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Abstract Detail


Fisher, Amanda [1], Clark, Lynn [2], Kelchner, Scot A. [1].

Andean radiation of the genus Chusquea (Poaceae: Bambusoideae: Bambuseae).

A recent phylogeny estimation of the woody bamboo genus Chusquea recovered four major, well supported clades: Neurolepis I, Neurolepis II, Rettbergia, and Euchusquea. Subsequent analysis focused on the Euchusquea clade and found unexpectedly low genetic variation across multiple loci (both plastid and nuclear) and was unable to convincingly resolve relationships in this species rich lineage. Chusquea contains approximately 160 described species and has a wide distribution in the neotropics. All four lineages have radiated into montane habitats in the Northern Andes, Central America, Mexico, or the Austral Andes, and there have been multiple introductions to southeastern Brazil. At least forty Chusquea species in the Neurolepis I, Neurolepis II and Euchusquea clades are found in open habitats, including high elevation paramos, campos de altitude and campo rupestre. In several cases, montane taxa may have subsequently given rise to low elevation radiations. BEAST estimates of divergence times place Chusquea lineage crown nodes in the early Pliocene or late Miocene, coincident with uplift events in the Northern Andes. The large number of described Andean Chusquea, coupled with an inferred recent origin of the group, results in an exceptional speciation rate. Chusquea bamboos are unusual in comparison to other recent Andean plant radiations (e.g., Espeletia, Fuchsia, Halenia, Jamesonia, Lupinus, and Macrocarpaea) in that Chusquea is anemophilous and a majority of species experience long generation times.

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1 - Idaho State University, Department of Biological Sciences, 921 South 8th Avenue, Stop 8007, Pocatello, ID, 83209-8007, USA
2 - Iowa State University, Department of Ecology, Evolution and Organismal Biology, 253 Bessey, Ames, IA, 50011-1020, USA

molecular dating.

Presentation Type: Oral Paper:Papers for Topics
Session: 05
Location: Lindell A/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 9:00 AM
Number: 05003
Abstract ID:308

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