The Brown Pelican (Pelecanus occidentalis) is the smallest of the eight species of pelican, although it is a large bird in nearly every other regard. It is 106–137 cm (42–54 in) in length, weighs from 2.75 to 5.5 kg (6.1 to 12 lb) and has a wingspan from 1.83 to 2.5 m (6.0 to 8.2 ft).
Range and habits
The Brown Pelican occurs on both coasts in the Americas. On the Atlantic Coast and Gulf Coast they distribute from Nova Scotia to Venezuela, and to the mouth of the Amazon River. On the Pacific Ocean they are found from British Columbia to south central Chile, and including the Galapagos Islands. Some immature birds may stray to inland freshwater lakes. After nesting, North American birds move in flocks further north along the coasts, returning to warmer waters for winter. Their young are hatched in broods of about 3, and eat around 150 lbs. of fish in the 8–10 month period they are cared for.
This bird is distinguished from the American White Pelican by its brown body and its habit of diving for fish from the air, as opposed to co-operative fishing from the surface. It eats mainly fish and amphibians as well as crustaceans. Groups of Brown Pelicans often travel in single file, flying low over the water's surface.
Anchovy relationship to feeding/ nesting
Threats and conservation
Pesticides like DDT and dieldrin threatened the Brown Pelican's future in the southeast United States and California in the early 1970s. Pesticides also threatened the pelican population in Florida in this period. A research group from the University of Tampa headed by Dr. Ralph Schreiber conducted research in the Tampa Bay/St Petersburg area and found that DDT caused the pelican eggshells to be too thin and incapable of supporting the embryo to maturity. As a result of this research, DDT usage was eliminated in Florida, followed by the rest of the US. Along with the American White Pelican, the Brown Pelican is protected by the Migratory Bird Treaty Act of 1918.
The International Union for Conservation of Nature's Red List has listed the Brown Pelican as Least Concern since 1988. The US government imposed a ban on the use of DDT in 1972. Since then, the population of Brown Pelican has increased. Current estimates place the population at 650,000 individuals. Millions of barrels of crude oil from the Deepwater Horizon oil spill caused by the explosion in April 2010 of the Deepwater Horizon oil rig in the Gulf of Mexico may drift ashore and threaten the subspecies of the Brown Pelican that lives in Louisiana.
There are five subspecies:
- P. o. californicus (California Brown Pelican)
- P. o. carolinensis (Eastern Brown Pelican) Gmelin, 1789
- P. o. occidentalis (Caribbean Brown Pelican) Linnaeus, 1766
- P. o. murphy (Pacific Brown Pelican) Wetmore, 1945
- P. o. urinator (Galapagos Brown Pelican) Wetmore, 1945
The Peruvian Pelican, Pelecanus thagus, used to be considered a subspecies of the Brown Pelican (P. o. thagus). Due to its well-defined allopatry and because it is much larger and heavier than its relatives, it has been reclassified as a separate species.
The Brown Pelican is the national bird of Barbados and the Turks and Caicos Islands, and state bird of Louisiana. It is also one of the mascots of Tulane University and is on both Tulane's and Louisiana State University's seal. It is also on the Crest of the University of the West Indies.
- ^ a b BirdLife International (2009). "Pelecanus occidentalis". IUCN Red List of Threatened Species. Version 2009.2. International Union for Conservation of Nature. http://www.iucnredlist.org/apps/redlist/details/150970.
- ^ Brown Pelican - Pelecanus occidentalis (Report). U.S. Fish and Wildlife Service. 2009-11. http://www.fws.gov/contaminants/pdf/brown_pelicanfactsheet09.pdf. Retrieved 2011-09-20.
- ^  ANDERSON ET AL.: BROWN PELICANS AS ANCHOVY STOCK INDICATORS CalCOFI Rep., Vol. XXI, 1980 "BROWN PELICANS AS ANCHOVYSTOCK INDICATORSAND THEIR RELATIONSHIPS TO COMMERCIAL FISHING" — p. 55: "3) Pelican [i.e. the brown pelican]] reproductive rate (fledging success = F‘) depends largely on levels of anchovy abundance and availability. The diet of breeding pelicans from 1972 to 1979 was 92% anchovies (N = 2195; Gress et al. in preparation). At Anacapa Island, breeding pelicans feed mostly in the Santa Barbara Channel later in the breeding season, but their feeding areas are variable due to mobility of their prey, anchovies (Gress et al. in preparation). Less is known of pelicans nesting at Coronado Norte, but a similar situation involving feeding areas is likely."
- ^ Dina Cappiello (November 12, 2009). "Brown pelicans off endangered species list". San Francisco Chronicle. http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2009/11/12/BAP71AIOJD.DTL.
- ^ Tony Allen-Mills (June 6, 2010). "Pelicans herald Obama's Katrina moment". The Times. http://www.timesonline.co.uk/tol/news/world/us_and_americas/article7144834.ece.