Least tern
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| Least Tern | |
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| On the Atlantic coast, New Jersey, USA | |
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| Species: | S. antillarum
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| Binomial name | |
| Sternula antillarum (Lesson, 1847)
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The Least Tern (Sternula antillarum, formerly Sterna antillarum) is a species of tern that breeds in North America and locally in northern South America. It is closely related to, and was formerly often considered conspecific with, the Little Tern of the Old World. Other close relatives include the Yellow-billed Tern and Peruvian Tern, both from South America.
It is a small tern, 22–24 cm long, with a wingspan of 50 cm, and weighing 39–52 g. The upper parts are a fairly uniform pale gray, and the underparts white. The head is white, with a black cap and line through the eye to the base of the bill, and a small white forehead patch above the bill; in winter, the white forehead is more extensive, with a smaller and less sharply defined black cap. The bill is yellow with a small black tip in summer, all blackish in winter. The legs are yellowish. The wings are mostly pale gray, but with conspicuous black markings on their outermost primaries. In behavior, it flies over water with fast, jerky wingbeats and a distinctive hunchback appearance, with the bill pointing slightly downward.
It is migratory, wintering in Central America, the Caribbean and northern South America. Many spend their whole first year in their wintering area (Thompson et al. 1997). It has occurred as a vagrant to Europe, with one record in Great Britain.
It differs from the Little Tern mainly in that its rump and tail are gray, not white, and it has a different, more squeaking call; from the Yellow-billed Tern in being paler gray above and having a black tip to the bill; and from Peruvian Tern in being paler gray above and white (not pale gray) below and having a shorter black tip to the bill.
Subspecies
- Sternula antillarum antillarum (Lesson, 1847). Breeds on the Atlantic coast of North America, from Maine south along the east and south coasts of the United States, Bermuda, the Caribbean, and Venezuela; winters south to northern Brazil.
- Sternula antillarum athalassos (Burleigh & Lowery, 1942). Breeds on the rivers of the Mississippi River, Brazos River, Trinity River, and Rio Grande basins (Thompson et al. 1997); winters south to northern Brazil.
- Sternula antillarum browni (Mearns, 1916) California Least Tern. Breeds on the Pacific coast of North America, from central California south to western Mexico; winters mainly in Central America.
Conservation and status
S. a. antillarum
The population is about 21,500 pairs; it is not currently considered federally threatened, though it is considered threatened in many of the states in which it breeds. Threats include egg and fledgling predators, high tides and recreational use of nesting beaches.
S. a. athalassos
The interior subspecies, with a current population of about 7,000 pairs, was listed as an endangered subspecies in 1985 (estimated 1,000 breeding pairs), due to loss of habitat caused by dams, reservoirs, channelization, and other changes to river systems.
S. a. brownii
The western population, the California Least Tern, was listed as an endangered species in 1972 with a population of about 600 pairs. With aggressive management, the Californian population has rebounded in recent years to about 4,500 pairs, a marked increase from 582 pairs in 1974 when census work began, though it is still listed as an endangered subspecies. The California subspecies breeds on beaches and bays of the Pacific Ocean within a very limited range of southern California, in San Francisco Bay and in northwestern Mexico. While numbers have gradually increased with its protected status, it is still vulnerable to predators, natural disasters or further disturbance by humans.
Nesting and breeding behavior
The Least Tern arrives at its breeding grounds in late April. The breeding colonies are not dense and may appear along either marine or estuarine shores, or on sandbar islands in large rivers, in areas free from humans or predators. Courtship typically takes place removed from the nesting colony site, usually on an exposed tidal flat or beach. Only after courtship has confirmed mate selection does nesting begin by mid-May and is usually complete by mid-June. Nests are situated on barren to sparsely vegetated places near water, normally on sandy or gravelly substrates. In the southeastern United States, many breeding sites are on white gravel rooftops[1]. In the San Francisco Bay region, breeding typically takes place on abandoned salt flats. Where the surface is hard, this species may use an artificial indentation (such as a deep dried footprint) to form the nest basin.
The nest density may be as low as several per acre, but in San Diego County, densities of 200 nests per acre have been observed. Most commonly the clutch size is two or three, but it is not rare to consist of either one or four eggs. Both female and male incubate the eggs for a period of about three weeks, and both parents tend the semiprecocial young. Young birds can fly at age four weeks. After formation of the new families, groupings of birds may appear at lacustrine settings in proximity to the coast. Late-season nesting may be renests or the result of late arrivals. In any case, the bulk of the population has left the breeding grounds by the end of August.
Feeding and roosting characteristics
The Least Tern hunts primarily in shallow estuaries and lagoons, where smaller fishes are abundant. It hovers until spotting prey, and then plunges into the water without full submersion to extract dinner. In the bays and lagoons of Southern California and northern Mexico, the favored prey include anchovy, smelt, silversides, shiner surfperch and small crustaceans. Sometimes the terns feed near shore in the open ocean, especially in proximity to lagoons or bay mouths.
Adults do not require cover, so that they commonly roost on the open ground. After young chicks are three days old, they are brooded less frequently by parents and require wind blocks and shade. Notable disruption of colonies can occur from predation by Burrowing Owls and American Kestrels (Collins, 1980). Predation by domestic cats has been observed in at least one colony (California Wildlife, 1990). Predation on inland breeding terns by Coyotes, Bobcats, feral dogs and cats, Great Blue Herons, Mississippi Kites, and owls has also been documented (Jones 1997-2006).
Bibliography
- Template:IUCN2008 Database entry includes justification for why this species is of least concern
- National Geographic Society (2002): Field Guide to the Birds of North America. National Geographic, Washington DC. ISBN 0-7922-6877-6
- Audubon Handbook: Western Birds, McGraw Hill Book Company (1988) ISBN 0-07-019977-9
- B. Massey, Breeding Biology of the California least tern, Proceedings Linn. Society, New York 72:1-24 (1974)
- California Wildlife, Volume II, Birds, ed, by David C. Zeiner, William F. Laudenslayer and Kenneth E. Meyer, published by the California Department of Fish and Game,Nov , 1988.
- Gary Deghi, C. Michael Hogan et al., Biological Assessment for the Proposed Tijuana/San Diego Joint Innternational Wastewater Treatment Plant, Publication of the U.S. Environmental Protection Agency Region IX, Earth Metrics Incorporated, Burlingame, CA with Harvey and Stanley, Alviso, CA
- L. Collins and S. Bailey, California least tern nesting season at Alameda Naval Air Station, 1980 Admin. Rep. 25pp.
- Olsen and Larsson, Terns of Europe and North America ISBN 0-7136-4056-1
- Thompson, Bruce C., Jerome A. Jackson, Joannna Burger, Laura A. Hill, Eileen M. Kirsch and Jonathan L. Atwood. 1997. Least Tern (Sterna antillarum), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: doi:10.2173/bna.290
References
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