A combined approach of benthic mapping of Caraguatatuba Bay, Brazil, with recommendations for management practices

Benthic habitat mapping is an important first step towards ecosystem-based management. In a top-down approach, benthic mapping of a semi-enclosed bay in south-eastern Brazil was performed using a combined approach of acoustic RoxAnn survey and benthic samples. An inventory of the benthic macrofauna as well as unsupervised classifications of the acoustic data provided information about sediment patterns and potential areas of ecological importance, and a new zoning scheme is suggested based on the macrofauna analysis. The RoxAnn survey proved suitable to determine sediment characteristics, however, species–environment relationships cannot be revealed by acoustic techniques only. Based on the data presented here, acoustic surveys could become an important tool in future monitoring programmes following the bottom-up approach of seabed classification protocols for an ecosystem-based management to improve existing coastal ecosystem management strategies in Brazil.

► Caraguatatuba Bay was surveyed using acoustic methods and ground-truthing bottom samples. ► Analysis of benthic fauna revealed indicator species and ecologically important areas. ► Acoustic data were classified and a seabed map was produced for the first time. ► This study will improve existing management practices.