1. Stazione Zoologica Anton Dohrn, Department of Integrative Marine Ecology, Villa Comunale, 80121 Naples, Italy
2. Department of Oceanography, COPAS Sur-Austral & Centro Fondap-Ideal, University of Concepción, Barrio Universitario, Concepcion, Chile
3. Institute of Biomembranes and Bioenergetics, National Research Council, Bari, Italy
4. Current address: CIIMAR — Interdisciplinary Center of Marine and Environmental Research, University of Porto, Portugal