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Amphitropic amphiantarctic disjunctions in Apiaceae subfamily Apioideae

Authors

  • Krzysztof Spalik,

    Corresponding author
    1. Department of Plant Systematics and Geography, Faculty of Biology, Institute of Botany, University of Warsaw, Warszawa, Poland
      Correspondence: Krzysztof Spalik, Department of Plant Systematics and Geography, Institute of Botany, University of Warsaw, Aleje Ujazdowskie 4, PL-00-478 Warszawa, Poland.
      E-mail: spalik@biol.uw.edu.pl
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  • Marcin Piwczyński,

    1. Department of Plant Taxonomy and Geography, Institute of Ecology and Environment Protection, Nicolaus Copernicus University, Toruń, Poland
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  • Clark A. Danderson,

    1. Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
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  • Renata Kurzyna-Młynik,

    1. Department of Plant Systematics and Geography, Faculty of Biology, Institute of Botany, University of Warsaw, Warszawa, Poland
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  • Tiffany S. Bone,

    1. Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
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    • Present address: USDA, NCAUR, BFPM, Peoria, IL, USA.

  • Stephen R. Downie

    1. Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
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Correspondence: Krzysztof Spalik, Department of Plant Systematics and Geography, Institute of Botany, University of Warsaw, Aleje Ujazdowskie 4, PL-00-478 Warszawa, Poland.
E-mail: spalik@biol.uw.edu.pl

Abstract

Aim  Four genera of the plant family Apiaceae subfamily Apioideae –Apium, Chaerophyllum, Daucus and Lilaeopsis– are characterized by amphitropic and amphiantarctic distribution patterns, and in Australasia the subfamily is also represented by the tribe Aciphylleae. We infer the molecular ages of achieving amphitropic distribution for these lineages, reconstruct the biogeographical histories of Apium, Chaerophyllum, Daucus and Lilaeopsis, and identify the sister group of Aciphylleae.

Location  Worldwide, with an emphasis on South America and Australasia.

Methods  Divergence times were estimated employing a Bayesian approach (beast) with fossil pollen of basal apioids as calibration points and using a data set of nuclear ribosomal DNA internal transcribed spacer (nrDNA ITS) sequences from 284 accessions of Apioideae. Additionally, maximum-likelihood analyses were performed for data subsets comprising Apium, Daucus and Lilaeopsis. For Chaerophyllum, maximum-likelihood and beast analyses were carried out using combined chloroplast DNA and ITS data. Biogeographical scenarios were inferred using diva and lagrange.

Results  The sister group to Aciphylleae is the Sino-Himalayan Acronema clade and the divergence between these two lineages is dated at 34.8 Ma, whereas the radiation of Aciphylleae started 11.0 Ma. A Northern Hemispheric origin was inferred for Apium, Chaerophyllum and Daucus, whereas Lilaeopsis probably originated in South America following a dispersal of its ancestor from North America. Chaerophyllum, Daucus and Lilaeopsis dispersed to the Southern Hemisphere at 5.3, 7.0 and 27.9 Ma, respectively. For Apium, two dispersals from Europe were inferred: to South America at 6.3 Ma, and to southern Africa at 3.9 Ma. The taxa migrated along the land masses of North and South America (Daucus, Lilaeopsis) and Africa (Apium) or by direct transoceanic dispersals through the Atlantic (Apium) or the Pacific (Chaerophyllum). Within the Southern Hemisphere they dispersed both westwards (Apium, Daucus, Lilaeopsis) and eastwards (Chaerophyllum, Lilaeopsis). For Chaerophyllum and Lilaeopsis, subsequent dispersal events to the Northern Hemisphere were also inferred.

Main conclusions  Similar timing, contrasted with the diversity of migration routes, suggests that the dispersal events of these umbellifer taxa (and many other amphitropic amphiantarctic genera) were facilitated by favourable ecological conditions in the Southern Hemisphere (climatic cooling of the late Palaeogene/early Neogene) rather than by increased dispersal opportunities.

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