. Cetaceans of the Channel Islands National Marine Sanctuary / prepared for National Oceanic and Atmospheric Administration, Channel Islands National Marine Sanctuary and NOAA, National Marine Fisheries Service by Stephen Leatherwood, Brent S. Stewart, Pieter A. Folkens. Whales California Channel From an extensive review of all data available on the species we concluded that east of longitude 180 W these gregarious dolphins occur from about latitude 20 N (just south of the southern tip of Baja California) to latitude 6i°N (Valdez, Alaska). They are found in pelagic waters, over the c
. Cetaceans of the Channel Islands National Marine Sanctuary / prepared for National Oceanic and Atmospheric Administration, Channel Islands National Marine Sanctuary and NOAA, National Marine Fisheries Service by Stephen Leatherwood, Brent S. Stewart, Pieter A. Folkens. Whales California Channel From an extensive review of all data available on the species we concluded that east of longitude 180 W these gregarious dolphins occur from about latitude 20 N (just south of the southern tip of Baja California) to latitude 6i°N (Valdez, Alaska). They are found in pelagic waters, over the continental slope and shelf, and in some inland marine waters of Washington, British Columbia and Southeast Alaska. They appear to be continuously distributed across the temperate North Pacific. Pacific white-sided dolphins sometimes come very close to shore in Monterey Bay, Vizcaino Bay and along the explosed coasts of Southern California. Less frequently, they enter Magdalena Bay and the en- trances to Puget Sound, Queen Charlotte Sound and Southeast Alaska. These dolphins have been seen and photographed recently on Gorda Banks, in the Cerralvo Channel and around Isla Espiritu Santu, all in the Sea of Cortez, though they are apparently not common in those regions. In the areas of most intensive observations (latitude 20 N to 34 N on the Pacific coast) the species has been observed mainly shoreward of the outer margin of the California Current, suggesting that it is principally an inhabitant of rich upwelling waters, especially near the heads of deep ocean canyons. There have been a few sightings in water as shallow as 10 fms, especially off San Diego, Santa Monica and Santa Barbara in winter, but the species seems to prefer deeper water. White- sided dolphins are encountered widely in continental shelf, continental slope and offshore zones. The species is a common inhabitant of the SCB, where it appears to occur in inshore waters from November through April and farther offsho
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