Left panel: Map of the Gulf of California and surrounding areas. The Midriff Islands region (MIR, dotted line) includes the a Bahía de los Ángeles, Canales de Ballenas y Salsipuedes Biosphere Reserve; b Archipiélago de San Lorenzo National Park; and c island San Pedro Mártir Biosphere Reserve (ISPMBR), whereas d Bahía de Loreto National Park is located to the south of the MIR. Right panel: The limits of the ISPMBR, including Island San Pedro Mártir (shaded region) and the monitoring sites (1–6) of this study. 1 Punta Rabijunco 2 Cueva de la Reserva and 3 Los Morritos are located within the core, no-take zone (dashed region) of the ISPMBR, whereas 4 Cueva del Biólogo 5 Barra Baya 6 La Ventana and 7 Arroyo del Cartelón are located within the buffer zone.