| Abstract Detail
Systematics/Phytogeography / Taxonomie/ Section Fisher, Amanda E. [1], Clark, Lynn G. [2], Kelchner, Scot A. [1]. A first look at the phylogeny and biogeography of Chusquea (Poaceae: Bambusoideae): inference from four chloroplast noncoding regions. Chusquea is the world’s largest genus of bamboos with over 140 described species and centers of diversity in south-eastern Brazil, the Andes, and Central America. Most occupy disjunct montane forest habitats, although members of subgenus Swallenochloa are endemic to the high altitude Andean meadows called paramos. Monophyly of the genus has been tested both in relation to its sister group, Neurolepis, and to the temperate and paleotropical woody bamboos. Presented here is a preliminary phylogeny estimation of Chusquea based on four chloroplast noncoding regions: rpl16 intron, trnD-trnT intergenic spacer, trnT-trnL intergenic spacer, and ndhA intron. Sampling consisted of 50 taxa, representing the diversity of Chusquea morphology and distribution. Maximum parsimony, maximum likelihood and bayesian methods of phylogenetic analysis were employed to test robustness of the topology. The Shimodaira-Hasegawa test was used to assess whether current classification of subgenera reflect natural lineages as evidenced by the chloroplast genomes. Monophyly of the subgenus Rettbergia was well supported but monophyly was not supported for subgenera Chusquea and Swallenochloa. The validity of several informal groups defined by morphology was also called into question. The chloroplast phylogeny estimation points to a correlation between geography and evolutionary history. The biogeography of Chusquea, particularly the spread of taxa into high altitude environments will be discussed.
Log in to add this item to your schedule
1 - Idaho State University, Department of Biological Sciences, Campus Box 8007, Pocatello, Idaho, 83209, USA
2 - Iowa State University, Department of Ecology, Evolution & Organismal Biology, 253 Bessey Hall, Ames, Iowa, 50011-1020, USA
Keywords:
Chusquea
Bambusoideae
chloroplast DNA
phylogeny.
Presentation Type: Oral Paper:Papers for Sections
Session: 36
Location: 157/Law
Date: Tuesday, July 29th, 2008
Time: 10:30 AM
Number: 36010
Abstract ID:93 |
