Their white forehead contrasting with a black cap is easily seen in flight. The Least Tern is a priority species for ABC. Sources and Additional Information. allowed San Diego County’s Least Tern population to increase from about 500 pairs in the late 1970s to about 2100–2800 pairs 1997–2002 and nearly 4000 pairs in 2003. Human encroachment is largely responsible for the least tern's historic decline. Taxonomic status of this form uncertain. The current population of the Eastern Statistical Region is 181,858 citizens or 9.0% of the total population of the Republic of North Macedonia, according to the last population census in 2002. The most common ones are the method of maximum likelihood, the method of moment and the method of Ordinary Least Squares (OLS). Unlock thousands of full-length species accounts and hundreds of bird family overviews when you subscribe to Birds of the World. Little Tern Sterna albifrons occuring in Europe, Asia, Africa and Australia and Least Tern Sterna antillarum from the Americas. Least terns get small fishes and crustaceans by skimming the surface of the water or by hovering, then diving into the water. Least Tern populations in coastal New Jersey: monitoring and management of a regionally-endangered species. The Largest Population: California 39,937,489. They have a yellow bill tipped in black. The most important application is in data fitting. least terns at many nesting beaches particularly in southern California, but efforts to mitigate these threats have not resulted in comparable population growth for plovers (Eberhart-Phillips and Colwell 2014). In 1984, a state survey estimated the breeding population at 931 to 1,001 pairs. They do form a superspecies (including Saunder's Tern, Yellow-billed Tern and Peruvian Tern). Eastern Asia Population History / Eastern Asia Population Projections. In the early 1980s, the population of the subspecies S. a. antillarum was estimated at 21,300 pairs along the east coast of the U.S., but survey methods were not comprehensive and did not include a significant rooftop-nesting Least terns (Sternula antillarum) are colonial, fish-eating birds that nest on barren sandy substrates in open habitats on rivers and coasts (Thompson et al. Introduction. (Fig.1). Least Tern – The Cornell Lab of Ornithology; Least Tern – The New York Department of Environmental Conservation; Least Tern – The New Jersey Division of Fish and Wildlife ; Quick Facts. A state management plan was written for least terns in Maine in 1993 and revised in 2007. The California least tern breeding population averaged about 600 pairs between 1973 and 1975. The western population, the California least tern, was listed as an endangered species in 1972 with a population of about 600 pairs. 1988), In recent years, both species have nested on fly ash deposited by power plants near the river. Least terns are listed as a Species of Management Concern on the East Coast by the U.S. Usually hovers before plunging into water for tiny prey; does more hovering than most terns. At many nesting areas, signs warn people against entering colonies, many of which are roped off during breeding season. The method of least squares is a standard approach in regression analysis to approximate the solution of overdetermined systems (sets of equations in which there are more equations than unknowns) by minimizing the sum of the squares of the residuals made in the results of every single equation. As recently as 1985, the breeding population for all Least Tern nesting sites in the entire United States had dropped as low as 3,000 pairs. Native. 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