%0 Journal Article
%T Woodland communities in the Chilean cold-temperate zone (Baker and Pascua basins): Floristic composition and morpho-ecological transition Comunidades le osas en la zona chilena fr赤o-templada (cuencas de los r赤os Baker y Pascua): Composici車n flor赤stica y transici車n morfo-ecol車gica
%A OSVALDO J VIDAL
%A JAN R BANNISTER
%A V赤CTOR SANDOVAL
%A YESSICA P谷REZ
%J Gayana. Botanica
%D 2011
%I Universidad de Concepci車n
%X This study describes the floristic composition and morpho-ecological transition of woodlands along a climatic gradient in the southern cold temperate zone of Chilean Patagonia. A total of 256 phytosociological relev谷s were performed across a 150 km NE-SW transect to record vascular plant species. Classification (cluster analysis) and ordination (principal component analysis) techniques were used to segregate and examine the communities. Biodiversity indicators including richness and abundances of species natives and exotics, importance values, Raunkiaer plant life-forms, diversity indices and indicator species were calculated to describe community attributes. Beta diversity was analysed using the Jaccard index. Additionally, the current anthropogenic disturbances affecting this vegetation are discussed. In total, 11 woodland communities belonging to 3 morpho-ecological groups were segregated: a) meso-hygromorphic woodlands belonging to the Baker basin, mostly composed of deciduous forests containing relatively moderate values of richness and diversity but high richness of exotics, b) hygromorphic woodlands belonging to the southern segment of the Baker basin and along the Pascua basin, composed of evergreen forest containing the relatively highest values of richness and diversity and very low richness of exotics and c) high-Andean dwarf woodlands distributed at high elevations in both basins, composed of deciduous krummholz containing the lowest richness and diversity and no exotics. The replacement of deciduous by evergreen communities at low elevations occurs around the latitude 48∼S. Anthropogenic disturbances like logging by rural landowners, overgrazing by livestock and road construction are promoting biological invasions in the Baker basin forests, while the forests in the Pascua basin remain pristine since no human population occurs there Este estudio describe la composici車n flor赤stica y la transici車n morfo-ecol車gica de las comunidades le osas ocurriendo a trav谷s de un gradiente clim芍tico en la zona templada fr赤a de la Patagonia chilena. Se establecieron un total de 256 relevamientos fitosociol車gicos a trav谷s de un transecto NE-SO de 150 km para registrar las especies de plantas vasculares. T谷cnicas de clasificaci車n (an芍lisis de conglomerados) y ordenaci車n (an芍lisis de componentes principales) fueron usadas para segregar y examinar comunidades. Se computaron indicadores de biodiversidad incluyendo riqueza y abundancia de especies nativas y ex車ticas, valores de importancia, formas de vida de Raunkiaer, 赤ndices de diversidad y especies indicadoras p
%K Transici車n biogeogr芍fica
%K zona templada fr赤a
%K perturbaciones antr車picas
%K bosques pr赤stinos
%K Ays谷n
%K Biogeographical transition
%K southern cold temperate zone
%K anthropogenic disturbances
%K pristine forests
%K Ays谷n
%U http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200004