When listed in 1970, just tern 225 pairs remained. California Least Tern Conservation. The population in California in 1973 was thought to be as low Q: Has the California least tern population grown since it was added to the endangered species list in the early 1970s? The California least tern declined dramatically in the late 19th century under intense pressure from the millinery trade. The U.S. FWS's Threatened & Endangered Species System track information about listed species in the United States. A: The number of breeding pairs has increased, but the number of least terns that fledge each year varies a lot.Some factors are predation and the availability of food. The California Least Tern is an endangered migratory bird. Inland, we worked with diverse government partners to improve Interior Least Tern habitat and monitoring. Our staff organized the first range-wide population survey of the Interior Least Tern; in the near future, the species may be removed from the endangered species list. Substantial resources have been used to monitor the California least tern (Sternula antillarum browni; LETE) since it was listed as endangered in 1970. U.S.FWS Species profile about species listing status, federal register publications, recovery, critical habitat, conservation planning, petitions, and life history. Good Turns for Least Tern. After wintering in Central and South America, the terns arrive in the summer to breed beginning in early April each year. Each spring, the birds migrate from South America to California… When the California least tern, an endangered subspecies of the more ubiquitous least tern, was listed by the federal government back in 1970, the population was down to 600 pairs as a result of habitat loss, non-native predators, and disturbance. There are three recognized […] Twentieth-century declines were driven by development, recreational crowding at beaches, and human-induced predator expansion. The California least tern measures about 9 inches long and has gray and white feathers and a black cap. When placed on the endangered species list in 1970, just 225 nesting tern pairs were recorded in California [2]. The Least Tern is a priority species for ABC. The California least tern, an endangered bird species, is nesting at the Malibu Lagoon for the first time in more than 70 years. This report contains a suite of analyses designed to address two tasks: (1) identify population trends and drivers of those trends and (2) evaluate current monitoring and management practices. The bird has only two other nesting locations in Southern California. Protection of nest beaches from development, degradation and disturbance, and active predator control programs caused the species to steadily increase to 6,561 pairs in California in 2004 [2]. such as landfills and airports (California Least Tern Recovery Team 1977). The Least Tern is endangered in California by George Seymore California Department of Fish and Game As their name would suggest, Least Terns are among the smallest of the 19 species of terns in the world. Sterna antillarum browni Endangered – Endangered Species Act (1970) Endangered – California Endangered Species Act (1984) The California least tern is a seasonal resident of California from April to September. The subspecies has been listed as endangered since 1972 (California Department of Fish and Game 1972, US Bureau of Sport Fisheries and Wildlife 1973). The California Least Tern is one of the twelve recognized subspecies of the Least (or “little”) Tern. 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