Systematics/Phytogeography / Taxonomie/ Section
Fisher, Amanda E. , Clark, Lynn G. , Kelchner, Scot A. .
A first look at the phylogeny and biogeography of Chusquea (Poaceae: Bambusoideae): inference from four chloroplast noncoding regions.
Chusquea¬†is the worldís 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.
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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
Presentation Type: Oral Paper:Papers for Sections
Date: Tuesday, July 29th, 2008
Time: 10:30 AM