Was analyzed ethnoecology aspects of the tree species in 2 ha of floodplain forest on the island of Sororoca, municipality of Ananindeua, state of Pará. The floristic was assessed through floristic inventory in eight plots of 50 x 50 m, which were measured all trees with diameter at breast height (DBH) ≥10 cm to 1.30 m and calculated the relative density, relative frequency, relative dominance value indices of importance and coverage. Information on the use, management and season of use were obtained through interviews with local residents. The results showed 3.054 individuals in 20 families, 47 genera and 53 species. Fabaceae and Arecaceae stood out with the greatest number of species. Euterpe oleracea represented 69.01% of the individuals identified, with the largest number of individuals, relative dominance, importance value index and value index coverage. The main use of 49 species concentrated on the craft category. The months January to April amounted to the time of use and management of the species coincides with the rainy season the level of precipitation and relative humidity higher.
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