Paulo S Polito, Universidade de Sao Paulo, Instituto Oceanografico, Sao Paulo, Brazil, Marina Sousa, USP University of Sao Paulo, Oceanographic Institute, São Paulo, Brazil, Ana Clara Mariani, University of Maine, School of Marine Sciences, Orono, United States and Olga T Sato, Oceanographic Institute of the University of Sao Paulo (IOUSP), Sao Paulo, Brazil