| Abstract Detail
Systematics Harrower, Emma [1], Matheny, Brandon [2]. Evolution and phylogeography of the Cortinarius violaceus group in Australasia and the Americas. We present a multi-gene phylogeny (ITS, LSU, RPB2) of the mushroom clade Cortinarius sect. Cortinarius (C. violaceus group) that reveals eight different species distributed in Australasia, South America, Central America, North America and Europe. A relaxed molecular clock analysis suggests that diversification initially occurred during the Miocene, thus rejecting any possible ancient or Gondwanan biogeographic scenarios among the widely distributed taxa. There is strong support for an Australasian origin with dispersal to South America followed by migration 6-12 Mya into North America and Europe, which coincides with the "great American interchange". A dispersal-extinction cladogenesis model that includes a parameter for founder effects is the most highly supported among all available biogeographic models in the program BioGeoBEARS. A maximum likelihood analysis shows that the most recent common ancestor of sect. Cortinarius most likely was an angiosperm associate. Ancestral associations at the plant family level, however, are ambiguous. Of eight recovered species-level lineages, C. violaceus is the only one that associates with Pinaceae and the only species to associate with both Pinaceae and angiosperms. This analysis shows that long-distance dispersal has been an important factor during evolution of the C. violaceus group.
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1 - University of Tennessee, 569 Dabney Hall, Knoxville, TN, 37996-1610, USA
2 - University of Tennessee, Ecology & Evolutionary Biology, 332 Hesler BIology Building & Greenhouse, Knoxville, TN, 37996, USA
Keywords:
none specified
Presentation Type: Offered Paper - Paper
Session: 14
Location: Room 103 AB/Kellogg Hotel and Conference Center
Date: Wednesday, June 11th, 2014
Time: 11:30 AM
Number: 14005
Abstract ID:257
Candidate for Awards:None |
