%0 Journal Article
%T Spatial-functional pattern of ecotonal riparian landscapes on Meridional Plateau, Southern Brazil Patrones espacio-funcionales de paisajes ribere os ecotonales en el Plat車 Meridional, en el sur de Brasil
%A Tiaro Katu Pereira
%A Rosemeri Segecin Moro
%J Bosque (Valdivia)
%D 2012
%I Universidad Austral de Chile
%X This study analyzes the Pitangui and Jotuba riparian zonesinthe Meridional Plateau, to create a landscape model of forest/field riparian ecotones. The areas were delineated from 2001 orthophotos (1:10,000), including all native vegetation in flooding limits of the lotic channels. The landscape units (UP) were represented by the Alluvial Ombrophilous Mixed Forest metacommunity (FOMA) including as phytocoenosis both the riparian woody forest (FR) and hydrophilous vegetation (VH). Landscape metrics and statistical treatment were used to characterize landscapes and patches. To evaluate the FR patches we presumed a 30 m edge. The Pitangui River (1,072 ha) has double the riparian area of Jotuba River (539 ha), although proportionally both were UPs equivalent (40 % of FR and 60 % of VH). Both rivers have a large number of small rounded patches and relatively few large areas that trend to more complex and irregular shapes as the area increases. Also smaller patches are more spatially heterogeneous than the larger ones, and more aggregated along the river channel. 60 % of FR area on both rivers is under an edge effect: Pitangui has 91 core areas linked by 69 corridors and the Jotuba River has 53 core areas with 47 corridors. In the riparian zones, VH areas occupy the flood plains showing higher variability in size and spatial distribution. This summarizes the natural fragmentation of the riparian vegetation of regional rivers in Southern Brazil. Este estudio analiz車 las zonas ribere as de Pitangui y Jotuba en el Plat車 Meridional con el fin de crear un modelo de paisaje para ecotonos ribere os de bosques/pradera. Las zonas fueron delimitadas con ortofotos de 2001 (1:10.000), incluyendo toda vegetaci車n nativa en los l赤mites de inundaciones de los canales l車ticos de los r赤os Pitangui y Jotuba. Las unidades de paisaje (UP) estuvieron representadas por la meta comunidad de bosques mixtos aluviales ombr車filos (FOMA) con fitocenosis del bosque ribere o (FR) y vegetaci車n hidr車fila (VH). Se utilizaron m谷tricas de paisaje y herramientas estad赤sticas para caracterizar los paisajes y los fragmentos. Para la evaluaci車n de FR se asumi車 un borde de 30 metros. El r赤o Pitangui (1.072 ha) present車 el doble de la zona ribere a que el r赤o Jotuba (539 ha), aunque proporcionalmente ambos eran equivalentes UP (40 % de FR y 60 % de VH). Ambos r赤os tienen gran n迆mero de peque os fragmentos redondeados y relativamente pocas 芍reas grandes tendiendo a formas m芍s complejas e irregulares al aumentar el 芍rea. Los fragmentos m芍s peque os fueron espacialmente m芍s heterog谷neos que los mayores y
%K ecolog赤a de paisaje
%K Campos Gerais
%K m谷tricas de paisaje
%K fragmentaci車n natural
%K landscape ecology
%K Campos Gerais
%K landscape metrics
%K natural fragmentation
%U http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-92002012000300023