Araçá is a small bay with hydrodynamic dominated by tides, bordered by rocky flanks, that covers four beaches, three sections of mangrove forests and a soft-bottom plain (Amaral et al, 2010). Araçá, as well as the entire northern coast of São Paulo / Brazil, is immersed in an intense context of socio-economic and environmental changes, resulting from economic growth policies related to energy, infrastructure and logistics. Nowadays, the expansion of the port of São Sebastião at Araçá stands out, which will provide an area increase of 600.000,00m² (CPEA, 2011) with the deletion of local coastline areas from Araçá bay, significantly changing the hydrodynamics and the socio-ecological processes that depend on it. In this context The Multiscale Integrated Model of Ecosystem Services – MIMES / Araça will be developed, which aims to dynamically evaluate the interactions and feedback relationships of human and natural systems of the region. The model covers the southeastern portion of the sub-basins of São Sebastião County and the northwest portion of the city of Ilhabela, besides the São Sebastião channel. The purpose of modeling comes from the framework developed by Boumans et al (2015) that relies on dynamic models of explicitly specialized systems, supported by GIS data. Thus, an array/matrix of the relationships between human and natural systems in the area was developed. Within the human dimension, the components of local economic systems, institutions, population dynamics, and the projects related to infrastructure were identified. In the environmental dimension, the physical and biotic aspects of marine ecosystems, mangroves and land were identified. It was possible to identify key ecosystem services provided by the environment and its direct beneficiaries from the crossing, defining the basis of the conceptual model of relations between the different compartments for the construction of Araçás MIMES model.
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