TY - JOUR T1 - Present status of the endangered limpet Cymbula nigra (Gastropoda, Patellidae) in Ceuta: how do substrate heterogeneity and area accessibility affect population structure? AU - Rivera-Ingraham, G. A. AU - Espinosa, F. AU - García-Gómez, J. C. PY - 2011 VL - 34 IS - 2 JF - Animal Biodiversity and Conservation