Londo˝o, Camilo , Gˇmez, MarÝa Camila , Cleef, Antoine , Madri˝ßn, Santiago .
P├íramo Floristic Provinces at regional and local scales.
P├íramo is a tropical high elevation ecosystem with a unique and characteristic flora, highly endemic at the specific level and at a local scale. In Colombia, previous P├íramo classifications where based on subjective assessments of species distributions, primarily from the occurrence of taxa in each one of the provinces. The aim of this study is to provide an analytical scenario for the patterns of plant diversity in a hierarchical framework that proposes a possible biogeographical history of the plants. We included the P├íramos from northern Andes (Colombia, Venezuela, Ecuador and Peru) and from the southern mountains of Central America (Costa Rica and Panama). Additionally, a more detailed study at the Colombian local scale treated 35 P├íramo localities. Parsimony Analysis of Endemicity (PAE) and a cluster analysis were applied to a presence/absence data matrix of the P├íramo angiosperm species, both at the regional (five units corresponding to four South American countries plus a fifth that groups Central American P├íramos) and at the local scale (35 units corresponding to Colombian P├íramo complexes). 50% majority rule and a strict consensus trees were obtained for the PAE analysis, and, for the cluster analysis, a Jaccard similarity index was used. As expected, at the regional scale we found a separation between Central American and South American P├íramos. For the Colombian P├íramos, four phytogeographical provinces were delimited with PAE; similar results were obtained from the cluster analysis. The following phytogeographical provinces are proposed for the Colombian p├íramo ecosystem: Macizo Colombiano-Cordillera Central, P├íramos of Antioquia, Sierra Nevada de Santa Marta-Serran├şa del Perij├í, and Cordillera Oriental. These provinces are suggested as the first biogeographical classification for the Colombian P├íramos based on quantitative methods, although, some small areas remain unclassified.
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Laboratorio de Botßnica y Sistemßtica
1 - Universidad de los Andes, Departamento de Ciencias Biolˇgicas, Laboratorio de Botßnica y Sistemßtica, Apartado AÚreo 4976, Bogotß, DC, Colombia
2 - University of Amsterdam, Institute for Biodiversity and Ecosystem Dynamics (IBED), Science Park 904, 1098 HX, Amsterdam, The Netherlands
Parsimony Analysis of Endemicity
Presentation Type: Poster:Posters for Topics
Location: Hall A/Convention Center
Date: Monday, August 2nd, 2010
Time: 5:30 PM