The Atlantic Rainforest is one of the world hotspots and is under pressure from deforestation and fragmentation. The aim of the study was to characterize vegetation structure and natural regeneration in Atlantic Rainforest fragments with different disturbance histories. The sampling areas were: area A, B, E, F, selective logging of wood; area C, tree fall and landslides; area D, conserved and, area G, pasture until the 80s. In each area were allocated plots (5 x 5 m) to tree layer (DBH <5 cm) and the regenerating layer (5 x 1 m), totaling 90 plots in all seven areas. Phytosociological parameters, successional stage, dispersion syndromes and the Shannon-Wiener (H') diversity indexes, Jaccard similarity (Cj), and Pielou (J) fairness were calculated. The seven sampled areas are similar in relation to floristic composition of the tree and regenerating layer. There is greater similarity between areas D, E, G and A. The differences found were in the forest structure (density and dominance). The families with the highest diversity were Fabaceae, Euphorbiaceae and Ochnaceae. The highest H' occurred in area A and C. Area D (lower degree of disturbance) showed high H', indicating a higher equilibrium. Although area G has been pasture in the past, it is noticeable that it presented good recovery capacity when compared to area D. Area A presented the largest ecological group of species, such as Trichilia elegans and Trichilia claussenii. Zoocoria was the predominant dispersion syndrome for the species studied.

02 - STRUCTURE AND SUCESSIONAL DYNAMICS IN ATLANTIC RAINFOREST FRAGMENTS WITH DIFFERENT DISTURBANCE HISTORIES IN THE SOUTH CENTRAL REGION OF SÃO PAULO STATE, BRAZIL