TY - JOUR T1 - Conservation status and updated census of Patella ferruginea (Gastropoda, Patellidae) in Ceuta: distribution patterns and new evidence of the effects of environmental parameters on population structure AU - Rivera-Ingraham, G. A. AU - Espinosa, F. AU - García-Gómez, J. C. PY - 2011 VL - 34 IS - 1 JF - Animal Biodiversity and Conservation