/nph.18743OAI: oai:DiVA.org:nrm-5477DiVA, id: diva2:1818570
Funder
Swedish Research Council, 2015-03986Swedish Research Council, 2021-05849German Research Foundation (DFG), FZT118Available from: 2023-12-11 Created: 2023-12-11 Last updated: 2023-12-11Bibliographically approved

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