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The Primeiras and Segundas Archipelago Reserve is a recently established marine protected area, the largest in Africa, located in thewaters of Northern Mozambique. This protected area is of significant local economic importance and global ecological relevance,containing the southernmost coral reefs in Eastern Africa. However, information related to the marine ecosystem, notably benthichabitat is very scarce. Twelve atolls were mapped in the region using object-based image classification of very-high resolutionsatellite imagery (IKONOS, Quickbird, and WorldView-2). Geographically referenced data on benthic cover and depth weregathered in the course of three fieldwork expeditions covering a total of four atolls and two shallow reef structures in the SegundasArchipelago. The resulting map allows the estimation of three distinct types of coral cover (field, patches, spurs and grooves); thedifferentiation of sand, rubble and rock substrate; and the detection of seagrass and brown macroalgae, identifying up to 24 benthichabitats. Average overall accuracy was above 50%. The high variability of the optical properties on the reef systems, in large due tothe connectivity with the mainland via plumes, while interesting from an ecological perspective increases the challenges for remotesensing of bottom cover. New information indicates the presence of deep benthic cover extending from the atolls, suggesting theneed for further research on Coastal Eastern African corals, namely on their resilience and connectivity, and supporting currentknowledge of the existence of an almost continuous coral reef from Kenya to Mozambique. Coral and fish biodiversity data havebeen analysed together with the satellite-derived maps. Results support the local perception that ecosystems are in decline anduncover new information about biodiversity’s spatial patterns. Our work provides a detailed depiction of marine habitats that mayaid the management of the protected area, namely in the definition of fishing zones and coral cover monitoring

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

BENTHIC HABITAT MAPPING AND BIODIVERSITY ANALYSIS IN THE PRIMEIRAS AND SEGUNDAS ARCHIPELAGO RESERVE