| Summary: | The Environmental Sensitivity Index Maps for Oil Spills (ESI Maps, or SAO inPortuguese) constitute an essential component and source of basic information for emergency planning, response decision support and damage evaluation in case of oil spills. This studyaims at the elaboration of sensitivity maps for oil spills for the islands within the Ubatubamunicipality, north coast of the State of São Paulo. The adopted methodology is based on theTechnical Specifications for the production of Environmental Sensitivity Maps for oil spills(SAO maps) proposed by the Brazilian Ministry of Environment. The study involved thegathering of secondary data, followed by field work carried out in the summer and winterperiods of 2007; the elaboration of the cartographic base maps and, finally, the integration ofthe data to a GIS (Geographic Information System). As a result it was registered and mappedthe physical (geology, geomorphology, oceanography and climatology), biological (fauna,flora and coastal environments) and socioeconomic (anthropic influence, human use, artificialstructures and impacts) resources of Ubatuba coastal islands. Eleven beaches have beenidentified, located at six islands, with distinct topographic and geomorphologic features. Thebeaches were classified with sensitivity index 4, because they are sheltered from actions ofwaves and currents. Most of the mapped environments (44.8%) were classified withsensitivity index 8, indicating high sensitivity of the islands. The oil spill impacts on coastalenvironments can be significantly minimized during the contingency actions when previousknowledge of the ecosystems that compose the islands environment is available, especiallywhen it is integrated into GIS data basis, capable of displaying easy-to-use maps. Theenvironmental sensitivity mapping is an important management instrument, especially whendealing with sensible and poorly studied areas such as the islands of Ubatuba.
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