. Bulletin. Science. 14 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 34°0' 33°55' 33°45'. 118°45' 118°30' Fig. 1. The study area and the distribution of bottlenose dolphins (X), short-beaked common dolphins (•), and long-beaked common dolphins (?) in the bay. Each symbol represents initial GPS coordinates of sightings. Sightings outside the bay and sightings of Delphinus spp. not recognized at the species level were excluded from this map. Submarine canyons (Dume, Santa Monica, Redondo) and escarpments/slopes (Palos Verdes continental slope, west of Los Angeles slope, south of Malibu montain slope)
. Bulletin. Science. 14 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 34°0' 33°55' 33°45'. 118°45' 118°30' Fig. 1. The study area and the distribution of bottlenose dolphins (X), short-beaked common dolphins (•), and long-beaked common dolphins (?) in the bay. Each symbol represents initial GPS coordinates of sightings. Sightings outside the bay and sightings of Delphinus spp. not recognized at the species level were excluded from this map. Submarine canyons (Dume, Santa Monica, Redondo) and escarpments/slopes (Palos Verdes continental slope, west of Los Angeles slope, south of Malibu montain slope) include respectively sightings located no farther than km from each side of the canyons and the isobaths, and km from the centers of the slopes. Flat areas and plateaus include all the sightings observed in these locations. Submarine canyons are indicated by the three lines. areas, including bays and tidal creeks (Leatherwood et al. 1983). These popula- tions also show morphological, osteological and molecular differentiations (LeDuc and Curry 1998; Rossbach and Herzing 1999). Coastal forms of bottlenose dol- phins exist in many areas of the world (, Shark Bay, Western Australia: Connor and Smolker 1985; the Firth of Tay, Scotland: Wilson 1995; Sarasota Bay, Florida: Scott et al. 1990; Wells 1991; Argentine Bay, Argentina: Wiirsig 1978; Croatia, Mediterranean Sea: Bearzi et al. 1999). Coastal populations usually live within km of shore in schools of 1-25 individuals, sometimes residing in a specific area, while pelagic populations are found in larger groups of 25 to several thou- sand individuals ranging widely in the open ocean (Scott and Chivers 1990; Bearzi et al. 1999; Defran and Weller 1999; Bearzi 2005). Long-term studies on free-ranging bottlenose dolphins in the Southern Califor- nia Bight have been focused mostly along the San Diego coastline (less than 1 km from shore; Defran and Weller 1999). In 1996, a preliminary series of cetacean surveys i
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