Red Triangle (Pacific Ocean)

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Approximate boundaries of the Red Triangle

The Red Triangle is the colloquial name of a roughly triangle-shaped region off the coast of northern California, extending from Bodega Bay, north of San Francisco, out slightly beyond the Farallon Islands, and down to the Big Sur region, south of Monterey. The area has a very large population of marine mammals, such as elephant seals, harbor seals, sea otters and sea lions, which are favored prey of great white sharks.[1] Around thirty-eight percent of recorded great white shark attacks on humans in the United States have occurred within the Red Triangle—eleven percent of the worldwide total.[2] The area encompasses the beaches of the heavily populated San Francisco Bay Area, and many people enjoy surfing, windsurfing, swimming and diving in these waters.[3]

Geography[edit]

The Red Triangle is defined by its vertices: the northern vertex is Bodega Bay (Bodega Head), the western vertex is the Farallones, and the southern vertex is Big Sur or Monterey Bay.[4] The movement of sharks and other large marine animals in this region were studied starting in 1999 under the Tagging of Pacific Predators (TOPP) program, an international collaboration.[5] TOPP found that white sharks in the Red Triangle are genetically distinct from others in the Pacific Ocean, such as those found off South Africa and Australia.[5]

Schedule[edit]

The population of northeastern Pacific white sharks tend to congregate along the north/central California coast each fall, then leave the area in December for the deep ocean approximately halfway between California and Hawaii. This region is referred to by TOPP as the White Shark Café.[5] Female whites tend to visit the Gulf of the Farallones every two years, which researchers believe to be based on the shark reproductive cycle.[4] Adult Great White Sharks are no longer present in the Red Triangle during the month of May, and start to return in August.[6]

Year Location
1851 San Francisco Bay (or San Leandro Bay), near cannery, Alameda County
1899 Monterey Bay, Monterey County
1926 San Francisco Bay (or San Leandro Bay), near cannery, Alameda County
1952 Pacific Grove, Monterey Bay, Monterey County
1955 Pacific Grove, Monterey County
1956 Van Ness Municipal Pier, San Francisco
1959 Baker Beach, San Francisco County
1959 Dillon Beach, Marin County
1959 Bodega Rock, Sonoma County
1960 Tomales Point, Marin County
1960 Aptos, Santa Cruz County
1961 Tomales Point, Marin County
1961 Portuguese Beach at mouth of Salmon Creek, Sonoma County
1962 Farallon Islands
1962 12' tank at Steinhart Aquarium, San Francisco
1962 San Francisco Bay
1962 San Francisco Bay
1962 San Francisco Bay
1962 Farallon Islands
1963 San Mateo County
1964 Southeast Farallon Island
1965 Pacifica, San Mateo County
1966 Pebble Beach, Cypress Point, Monterey County
1968 Bodega Rock, Sonoma County
1969 Pigeon Point, San Mateo County
1969 Bird Rock, Tomales Point, near Marin County / Sonoma County border
1971 Sea Ranch, Sonoma County
1972 Bird Rock, near Tomales Point, Marin County
1972 Point Sur, Monterey County
1974 Tomales Point, Marin County
1974 San Gregorio Beach, San Mateo County
1974 Franklin Point, San Mateo County
1974 Franklin Point, San Mateo County
1974 North Farallon Island, Farallon Islands
1974 North of Point Sur, Monterey County
1975 Farallon Islands
1977 McClure Beach, near Tomales Point, Marin County
1978 Pajaro Dunes, Santa Cruz County
1979 Ano Nuevo Island, San Mateo, County
1981 South Moss Beach, Spanish Bay, Monterey Peninsula
1982 Stillwater Cove, Sonoma County
1982 Monastery Beach, Carmel Bay, Monterey County
1984 San Francisco
1984 Pigeon Point, San Mateo County
1984 Tomales Point, Marin County
1985 Elephant Rock near Tomales Point, Marin County
1985 Southeast Farallon Island, Farallon Islands
1986 Linda Mar Beach, Pedro Point, San Mateo County
1986 Monastery Beach, Carmel River State Park, Monterey Peninsula, Monterey California
1987 Tunitas Beach, San Mateo County
1987 Davenport Light, San Mateo County
1989 Monterey Bay, Monterey County
1989 Southeast Farallon Island, Farallon Islands
1990 Montera Beach, San Mateo County
1990 Russian Gulch, Jenner, Sonoma County
1990 Monastery Beach, Carmel Bay, Monterey County
1991 8.5 miles south of Ano Nuevo State Reserve, Davenport County
1991 Horseshoe Reef, Scott Creek, Davenport, Santa Cruz County
1992 Ano Nuevo, San Mateo County
1993 Linda Mar Beach, Pedro Point, San Mateo County
1993 Goat Rock, Bodega Bay, Sonoma County?
1995 Bluefish Cove, Pt. Lobos State Park, Monterey County
1995 Carmel, Monterey County
1995 Davenport Landing, Santa Cruz County
1996 Bird Rock, Tomales Point
1996 North Salmon Creek Beach, Sonoma County
1996 Dillon Beach, Marin County
1996 Salmon Creek Beach, Sonoma County
1998 Stinson Beach, Marin County
1999 North of Pidgeon Point, San Mateo County
1999 Waddell Reef, Santa Cruz County
2000 Mavericks, Half Moon Bay, San Mateo County
2002 Stinson Beach, Marin County
2002 Salmon Creek, Sonoma County
2004 Salmon Creek, Sonoma County
2004 Limantour Beach, Point Reyes National Seashore
2005 Salmon Beach, Sonoma County
2005 Mavericks, Half Moon Bay, San Mateo County
2005 Ocean Beach, San Francisco, San Francisco County
2006 Santa Cruz, Santa Cruz County
2006 Monterey, Monterey County
2006 Dillon Beach, Marin County
2007 Bean Hollow State Beach, San Mateo County
2007 Marina State Beach, Monterey County
2008 Dillon Beach, Marin County
2009 Davenport, Santa Cruz County
2009 Loch Lomond, Marin County
2010 Pigeon Point, San Mateo County
2011 Marina State Beach, Monterey County
2011 Pigeon Point
2012 Pleasure Point, Santa Cruz County
2012 Davenport Landing, Santa Cruz County
2013 Pacific State , San Mateo County
2013 Pillar Point, Half-Moon Bay, San Mateo County
2014 Manresa State Beach, Santa Cruz County
2014 Franklin Point, San Mateo County
2016 Capitola, Santa Cruz County
2017 Monterey Bay
2017 Santa Cruz, Santa Cruz County
2017 Stillwater Cove, Monterey County
2017 Drakes Estero, Point Reyes, Marin County

Figure One: Shark Attack History in the Red Triangle ([7])

References[edit]

  1. ^ www.pbs.org
  2. ^ "FLMNH Ichthyology Department: 1876-2010 World's Confirmed Unprovoked Attacks by White Sharks". ufl.edu. 24 January 2018.
  3. ^ "Tracking Great Whites in The Red Triangle". pelagic.org.
  4. ^ a b Fimrite, Peter (22 September 2012). "Great white sharks back in Red Triangle". San Francisco Chronicle. Retrieved 4 July 2018.
  5. ^ a b c "Unveiling the underwater ways of the white shark" (Press release). Stanford University. 15 February 2008. Retrieved 4 July 2018.
  6. ^ "We Curated All of the Best Information About Great White Sharks Swimming in the San Francisco Bay". 28 March 2021.
  7. ^ "How to search GSAF data". sharkattackfile.net. Retrieved 2021-11-02.

External links[edit]