Manguezais Paraenses: Análise de impactos antrópicos ao longo da estrada Bragança - Ajuruteua (município de Bragança, Pará)

Abstract

The northeast coast of Pará presents a succession of estuaries and peninsulas covered by mangroves. This ecosystem is in a good state of conservation, except along the road connecting the city of Bragança to Ajuruteua beach (36 km long, municipality of Bragança) where anthropogenic impacts created by the construction of the highway can be observed. After a review of the reference bibliography, field work was done to collect sediments with a mud auger and geomorphological reconnaissance with satellite scenes. The samples were analyzed in the laboratory of the CCTE, using traditional practices (crushing, sieving, granulometric analysis ...) and obtaining graphs and tables. The work was complemented by the initiation to remote sensing and training for map digitization. The sediments analyzed are typical of mangroves, with a clayey texture and low proportion of silt. In the vicinity of Ajuruteua beach one can observe sandy accumulations characteristic of beach environments. The Bragança peninsula represents a characteristic feature of the Paraense riffle coast, with numerous relicts between Salinas and the Maranhão border. The interest of the study of the sector is to observe directly in the field the consequences of an anthropic action that destructures the ecosystem. This action is all the more serious in view of the recognized sensitivity of the ecosystem to natural impacts and its vulnerability to anthropic actions, especially in view of the socioeconomic function of mangroves for traditional populations.