ESPÉCIES ARBÓREAS DE UM TRECHO DE FLORESTA ATLÂNTICA DO MUNICÍPIO DE ANTONINA, PARANÁ, BRASIL

Tree species from an Atlantic Forest remnant in Ant onina, Parana, Southern Brazil. Aiming to support new vegetation dynamics and climate change studies, a floristic survey of the tree species was conducted in the Atlantic Forest at Rio Cachoeira N atural Reserve, in Antonina municipality, Southern Brazil. The survey was intensified in 187 permanent plots, representing 23.5 ha of sampled area. The floristic collection was represented by 3 06 tree species, distributed in 68 families. Zoocho ry was the most common dispersion syndrome (81.7%). According to the shadow tolerance, 50.3% of the species were tolerant, while non-tolerant speci es were 49.7%. Wide geographical distribution species represented almost half of all this florist ic set (48.4%).Threatened species were 6.9% of all species found (21), a higher value than that one re ported to other studies on this forest type (around 2%). This situation shows the effects of continuous pressure on the forest, as the over exploitation o f the vegetation through the years, associated to the forest damage by fragmentation and habitat loss process leads to the higher risks for species conse rvation on this biome.