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Human populations interact with natural ecosystems and develop practices for the use of natural resources and from their daily experiments generate empirical knowledge. The research aimed to systematize the knowledge about the açaí ethnovarieties present in the Abaetetuba Islands PA and the management carried out by riverside dwellers in the floodplain areas with native açaizais to contribute to the dialogue between technical assistance agents and the riverside residents. In the surveyed islands, three black, white and one ethnovarieties were identified. The description of ethnovarieties was carried out based on the ethnodescriptors commonly used by riverside dwellers. The research located the origin of the genetic resources of the three ethnovarieties of açaí and this information can be used by research and technical assistance as an instrument of genetic conservation on farm. It was found that the riverside inhabitants of the main açaí producing islands in the municipality of Abaetetuba are not receiving technical assistance to carry out the management of the açaizais. [ABSTRACT FROM AUTHOR]