. Bulletin - Southern California Academy of Sciences. Science. CETACEAN ECOLOGY 41. Years * No data collection Fig. 3. Cumulative cetacean sighting frequencies (sightings/hour) recorded during 3-month periods in Santa Monica Bay. Risso's dolphins ( of total mixed sightings, « = 8) and bottlenose dolphins and gray whales ( of total mixed sightings, n = 2). Bottlenose dolphins were observed mostly in inshore waters (, n = 180), but offshore schools were also recorded (, « = 41) outside the bay and out to Santa Barbara Island. Short-beaked and long-beaked common dolphins were o
. Bulletin - Southern California Academy of Sciences. Science. CETACEAN ECOLOGY 41. Years * No data collection Fig. 3. Cumulative cetacean sighting frequencies (sightings/hour) recorded during 3-month periods in Santa Monica Bay. Risso's dolphins ( of total mixed sightings, « = 8) and bottlenose dolphins and gray whales ( of total mixed sightings, n = 2). Bottlenose dolphins were observed mostly in inshore waters (, n = 180), but offshore schools were also recorded (, « = 41) outside the bay and out to Santa Barbara Island. Short-beaked and long-beaked common dolphins were observed mostly in offshore waters (), usually above escarpments and submarine canyons (, n = 111). Bottlenose dolphins and the two common dolphin species were often recorded within and outside the boundaries of the four coastal designed MPAs (Point Dume SMR and SMCA, Point Vicente SMCA, and Abalone Cove SMCA); bottlenose dolphins were also found within Bird Rock and Blue Cavern SMCAs near Catahna Island (Fig. la). Gray whales were often recorded in inshore waters ( of gray whale sightings, n = 11), but also near Santa Monica Canyon (, n = 33) and the escarpment near Point Vicente (, n = 33). Gray whales were observed within the boundaries of three designed MPAs: Point Dume SMR, Point Vicente and Abalone Cove SMCAs (n = 5). All other cetaceans were seen exclusively in offshore waters (Fig. la). Risso's dolphin sightings occurred either in the bay, near the escarpment or the Santa Monica Canyon (, n = 19), or at more than 15km from shore. Risso's dolphins were also recorded within the Point Vicente SMCA (n = 1). Dall's porpoises also occurred mostly in the bay (, n = 16) and, with the exclusion of one sighting, always near Santa Monica and Redondo canyons or along the escarpment. They were found inside the Point Dume SMR once. Of a total of nine sightings. Pacific white-sided dolphins were observed exclusively inside the bay with no distinctiv
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