Emma Bruder, Mediterranean Institute of Oceanography, CNRS, Marseille Cedex 09, France, Isaac Brito-Morales, University of California Santa Barbara, Marine Science Institute, Santa Barbara, United States, Sophie Laran, Observatoire Pelagis, UAR 3462, CNRS - La Rochelle Université, La Rochelle, France and Vincent Rossi, CNRS-MIO, Mediterranean Institute of Oceanography, Marseille, France