Recent Topics Posters
Gómez, María Camila , Richardson, James , Saarela, Jeffery M. , Peterson, Paul M. , Madriñán, Santiago .
Phylogeny and Biogeography of Calamagrostis páramo species (Poaceae: Pooideae)
PÃ¡ramo is known as the most biodiverse high elevation ecosystem, it is located in northern South America and southern Central America, between 3200 and 4200 meters over the sea level. Its dry mountain slopes are covered by extensive grasslands dominated by species of the genus Calamagrostis Adans. (Poaceae: Pooideae). This member of the grass family has a wide temperate distribution in the north hemisphere, going southward by the mountain ranges of Central America until the south of the continent. We obtained ITS sequences for 49 species of the genus Calamagrostis and proposed a phylogenetic hypothesis under maximum parsimony criterion and Bayesian inference. Likewise, we employed Bayesian methods for dating the obtained phylogeny. Our results show that the genus Calamagrostis is not a monophyletic group, and neither are the PÃ¡ramo representatives. These are nested in two clades, a first one constituted by species with a holarctic distribution, and, a second one, constituted by species with Central American distribution. Also, the radiation of both corresponds to the big mid-Miocene radiation of the subfamily Pooideae (ca 9 million years ago). Additionally, Calamagrostis PÃ¡ramo species might have arrived at least twice at the beginning of the Pliocene, the subsequent colonization of the PÃ¡ramo ecosystem might have occurred in a progressive manner, employing the Andes Mountain Range as a corridor, taking advantage of the formation of new habitats in the tropics with similar conditions to the ones in temperate zones.
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1 - Universidad de los Andes, Departamento de Ciencias Biológicas, Laboratorio de Botánica y Sistemática, Apartado Aéreo 4976, Bogotá, DC, Colombia
2 - Royal Botanical Garden Edinburgh, 20a Inverleith Row, Edinburgh, EH3 5LR, United Kingdom
3 - Canadian Musuem of Nature, Research Division, P.O. Box 3443, Station D, Ottawa, ON, K1P 6P4, Canada
4 - Smithsonian, Botany, National Museum of Natural History, Washington, DC, 20013-7012, USA
Presentation Type: Recent Topics Poster
Location: Hall A/Convention Center
Date: Monday, August 2nd, 2010
Time: 5:30 PM