Brown Pelican
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The brown pelican (''Pelecanus occidentalis'') is a
bird Birds are a group of warm-blooded vertebrates constituting the class (biology), class Aves (), characterised by feathers, toothless beaked jaws, the Oviparity, laying of Eggshell, hard-shelled eggs, a high Metabolism, metabolic rate, a fou ...
of the
pelican Pelicans (genus ''Pelecanus'') are a genus of large water birds that make up the family Pelecanidae. They are characterized by a long beak and a large throat pouch used for catching prey and draining water from the scooped-up contents before ...
family,
Pelecanidae The Pelecanidae is a family of Pelecaniformes, pelecaniform birds within the Pelecani that contains three genera: the extinct ''Eopelecanus'' and ''Miopelecanus'' and the extant ''Pelecanus''. Pelecanids have existed since the late Eocene (Pria ...
, one of three
species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...
found in the Americas and one of two that feed by diving into water. It is found on the Atlantic Coast from
New Jersey New Jersey is a U.S. state, state located in both the Mid-Atlantic States, Mid-Atlantic and Northeastern United States, Northeastern regions of the United States. Located at the geographic hub of the urban area, heavily urbanized Northeas ...
to the mouth of the Amazon River, and along the
Pacific Coast Pacific coast may be used to reference any coastline that borders the Pacific Ocean. Geography Americas North America Countries on the western side of North America have a Pacific coast as their western or south-western border. One of th ...
from
British Columbia British Columbia is the westernmost Provinces and territories of Canada, province of Canada. Situated in the Pacific Northwest between the Pacific Ocean and the Rocky Mountains, the province has a diverse geography, with rugged landscapes that ...
to Peru, including the Galapagos Islands. The
nominate subspecies In biological classification, subspecies (: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics ( morphology), but that can successfully interbreed. ...
in its
breeding plumage Plumage () is a layer of feathers that covers a bird and the pattern, colour, and arrangement of those feathers. The pattern and colours of plumage differ between species and subspecies and may vary with age classes. Within species, there can b ...
has a white head with a yellowish wash on the crown. The
nape The nape is the back of the neck. In technical anatomical/medical terminology, the nape is also called the nucha (from the Medieval Latin rendering of the Arabic , ). The corresponding adjective is ''nuchal'', as in the term ''nuchal rigidity'' ...
and neck are dark maroon–brown. The upper sides of the neck have white lines along the base of the gular pouch, and the lower fore neck has a pale yellowish patch. The male and female are similar, but the female is slightly smaller. The nonbreeding adult has a white head and neck. The pink skin around the eyes becomes dull and gray in the nonbreeding season. It lacks any red hue, and the pouch is strongly olivaceous ochre-tinged and the legs are olivaceous gray to blackish-gray. The brown pelican mainly feeds on fish, but occasionally eats
amphibian Amphibians are ectothermic, anamniote, anamniotic, tetrapod, four-limbed vertebrate animals that constitute the class (biology), class Amphibia. In its broadest sense, it is a paraphyletic group encompassing all Tetrapod, tetrapods, but excl ...
s,
crustacean Crustaceans (from Latin meaning: "those with shells" or "crusted ones") are invertebrate animals that constitute one group of arthropods that are traditionally a part of the subphylum Crustacea (), a large, diverse group of mainly aquatic arthrop ...
s, and the eggs and nestlings of birds. It nests in
colonies A colony is a territory subject to a form of foreign rule, which rules the territory and its indigenous peoples separated from the foreign rulers, the colonizer, and their '' metropole'' (or "mother country"). This separated rule was often or ...
in secluded areas, often on islands, vegetated land among sand dunes, thickets of shrubs and trees, and
mangroves A mangrove is a shrub or tree that grows mainly in coastal saline or brackish water. Mangroves grow in an equatorial climate, typically along coastlines and tidal rivers. They have particular adaptations to take in extra oxygen and remove sal ...
. Females lay two or three oval, chalky white eggs. Incubation takes 28 to 30 days with both sexes sharing duties. The newly hatched chicks are pink, turning gray or black within 4 to 14 days. About 63 days are needed for chicks to
fledge Fledging is the stage in a flying animal's life between egg, hatching or birth and becoming capable of flight. This term is most frequently applied to birds, but is also used for bats. For altricial birds, those that spend more time in vulnera ...
. Six to 9 weeks after hatching, the juveniles leave the nest, and gather into small groups known as pods. The brown pelican is the
national bird This is a list of national birds, including official birds of overseas territories and other states described as nations. Most species in the list are officially designated. Some species hold only an "unofficial" status. The column is marked a ...
of Saint Martin,
Barbados Barbados, officially the Republic of Barbados, is an island country in the Atlantic Ocean. It is part of the Lesser Antilles of the West Indies and the easternmost island of the Caribbean region. It lies on the boundary of the South American ...
,
Saint Kitts and Nevis Saint Kitts and Nevis, officially the Federation of Saint Christopher (St Kitts) and Nevis, is an island country consisting of the two islands of Saint Kitts and Nevis, both located in the West Indies, in the Leeward Islands chain of the Less ...
, and the
Turks and Caicos Islands The Turks and Caicos Islands (abbreviated TCI; and ) are a British Overseas Territory consisting of the larger Caicos Islands and smaller Turks Islands, two groups of tropical islands in the Lucayan Archipelago of the Atlantic Ocean and no ...
, and the official state bird of
Louisiana Louisiana ( ; ; ) is a state in the Deep South and South Central regions of the United States. It borders Texas to the west, Arkansas to the north, and Mississippi to the east. Of the 50 U.S. states, it ranks 31st in area and 25 ...
, appearing on the flag, seal, or coat of arms of each. It has been rated as a species of least concern by the
International Union for Conservation of Nature The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the stat ...
. It was listed under the United States Endangered Species Act from 1970 to 2009, as pesticides such as
dieldrin Dieldrin is an organochlorine compound originally produced in 1948 by J. Hyman & Co, Denver, as an insecticide. Dieldrin is closely related to aldrin, which reacts further to form dieldrin. Aldrin is not toxic to insects; it is oxidized in the i ...
and DDT threatened its future in the
Southeastern United States The Southeastern United States, also known as the American Southeast or simply the Southeast, is a geographical List of regions in the United States, region of the United States located in the eastern portion of the Southern United States and t ...
and
California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
. In 1972, the use of DDT was banned in
Florida Florida ( ; ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders the Gulf of Mexico to the west, Alabama to the northwest, Georgia (U.S. state), Georgia to the north, the Atlantic ...
, followed by the rest of the United States. Since then, the brown pelican's population has increased. In 1903,
Theodore Roosevelt Theodore Roosevelt Jr. (October 27, 1858 – January 6, 1919), also known as Teddy or T.R., was the 26th president of the United States, serving from 1901 to 1909. Roosevelt previously was involved in New York (state), New York politics, incl ...
set aside the first
National Wildlife Refuge The National Wildlife Refuge System (NWRS) is a system of protected areas of the United States managed by the United States Fish and Wildlife Service (FWS), an agency within the United States Department of the Interior, Department of the Interi ...
, Florida's Pelican Island, to protect the species from hunters.


Taxonomy

The brown pelican was described by Swedish zoologist
Carl Linnaeus Carl Linnaeus (23 May 1707 – 10 January 1778), also known after ennoblement in 1761 as Carl von Linné,#Blunt, Blunt (2004), p. 171. was a Swedish biologist and physician who formalised binomial nomenclature, the modern system of naming o ...
in the 1766 12th edition of his ''
Systema Naturae ' (originally in Latin written ' with the Orthographic ligature, ligature æ) is one of the major works of the Sweden, Swedish botanist, zoologist and physician Carl Linnaeus (1707–1778) and introduced the Linnaean taxonomy. Although the syste ...
'', where it was given the binomial name of ''Pelecanus occidentalis.'' It belongs to the
New World The term "New World" is used to describe the majority of lands of Earth's Western Hemisphere, particularly the Americas, and sometimes Oceania."America." ''The Oxford Companion to the English Language'' (). McArthur, Tom, ed., 1992. New York: ...
clade of the genus '' Pelecanus''. Five
subspecies In Taxonomy (biology), biological classification, subspecies (: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (Morphology (biology), morpholog ...
of the brown pelican are recognized. At least some of these subspecies are genetically distinct despite similar
phenotype In genetics, the phenotype () is the set of observable characteristics or traits of an organism. The term covers the organism's morphology (physical form and structure), its developmental processes, its biochemical and physiological propert ...
s. The subspecies differ from one another in size, coloration of the throat pouch (among other bare parts) in breeding condition, and/or certain breeding plumage details, as well as geographic range. The brown pelican is part of a clade that includes the Peruvian pelican (''P. thagus'') and
American white pelican The American white pelican (''Pelecanus erythrorhynchos'') is a large aquatic soaring bird from the order Pelecaniformes. It breeds in interior North America, moving south and to the coasts, as far as Costa Rica, in winter. Taxonomy The Americ ...
(''P. erythrorhynchos''); brown and Peruvian pelicans are sister taxa, with American white pelican a more distant relative. The Peruvian pelican was previously considered a subspecies of the brown pelican, but is now considered a separate species on the basis of its much greater size (around double the weight of the brown pelican), differences in bill color and plumage, and a lack of evidence of hybridization between the forms where their ranges approach and overlap. (In captivity, the brown pelican is known to have hybridized with both the American white pelican and the more distantly related
great white pelican The great white pelican (''Pelecanus onocrotalus'') also known as the eastern white pelican, rosy pelican or simply white pelican is a bird in the pelican family. It breeds from southeastern Europe through Asia and Africa, in swamps and shallow ...
.) In 1932, James L. Peters divided ''Pelecanus'' into three subgenera, placing brown pelican (including Peruvian pelican) in a monospecific ''Leptopelicanus'', American white pelican in a monospecific ''Cyrtopelicanus'', and all the rest in the subgenus ''Pelecanus'', a treatment which was also followed by Jean Dorst and Raoul J. Mougin in 1979. Andrew Elliott in 1992, and Joseph B. Nelson in 2005, considered the deepest division among pelicans to lie between brown (plus Peruvian) pelican on the one hand, and the white-plumaged pelicans on the other (among which the large ground-nesting American white,
Australian Australian(s) may refer to: Australia * Australia, a country * Australians, citizens of the Commonwealth of Australia ** European Australians ** Anglo-Celtic Australians, Australians descended principally from British colonists ** Aboriginal Aus ...
, great white, and Dalmatian pelicans were thought to form a clade, and the smaller tree-nesting pink-backed and spot-billed pelicans were likewise considered sister taxa). In 1993,
Paul Johnsgard Paul Austin Johnsgard (28 June 1931 – 28 May 2021) was an ornithologist, artist and emeritus professor at the University of Nebraska. His works include nearly fifty books including several monographs, principally about the waterfowl and cranes. ...
hypothesized that the Americas were colonized relatively late in pelican evolution, with the family originating in Africa or South Asia; however, he later supported the prevailing view that brown (with Peruvian) was the most divergent pelican (and considered American white and great white pelicans to be close relatives, implying two independent dispersals of pelicans into the Americas, with that of the ancestor of brown and Peruvian pelicans occurring early on). Sibley and Ahlquist's DNA-DNA hybridization studies and
UPGMA UPGMA (unweighted pair group method with arithmetic mean) is a simple agglomerative (bottom-up) hierarchical clustering method. It also has a weighted variant, WPGMA, and they are generally attributed to Sokal and Michener. Note that the unwei ...
tree published in 1990 supported brown pelican as sister to a clade comprising all the white-plumaged pelicans analyzed, including American white pelican (although the relationships among the latter group differed). With better genetic data and more modern methods, a new phylogenetic hypothesis of pelican relationships has arisen, which contrasts with the traditional view of brown and Peruvian being the most divergent pelicans based on their distinctive plumage and behavior (and early molecular data). Rather than the brown-plumaged pelicans and white-plumaged pelicans forming two reciprocally monophyletic groups, the American white pelican is sister to brown and Peruvian pelicans, the three together forming an exclusively New World pelican clade. (Among the other pelicans, pink-backed, Dalmatian, and spot-billed pelicans are close relatives, together sister to Australian pelican. Great white pelican has no particularly close relatives; while it may be sister to the previous four, this relationship had low statistical support.)


Description

The brown pelican is the smallest of the eight extant pelican species, but is often one of the larger seabirds in their range nonetheless. It measures in length and has a
wingspan The wingspan (or just span) of a bird or an airplane is the distance from one wingtip to the opposite wingtip. For example, the Boeing 777–200 has a wingspan of , and a wandering albatross (''Diomedea exulans'') caught in 1965 had a wingsp ...
of . The weight of adults can range from , about half the weight of the other pelicans found in the Americas, the Peruvian and American white pelicans. The average weight in Florida of 47 females was , while that of 56 males was . Like all pelicans, it has a very long bill, measuring in length. The
nominate subspecies In biological classification, subspecies (: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics ( morphology), but that can successfully interbreed. ...
in its
breeding plumage Plumage () is a layer of feathers that covers a bird and the pattern, colour, and arrangement of those feathers. The pattern and colours of plumage differ between species and subspecies and may vary with age classes. Within species, there can b ...
has a white head with a yellowish wash on the crown. The
nape The nape is the back of the neck. In technical anatomical/medical terminology, the nape is also called the nucha (from the Medieval Latin rendering of the Arabic , ). The corresponding adjective is ''nuchal'', as in the term ''nuchal rigidity'' ...
and neck are dark maroon–brown. The upper sides of the neck have white lines along the base of the gular pouch, and the lower foreneck has a pale yellowish patch. The feathers at the center of the nape are elongated, forming short, deep chestnut crest feathers. It has a silvery gray mantle,  scapulars, and upperwing coverts (feathers on the upper side of the wings), with a brownish tinge. The lesser
coverts A covert feather or tectrix on a bird is one of a set of feathers, called coverts (or ''tectrices''), which cover other feathers. The coverts help to smooth airflow over the wings and tail. Ear coverts The ear coverts are small feathers behind t ...
have dark bases, which gives the leading edge of the wing a streaky appearance. The uppertail coverts (feathers above the tail) are silvery white at the center, forming pale streaks. The median (between the greater and the lesser coverts),
primary Primary or primaries may refer to: Arts, entertainment, and media Music Groups and labels * Primary (band), from Australia * Primary (musician), hip hop musician and record producer from South Korea * Primary Music, Israeli record label Work ...
(connected to the distal forelimb), secondary (connected to the
ulna The ulna or ulnar bone (: ulnae or ulnas) is a long bone in the forearm stretching from the elbow to the wrist. It is on the same side of the forearm as the little finger, running parallel to the Radius (bone), radius, the forearm's other long ...
), and greater coverts (feathers of the outermost, largest, row of upperwing coverts) are blackish, with the primaries having white shafts and the secondaries having variable silver-gray fringes. The tertials (feathers arising in the brachial region) are silver-gray with a brownish tinge. The underwing has grayish-brown
remiges Flight feathers (''Pennae volatus'') are the long, stiff, asymmetrically shaped, but symmetrically paired pennaceous feathers on the wings or tail of a bird; those on the wings are called remiges (), singular remex (), while those on the ta ...
with white shafts to the outer primary feathers. The axillaries and covert feathers are dark, with a broad, silver–gray central area. The tail is dark gray with a variable silvery cast. The lower mandible is blackish, with a greenish-black gular pouch at the bottom for draining water when it scoops out prey. The breast and belly are dark, and the legs and feet black. It has a grayish white bill tinged with brown and intermixed with pale carmine spots. The crest is short and pale reddish-brown in color. The back, rump, and tail are streaked with gray and dark brown, sometimes with a rusty hue. The male and female are similar, but the female is slightly smaller. It is exceptionally buoyant due to the internal air sacks beneath its skin and in its bones. It is as graceful in the air as it is clumsy on land. The nonbreeding adult has a white head and neck, and the pre-breeding adult has a creamy yellow head. The pink skin around the eyes becomes dull and gray in the non-breeding season. It lacks any red hue, and the pouch is strongly olivaceous ochre tinged and the legs are olivaceous gray to blackish-gray. It has pale blue to yellowish white irides which become brown during the breeding season. During courtship, the bill becomes pinkish red to pale orange, redder at the tip, and the pouch is blackish. Later in the breeding season the bill becomes pale ash-gray over most of the upper jaw and the basal third of the mandible. The juvenile is similar, but is grayish-brown overall and has paler underparts. The head, neck, and thighs are dusky-brown, and the abdomen is dull white. The plumage of the male is similar to a fully adult female, although the male's head feathers are rather rigid. The tail and
flight feather Flight feathers (''Pennae volatus'') are the long, stiff, asymmetrically shaped, but symmetrically paired pennaceous feathers on the wings or tail of a bird; those on the wings are called remiges (), singular remex (), while those on the tai ...
s are browner than those of the adult. It has short, brown upperwing coverts, which are often darker on greater coverts, and dull brownish-gray underwing coverts with a whitish band at the center. The irides are dark brown and the facial skin is bluish. It has a gray bill which is horn-yellow to orange near the tip, with a dark gray to pinkish-gray pouch. It acquires adult plumage at over 3 years of age, when the feathers on the neck become paler, the upperparts become striped, the greater upperwing and median coverts become grayer, and the belly acquires dark spots. The brown pelican is readily distinguished from the American white pelican by its nonwhite plumage, smaller size, and habit of diving for fish from the air, as opposed to co-operative fishing from the surface. It and the Peruvian pelican are the only true marine pelican species. The brown pelican produces a wide variety of harsh, grunting sounds, such as a low-pitched ''hrrraa-hrra'', during displays. The adult also rarely emits a low croak, while young frequently squeal.


Distribution and habitat

The brown pelican lives on the Atlantic, Gulf, and Pacific Coasts in the Americas. On the Atlantic Coast, it is found from the
New Jersey New Jersey is a U.S. state, state located in both the Mid-Atlantic States, Mid-Atlantic and Northeastern United States, Northeastern regions of the United States. Located at the geographic hub of the urban area, heavily urbanized Northeas ...
coast to the mouth of the Amazon River. Along the
Pacific Coast Pacific coast may be used to reference any coastline that borders the Pacific Ocean. Geography Americas North America Countries on the western side of North America have a Pacific coast as their western or south-western border. One of th ...
, it is found from
British Columbia British Columbia is the westernmost Provinces and territories of Canada, province of Canada. Situated in the Pacific Northwest between the Pacific Ocean and the Rocky Mountains, the province has a diverse geography, with rugged landscapes that ...
to northern Peru, including the Galapagos Islands. After nesting, North American birds
move Move or The Move may refer to: Brands and enterprises * Move (company), an American online real estate company * Move (electronics store), a defunct Australian electronics retailer * Daihatsu Move, a Japanese car * PlayStation Move, a motion ...
in flocks further north along the coasts, returning to warmer waters for winter. In the non-breeding season, it is found as far north as Canada. It is a rare and irregular visitor south of
Piura Piura is a city in northwestern Peru, located north of the Sechura Desert along the Piura River. It is the capital of the Piura Region and the Piura Province. Its population was 484,475 as of 2017 and it is the 7th most populous city in Peru. ...
in Peru, where generally it is replaced by the Peruvian pelican, and can occur as a non-breeding visitor south at least to Ica during
El Niño EL, El or el may refer to: Arts and entertainment Fictional entities * El, a character from the manga series ''Shugo Chara!'' by Peach-Pit * Eleven (''Stranger Things'') (El), a fictional character in the TV series ''Stranger Things'' * El, fami ...
years. Small numbers of brown pelicans have been recorded from
Arica Arica ( ; ) is a commune and a port city with a population of 222,619 in the Arica Province of northern Chile's Arica y Parinacota Region. It is Chile's northernmost city, being located only south of the border with Peru. The city is the ca ...
in far northern
Chile Chile, officially the Republic of Chile, is a country in western South America. It is the southernmost country in the world and the closest to Antarctica, stretching along a narrow strip of land between the Andes, Andes Mountains and the Paci ...
. It is fairly common along the coast of California,
South Carolina South Carolina ( ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders North Carolina to the north and northeast, the Atlantic Ocean to the southeast, and Georgia (U.S. state), Georg ...
,
North Carolina North Carolina ( ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It is bordered by Virginia to the north, the Atlantic Ocean to the east, South Carolina to the south, Georgia (U.S. stat ...
,
Georgia Georgia most commonly refers to: * Georgia (country), a country in the South Caucasus * Georgia (U.S. state), a state in the southeastern United States Georgia may also refer to: People and fictional characters * Georgia (name), a list of pe ...
, the West Indies, and many Caribbean islands as far south as
Guyana Guyana, officially the Co-operative Republic of Guyana, is a country on the northern coast of South America, part of the historic British West Indies. entry "Guyana" Georgetown, Guyana, Georgetown is the capital of Guyana and is also the co ...
. Along the
Gulf Coast The Gulf Coast of the United States, also known as the Gulf South or the South Coast, is the coastline along the Southern United States where they meet the Gulf of Mexico. The coastal states that have a shoreline on the Gulf of Mexico are Tex ...
, it inhabits
Alabama Alabama ( ) is a U.S. state, state in the Southeastern United States, Southeastern and Deep South, Deep Southern regions of the United States. It borders Tennessee to the north, Georgia (U.S. state), Georgia to the east, Florida and the Gu ...
,
Texas Texas ( , ; or ) is the most populous U.S. state, state in the South Central United States, South Central region of the United States. It borders Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the we ...
,
Florida Florida ( ; ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders the Gulf of Mexico to the west, Alabama to the northwest, Georgia (U.S. state), Georgia to the north, the Atlantic ...
,
Mississippi Mississippi ( ) is a U.S. state, state in the Southeastern United States, Southeastern and Deep South regions of the United States. It borders Tennessee to the north, Alabama to the east, the Gulf of Mexico to the south, Louisiana to the s ...
,
Louisiana Louisiana ( ; ; ) is a state in the Deep South and South Central regions of the United States. It borders Texas to the west, Arkansas to the north, and Mississippi to the east. Of the 50 U.S. states, it ranks 31st in area and 25 ...
, and Mexico. The brown pelican is a strictly marine species, primarily inhabiting marine
subtidal The neritic zone (or sublittoral zone) is the relatively shallow part of the ocean above the drop-off of the continental shelf, approximately in depth. From the point of view of marine biology it forms a relatively stable and well-illuminate ...
, warm
estuarine An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime environm ...
, and marine
pelagic The pelagic zone consists of the water column of the open ocean and can be further divided into regions by depth. The word ''pelagic'' is derived . The pelagic zone can be thought of as an imaginary cylinder or water column between the sur ...
waters. It is also found in
mangrove swamps A mangrove is a shrub or tree that grows mainly in coastal saline or brackish water. Mangroves grow in an equatorial climate, typically along coastlines and tidal rivers. They have particular adaptations to take in extra oxygen and remove sal ...
, and prefers shallow waters, especially near salty bays and beaches. It avoids the open sea, seldom venturing more than 20 miles from the coast. Some immature birds may stray to inland freshwater lakes. Its range may also overlap with the Peruvian pelican in some areas along the
Pacific coast Pacific coast may be used to reference any coastline that borders the Pacific Ocean. Geography Americas North America Countries on the western side of North America have a Pacific coast as their western or south-western border. One of th ...
of
South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a considerably smaller portion in the Northern Hemisphere. It can also be described as the southern Subregion#Americas, subregion o ...
. It roosts on rocks, water, rocky cliffs, piers, jetties, sand beaches, and mudflats.


Migration

Most brown pelican populations are resident (nonmigratory) and dispersive (species moving from its birth site to its breeding site, or its breeding site to another breeding site). Some migration is observed, especially in the northern parts of the species's range, but these movements are often erratic, depending on local conditions. While usually restricted to coastal regions, brown pelicans occasionally wander inland, and there are records of
vagrant Vagrancy is the condition of wandering homelessness without regular employment or income. Vagrants usually live in poverty and support themselves by travelling while engaging in begging, scavenging, or petty theft. In Western countries, ...
individuals across much of the interior of North America. The species also occasionally wanders along the coasts of the Americas outside its normal range, with vagrants reported as far north as
Southeast Alaska Southeast Alaska, often abbreviated to southeast or southeastern, and sometimes called the Alaska(n) panhandle, is the southeastern portion of the U.S. state of Alaska, bordered to the east and north by the northern half of the Canadian provi ...
and
Newfoundland Newfoundland and Labrador is the easternmost province of Canada, in the country's Atlantic region. The province comprises the island of Newfoundland and the continental region of Labrador, having a total size of . As of 2025 the population ...
, as far south as central
Chile Chile, officially the Republic of Chile, is a country in western South America. It is the southernmost country in the world and the closest to Antarctica, stretching along a narrow strip of land between the Andes, Andes Mountains and the Paci ...
(well into the range of the closely related Peruvian pelican), and as far east in South America as
Alagoas Alagoas () is one of the 27 federative units of Brazil and is situated in the eastern part of the Northeast Region, Brazil, Northeast Region. It borders: Pernambuco (N and NW); Sergipe (S); Bahia (SW); and the Atlantic Ocean (E). Its capital is ...
. Rare inland vagrants, generally caused by hurricanes or El Niño phenomena, have been reported from the
Colombian Andes The Andean region, located in central Colombia, is the most populated natural region of Colombia. With many mountains, the Andes contain most of the country's urban centers.Interandean Valley, where they remained for at least 161 days. There are four records far inland in
Amazônia Legal Brazil's Legal Amazon (abbreviation BLA), in Portuguese Amazônia Legal (), is the largest socio-geographic division in Brazil, containing all nine states in the Amazon basin. The government designated this region in 1948 based on its studies o ...
, along the Amazon River and its tributaries.


Behavior

The brown pelican is a very gregarious bird; it lives in flocks of both sexes throughout the year. In level flight, brown pelicans fly in groups, with their heads held back on their shoulders and their bills resting on their folded necks. They may fly in a
V formation A V formation is a symmetric V- or Chevron (insignia), chevron-shaped Formation flying, flight formation. In nature, it occurs among goose, geese, swans, ducks, and other bird migration, migratory birds while in human aviation it is used mostly ...
, but usually in regular lines or single file, often low over the water's surface. To exclude water from the nasal passage, they have narrower internal regions of the nostrils.


Feeding

The brown pelican is a
piscivore A piscivore () is a carnivorous animal that primarily eats fish. Fish were the diet of early tetrapod evolution (via water-bound amphibians during the Devonian period); insectivory came next; then in time, the more terrestrially adapted repti ...
, primarily feeding on fish.
Menhaden Menhaden, also known as mossbunker, bunker, and "the most important fish in the sea", are forage fish of the genera ''Brevoortia'' and ''Ethmidium'', two genera of marine fish in the order Clupeiformes. ''Menhaden'' is a blend of ''poghaden'' ...
may account for 90% of its diet, and the
anchovy An anchovy is a small, common forage fish of the Family (biology), family Engraulidae. Most species are found in marine waters, but several will enter brackish water, and some in South America are restricted to fresh water. More than 140 speci ...
supply is particularly important to the brown pelican's nesting success. Other fish preyed on with some regularity includes pigfish, pinfish,
herring Herring are various species of forage fish, belonging to the Order (biology), order Clupeiformes. Herring often move in large Shoaling and schooling, schools around fishing banks and near the coast, found particularly in shallow, temperate wate ...
, sheepshead, silversides, mullets,
sardine Sardine and pilchard are common names for various species of small, oily forage fish in the herring suborder Clupeoidei. The term "sardine" was first used in English during the early 15th century; a somewhat dubious etymology says it com ...
s,
minnow Minnow is the common name for a number of species of small freshwater fish, belonging to several genus, genera of the family Cyprinidae and in particular the subfamily Leuciscinae. They are also known in Ireland as wikt:pinkeen, pinkeens. While ...
s, and topminnows. Brown pelicans residing in Southern California rely especially heavily on pacific sardine as a major food source which can compose up to 26% of their diet, making them one of the top three predators of sardines in the area. Non-fish prey includes
crustacean Crustaceans (from Latin meaning: "those with shells" or "crusted ones") are invertebrate animals that constitute one group of arthropods that are traditionally a part of the subphylum Crustacea (), a large, diverse group of mainly aquatic arthrop ...
s, especially
prawn Prawn is a common name for small aquatic crustaceans with an exoskeleton An exoskeleton () . is a skeleton that is on the exterior of an animal in the form of hardened integument, which both supports the body's shape and protects the intern ...
s, and it occasionally feeds on
amphibian Amphibians are ectothermic, anamniote, anamniotic, tetrapod, four-limbed vertebrate animals that constitute the class (biology), class Amphibia. In its broadest sense, it is a paraphyletic group encompassing all Tetrapod, tetrapods, but excl ...
s and the eggs and nestlings of birds (
egret Egrets ( ) are herons, generally long-legged wading birds, that have white or buff plumage, developing fine plumes (usually milky white) during the breeding season. Egrets are not a biologically distinct group from herons and have the same build ...
s,
common murre The common murre or common guillemot (''Uria aalge'') is a large auk. It has a Subarctic, circumpolar distribution, occurring in low-Arctic and boreal waters in the North Atlantic and North Pacific. It spends most of its time at sea, only coming ...
s and its own species). As the brown pelican flies at a maximum height of above the ocean, it can spot schools of fish while flying. When foraging, it dives bill-first like a
kingfisher Kingfishers are a family, the Alcedinidae, of small to medium-sized, brightly coloured birds in the order Coraciiformes. They have a cosmopolitan distribution, with most species living in the tropical regions of Africa, Asia, and Oceania, ...
, often submerging completely below the surface momentarily as it snaps up prey. Besides its sister species, the Peruvian pelican, this is the only pelican to primarily forage via diving, all other extant pelican merely float on the waters' surface when foraging. Upon surfacing, it spills the water from its throat pouch before swallowing its catch. Only the Peruvian pelican shares this active foraging style (although that species never dives from such a great height), while other pelicans forage more inactively by scooping up corralled fish while swimming on the water surface. It is an occasional target of
kleptoparasitism Kleptoparasitism (originally spelt clepto-parasitism, meaning "parasitism by theft") is a form of feeding in which one animal deliberately takes food from another. The strategy is evolutionarily stable when stealing is less costly than direct f ...
by other fish-eating birds such as
gull Gulls, or colloquially seagulls, are seabirds of the subfamily Larinae. They are most closely related to terns and skimmers, distantly related to auks, and even more distantly related to waders. Until the 21st century, most gulls were placed ...
s,
skua The skuas are a group of predatory seabirds with seven species forming the genus ''Stercorarius'', the only genus in the family Stercorariidae. The three smaller skuas, the Arctic skua, the long-tailed skua, and the pomarine skua, are called ...
s, and
frigatebird Frigatebirds are a Family (biology), family of seabirds called Fregatidae which are found across all tropical and subtropical oceans. The five extant species are classified in a single genus, ''Fregata''. All have predominantly black plumage, l ...
s. They are capable of drinking saline water due to the high capacity of their salt glands to excrete salt.


Breeding

The brown pelican is a
monogamous Monogamy ( ) is a relationship of two individuals in which they form a mutual and exclusive intimate partnership. Having only one partner at any one time, whether for life or serial monogamy, contrasts with various forms of non-monogamy (e.g. ...
breeder within a breeding season, but does not pair for life. Nesting season peaks during March and April. The male chooses a nesting site and performs a display of head movements to attract a female. At the proposed nest site, major courtship displays such as head swaying, bowing, turning, and upright (standing on its legs without any support) are performed by both the sexes. They may also be accompanied by low ''raaa'' calls. Once a pair forms a bond, overt communication between them is minimal. It is a colonial species, with some
colonies A colony is a territory subject to a form of foreign rule, which rules the territory and its indigenous peoples separated from the foreign rulers, the colonizer, and their '' metropole'' (or "mother country"). This separated rule was often or ...
maintained for many years. Probably owing to disturbance, tick infestation, or alteration in food supply, colonies frequently shift. It nests in secluded area, often on islands, vegetated spots among sand dunes, thickets of shrubs and trees, and in
mangrove A mangrove is a shrub or tree that grows mainly in coastal saline water, saline or brackish water. Mangroves grow in an equatorial climate, typically along coastlines and tidal rivers. They have particular adaptations to take in extra oxygen a ...
s, although sometimes on cliffs, and less often in bushes or small trees. Nesting territories are clumped, as individual territories may be at a distance of just from each other. They are usually built by the female from reeds, leaves, pebbles, and sticks, and consist of feather-lined impressions protected with a rim of soil and debris. They are usually found above the ground. Renesting may occur if eggs are lost from the nest early in the breeding season. There are usually two to three, or sometimes even four, oval eggs in a clutch, and only one brood is raised per year. The egg is chalky white, and can measure about in length and in width. Incubation takes 28 to 30 days with both sexes sharing duties, keeping the eggs warm by holding them on or under their webbed feet. It takes 28 to 30 days for the eggs to hatch, and about 63 days to
fledge Fledging is the stage in a flying animal's life between egg, hatching or birth and becoming capable of flight. This term is most frequently applied to birds, but is also used for bats. For altricial birds, those that spend more time in vulnera ...
. After that, the juvenile leave the nest and gather into small groups known as pods. The newly hatched chicks are pink and weigh about . Within 4 to 14 days, they turn gray or black. After that, they develop a coat of white, black or grayish down. Fledging success may be as high as 100% for the first hatched chick, 60% for the second chick, and just 6% for the third chick. The parents regurgitate predigested food for the young to feed upon until they reach their fledging stage. After about 35 days, the young venture out of the nest by walking. The young start flying about 71 to 88 days after hatching. The adults remain with them until some time afterwards and continue to feed them. In the 8- to 10-month period during which they are cared for, the nestling pelicans are fed by regurgitated, partially digested food of around of fish. The young reach sexual maturity (and full adult plumage) at anywhere from three to five years of age. A brown pelican has been recorded to have lived for over 31 years in captivity. File:Pelecanus occidentalis -Smith Island, Chesapeake Bay, Maryland, USA -nest-8cr.jpg, An adult brown pelican with a chick on a nest on Smith Island, Chesapeake Bay, Maryland, USA File:Juvenile pelecanus occidentalis in flight.jpg, Juvenile brown pelican in flight, Bodega Head, California


Predators and parasites

Predation is occasional at colonies, and predators of eggs and young (usually small nestlings are threatened but also occasionally up to fledgling size depending on the size of the predator) can include
gull Gulls, or colloquially seagulls, are seabirds of the subfamily Larinae. They are most closely related to terns and skimmers, distantly related to auks, and even more distantly related to waders. Until the 21st century, most gulls were placed ...
s, raptors (especially
bald eagle The bald eagle (''Haliaeetus leucocephalus'') is a bird of prey found in North America. A sea eagle, it has two known subspecies and forms a species pair with the white-tailed eagle (''Haliaeetus albicilla''), which occupies the same niche ...
s), spiny-tailed iguanas,
alligator An alligator, or colloquially gator, is a large reptile in the genus ''Alligator'' of the Family (biology), family Alligatoridae in the Order (biology), order Crocodilia. The two Extant taxon, extant species are the American alligator (''A. mis ...
s,
vulture A vulture is a bird of prey that scavenges on carrion. There are 23 extant species of vulture (including condors). Old World vultures include 16 living species native to Europe, Africa, and Asia; New World vultures are restricted to Nort ...
s,
feral cat A feral cat or a stray cat is an unowned domestic cat (''Felis catus'') that lives outdoors and avoids human contact; it does not allow itself to be handled or touched, and usually remains hidden from humans. Feral cats may breed over dozens ...
s, feral dogs,
raccoon The raccoon ( or , ''Procyon lotor''), sometimes called the North American, northern or common raccoon (also spelled racoon) to distinguish it from Procyonina, other species of raccoon, is a mammal native to North America. It is the largest ...
s,
fish crow The fish crow (''Corvus ossifragus'') is a species of Corvus, crow associated with wetland habitats in the eastern and southeastern United States. Taxonomy and etymology The fish crow was given its Binomial nomenclature, binomial name by the ...
s, and
corvid Corvidae is a cosmopolitan family of oscine passerine birds that contains the crows, ravens, rooks, magpies, jackdaws, jays, treepies, choughs, and nutcrackers. In colloquial English, they are known as the crow family or corvids. Curre ...
s. Predation is likely reduced if the colony is on an island. Although it is rare,
bobcat The bobcat (''Lynx rufus''), also known as the wildcat, bay lynx, or red lynx, is one of the four extant species within the medium-sized wild cat genus '' Lynx''. Native to North America, it ranges from southern Canada through most of the c ...
s have been documented eating both the offspring and injured adults. Predation on adult brown pelicans is rarely reported, but cases where they have fallen prey to
bald eagle The bald eagle (''Haliaeetus leucocephalus'') is a bird of prey found in North America. A sea eagle, it has two known subspecies and forms a species pair with the white-tailed eagle (''Haliaeetus albicilla''), which occupies the same niche ...
s have been reported. Also,
South American sea lion The South American sea lion (''Otaria flavescens'', formerly ''Otaria byronia''), also called the southern sea lion and the Patagonian sea lion, is a sea lion found on the western and southeastern coasts of South America. It is the Monotypic ta ...
s and unidentified large
shark Sharks are a group of elasmobranch cartilaginous fish characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the head. Modern sharks are classified within the ...
s have been observed to prey on adult brown pelicans by seizing them from beneath while the birds are sitting on ocean waters. In California, adult brown pelicans have become a common prey item for North American river otters. The invasive
red imported fire ant ''Solenopsis invicta'', the fire ant, or red imported fire ant (RIFA), is a species of ant native to South America. A member of the genus ''Fire ant, Solenopsis'' in the subfamily Myrmicinae, it was Species description, described by Swiss ento ...
is known to prey on hatchlings. Like all pelicans, brown pelicans are highly sensitive to disturbances by humans (including tourists or fishermen) at their nests, and may even abandon their nests.Brown Pelican
Smithsonian's National Zoological Park
Due to their size, non-nesting adults are rarely predated. Brown pelicans have several parasitic worms such as ''Petagiger'', ''Echinochasmus'', ''Phagicola longus'', ''Mesostephanus appendiculatoides'', ''Contracaecum multipapillatum'', and ''Contracaecum bioccai'', from its prey diet of black mullets, white mullets, and other fish species.


Relationship with humans

The brown pelican is now a staple of crowded coastal regions and is at some risk by fishermen (monofilament fishing line and hooks) and boaters. In the early twentieth century, hunting was a major cause of its death, and people still hunt adults for their feathers and collect eggs on the Caribbean coasts, in
Latin America Latin America is the cultural region of the Americas where Romance languages are predominantly spoken, primarily Spanish language, Spanish and Portuguese language, Portuguese. Latin America is defined according to cultural identity, not geogr ...
, and occasionally in the United States, even though it is protected under the
Migratory Bird Treaty Act of 1918 The Migratory Bird Treaty Act of 1918 (MBTA), codified at (although §709 is omitted), is a United States federal law, first enacted in 1918 to implement the convention for the protection of migratory birds between the United States and Canada. ...
.


Depictions in culture

The brown pelican is the
national bird This is a list of national birds, including official birds of overseas territories and other states described as nations. Most species in the list are officially designated. Some species hold only an "unofficial" status. The column is marked a ...
of Saint Martin,
Barbados Barbados, officially the Republic of Barbados, is an island country in the Atlantic Ocean. It is part of the Lesser Antilles of the West Indies and the easternmost island of the Caribbean region. It lies on the boundary of the South American ...
,
Saint Kitts and Nevis Saint Kitts and Nevis, officially the Federation of Saint Christopher (St Kitts) and Nevis, is an island country consisting of the two islands of Saint Kitts and Nevis, both located in the West Indies, in the Leeward Islands chain of the Less ...
, and the
Turks and Caicos Islands The Turks and Caicos Islands (abbreviated TCI; and ) are a British Overseas Territory consisting of the larger Caicos Islands and smaller Turks Islands, two groups of tropical islands in the Lucayan Archipelago of the Atlantic Ocean and no ...
. In 1902, it was made a part of the official Louisiana seal and, in 1912, a pelican and her young became part of the Flag of Louisiana as well. One of Louisiana's state nicknames is "The Pelican State", and the brown pelican is the official state bird of Louisiana. It is one of the mascots of
Tulane University The Tulane University of Louisiana (commonly referred to as Tulane University) is a private research university in New Orleans, Louisiana, United States. Founded as the Medical College of Louisiana in 1834 by a cohort of medical doctors, it b ...
, present on its seal, and is also present on the crest of the
University of the West Indies The University of the West Indies (UWI), originally University College of the West Indies, is a public university system established to serve the higher education needs of the residents of 18 English-speaking countries and territories in t ...
. The
National Basketball Association The National Basketball Association (NBA) is a professional basketball league in North America composed of 30 teams (29 in the United States and 1 in Canada). The NBA is one of the major professional sports leagues in the United States and Ca ...
(NBA)'s
New Orleans Pelicans The New Orleans Pelicans are an American professional basketball team based in New Orleans. The Pelicans compete in the National Basketball Association (NBA) as a member of the Southwest Division (NBA), Southwest Division of the Western Confere ...
are named in the honor of the brown pelican. In the 1993 film '' The Pelican Brief'', based on the novel of the same name by
John Grisham John Ray Grisham Jr. (; born February 8, 1955) is an American novelist, lawyer, and former politician, known for his best-selling legal thrillers. According to the Academy of Achievement, American Academy of Achievement, Grisham has written 37 ...
, a legal brief speculates that the assassins of two supreme court justices were motivated by a desire to drill for oil on a Louisiana marshland that was a habitat of the endangered brown pelican. In the same year, ''
Jurassic Park ''Jurassic Park'', later referred to as ''Jurassic World'', is an American science fiction media franchise created by Michael Crichton, centered on a disastrous attempt to create a theme park of De-extinction#Cloning, cloned dinosaurs. It bega ...
'' showed a pod of brown pelicans at the end of the film. In 1998, American conductor David Woodard performed a requiem for a California brown pelican on the seaward limit of the
berm A berm is a level space, shelf, or raised barrier (usually made of Soil compaction, compacted soil) separating areas in a vertical way, especially partway up a long slope. It can serve as a terrace road, track, path, a fortification line, a b ...
of a beach where the animal had fallen. In the 2003
Disney The Walt Disney Company, commonly referred to as simply Disney, is an American multinational mass media and entertainment industry, entertainment conglomerate (company), conglomerate headquartered at the Walt Disney Studios (Burbank), Walt Di ...
/
Pixar Pixar (), doing business as Pixar Animation Studios, is an American animation studio based in Emeryville, California, known for its critically and commercially successful computer-animated feature films. Pixar is a subsidiary of Walt Disney ...
film ''
Finding Nemo ''Finding Nemo'' is a 2003 American animated comedy-drama adventure film produced by Pixar Animation Studios for Walt Disney Pictures. The film was directed by Andrew Stanton, co-directed by Lee Unkrich, and produced by Graham Walters, from ...
'', a brown pelican (voiced by
Geoffrey Rush Geoffrey Roy Rush (born 6 July 1951) is an Australian actor. Known for often playing eccentric roles on both stage and screen, he has received List of awards and nominations received by Geoffrey Rush, numerous accolades, including an Academy Aw ...
in an Australian accent) was illustrated as a friendly, virtuous talking character named Nigel.


Status and conservation

Since 1988, the brown pelican has been rated as
least concern A least-concern species is a species that has been evaluated and categorized by the International Union for Conservation of Nature (IUCN) as not being a focus of wildlife conservation because the specific species is still plentiful in the wil ...
 on the 
IUCN Red List The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is an inventory of the global conservation status and extinction risk of biological ...
 of Endangered species based on its large range—greater than 20,000 km2 (7700 mi2)—and an increasing population trend. The population size is also well beyond the threshold for
vulnerable species A vulnerable species is a species which has been Conservation status, categorized by the International Union for Conservation of Nature as being threatened species, threatened with extinction unless the circumstances that are threatened species, ...
. The
nominate race In biological classification, subspecies (: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (morphology), but that can successfully interbreed. ...
population is thought to number at least 290,000 in the West Indies, and 650,000 globally. In 1903,
Theodore Roosevelt Theodore Roosevelt Jr. (October 27, 1858 – January 6, 1919), also known as Teddy or T.R., was the 26th president of the United States, serving from 1901 to 1909. Roosevelt previously was involved in New York (state), New York politics, incl ...
set aside Pelican Island, now known as Pelican Island National Wildlife Refuge, to solely protect the brown pelican from hunters. Starting in the 1940s with the invention and extensive use of pesticides such as DDT, the brown pelican population had drastically declined due to a lack of breeding success. By the 1960s, it had almost disappeared along the Gulf Coast and, in
southern California Southern California (commonly shortened to SoCal) is a geographic and Cultural area, cultural List of regions of California, region that generally comprises the southern portion of the U.S. state of California. Its densely populated coastal reg ...
, it had suffered almost total reproductive failure, due to DDT usage in the United States. The brown pelican was listed under the United States Endangered Species Act from 1970 to 2009. A research group from the
University of Tampa The University of Tampa (UTampa, UT or Tampa U) is a private university in Tampa, Florida. It is accredited by the Southern Association of Colleges and Schools. UTampa offers more than 200 programs of study, including 19 master's degrees and a br ...
, headed by Ralph Schreiber, conducted research in
Tampa Bay Tampa Bay is a large natural harbor and shallow estuary connected to the Gulf of Mexico on the west-central coast of Florida, comprising Hillsborough Bay, McKay Bay, Old Tampa Bay, Middle Tampa Bay, and Lower Tampa Bay. The largest freshwater i ...
, and found that DDT caused the pelican eggshells to be too thin to support the embryo to maturity. In 1972, the
United States Environmental Protection Agency The Environmental Protection Agency (EPA) is an independent agency of the United States government tasked with environmental protection matters. President Richard Nixon proposed the establishment of EPA on July 9, 1970; it began operation on De ...
(USEPA) banned DDT usage in the United States and limited the use of other pesticides. There has been a decline in chemical contaminant levels in brown pelican eggs since then, and a corresponding increase in its nesting success. It became extinct in 1963 in
Louisiana Louisiana ( ; ; ) is a state in the Deep South and South Central regions of the United States. It borders Texas to the west, Arkansas to the north, and Mississippi to the east. Of the 50 U.S. states, it ranks 31st in area and 25 ...
. Between 1968 and 1980, the
Louisiana Department of Wildlife and Fisheries The Louisiana Department of Wildlife and Fisheries (LDWF) is a state agency of Louisiana that maintains state wildlife and fishery areas. The agency is headquartered in the capital city of Baton Rouge. Mission The Louisiana Department of Wildlife ...
' reintroduction program re-established the brown pelican, and its population numbers in California and Texas were restored due to improved reproduction and natural recolonization of the species. By 1985, its population in the eastern United States, including
Florida Florida ( ; ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders the Gulf of Mexico to the west, Alabama to the northwest, Georgia (U.S. state), Georgia to the north, the Atlantic ...
,
Georgia Georgia most commonly refers to: * Georgia (country), a country in the South Caucasus * Georgia (U.S. state), a state in the southeastern United States Georgia may also refer to: People and fictional characters * Georgia (name), a list of pe ...
,
South Carolina South Carolina ( ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders North Carolina to the north and northeast, the Atlantic Ocean to the southeast, and Georgia (U.S. state), Georg ...
,
Alabama Alabama ( ) is a U.S. state, state in the Southeastern United States, Southeastern and Deep South, Deep Southern regions of the United States. It borders Tennessee to the north, Georgia (U.S. state), Georgia to the east, Florida and the Gu ...
, and northward along the Atlantic Coast, had recovered and the species was removed from the Endangered Species List. Its population has grown by about 68% per decade over a period of 40 years in North America, and this trend appears to be continuing. It is still listed as endangered in the Pacific Coast region of its range and in the southern and central United States. Although the United States Gulf Coast populations in Louisiana and Texas are still listed as endangered, they were recently estimated in 2009 about 12,000 breeding pairs. Since that time the
Deepwater Horizon oil spill The ''Deepwater Horizon'' oil spill was an environmental disaster off the coast of the United States in the Gulf of Mexico, on the BP-operated Macondo Prospect. It is considered the largest marine oil spill in the history of the petroleum in ...
has adversely affected populations, and current population figures are not available.


Indicator species

The brown pelican abundance has steadily recovered from the drastic population decreases in the 1940s, however bottom up control threatens the
Southern California Southern California (commonly shortened to SoCal) is a geographic and Cultural area, cultural List of regions of California, region that generally comprises the southern portion of the U.S. state of California. Its densely populated coastal reg ...
populations as food sources become diminished. It is common for
forage fish Forage fish, also called prey fish or bait fish, are small pelagic fish that feed on planktons (i.e. planktivores) and other small aquatic organisms (e.g. krill). They are in turn preyed upon by various predators including larger fish, seabirds ...
populations to experience regular fluctuations, however there has been a consistent decrease in the Pacific sardine population beginning as early as 2014. In 2019 these declines were found to have reached levels which were a mere 10% of the highest reported abundances. Fluctuations in sardine populations have largely been attributed to bottom-up control, primarily including climate variability and ocean temperature. The significant decrease in pacific sardine population can be linked to the levels of nitrogen within their habitat, a limiting factor in plankton production. Pacific sardines in the California current system rely on wind driven upwelling to push cooler, nitrogen rich waters towards the surface, maintaining a sustainable, nutrient abundant environment. Continued environmental disruptions, such as
El Niño EL, El or el may refer to: Arts and entertainment Fictional entities * El, a character from the manga series ''Shugo Chara!'' by Peach-Pit * Eleven (''Stranger Things'') (El), a fictional character in the TV series ''Stranger Things'' * El, fami ...
, rising ocean temperatures, and increased commercial fishing, have drastic effects on
nutrient cycling A nutrient cycle (or ecological recycling) is the movement and exchange of inorganic and organic matter back into the production of matter. Energy flow is a unidirectional and noncyclic pathway, whereas the movement of mineral nutrients is cyc ...
within the
California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
current system, leading to lasting impacts on Pacific sardine productivity and
reproductive success Reproductive success is an individual's production of offspring per breeding event or lifetime. This is not limited by the number of offspring produced by one individual, but also the reproductive success of these offspring themselves. Reproduct ...
. The brown pelican has been predicted to have high vulnerability to declining sardine populations . At the lowest levels of sardine abundance, the brown pelican population has been predicted to decline up to 50%. Even with a more moderate decline in sardine abundance (50% relative abundance), brown pelicans have been predicted to decrease by up to 27%. A recent decline in brown pelican breeding success coincides with the population decline of the Pacific sardine. Between 2014 and 2016, brown pelicans experienced a continuous breeding failure. These breeding failures have been characterized by decreased numbers of pelicans arriving at nesting colonies, large scale abandonment and early migration due to an inability to feed hatchlings, and sub-optimal breeding by those who do attempt to breed. Breeding success is greatly reduced by oceanic anomalies, specifically warm-phase anomalies that increase the intensity of upwellings. Increased upwellings disrupt marine productivity and forage fish availability. These trends have important implications for the health and conservation of brown pelicans, as well as other seabirds. Seabirds have become increasingly important as an
indicator species A bioindicator is any species (an indicator species) or group of species whose function, population, or status can reveal the qualitative status of the environment. The most common indicator species are animals. For example, copepods and other sma ...
. They are often used in order to indirectly track changes in fish stocks, ecosystem health, and
climate change Present-day climate change includes both global warming—the ongoing increase in Global surface temperature, global average temperature—and its wider effects on Earth's climate system. Climate variability and change, Climate change in ...
. Environmental changes tend to have fast acting impacts on marine bird populations due to the simplicity of their
trophic cascade Trophic cascades are powerful indirect interactions that can control entire ecosystems, occurring when a trophic level in a food web is suppressed. For example, a top-down cascade will occur if predators are effective enough in predation to redu ...
, allowing for complex, long term trends in ecosystem health and resources to be easily realized and tracked. Brown pelicans have proven to be a useful indicator in determining the effects of the well-established fishing industry in Southern California. Sardine fishery in the
Gulf of California The Gulf of California (), also known as the Sea of Cortés (''Mar de Cortés'') or Sea of Cortez, or less commonly as the Vermilion Sea (''Mar Vermejo''), is a marginal sea of the Pacific Ocean that separates the Baja California peninsula from ...
has been showing signs of overfishing since the early 1990s. Sardine population and abundance, however, is difficult to monitor and obtain indicators for. Since lacking food availability has negative implications for breeding success in seabirds, seabird diet, and breeding success have been used to indirectly measure the population status of the fish they feed on. This model has been shown to work using brown pelicans as an indicator species. As the proportion of sardines in the brown pelican's diet decreases, the success of
fisheries Fishery can mean either the enterprise of raising or harvesting fish and other aquatic life or, more commonly, the site where such enterprise takes place ( a.k.a., fishing grounds). Commercial fisheries include wild fisheries and fish farm ...
declines to a lesser extent. When eventually the sardine abundance has declined enough for brown pelicans to move away and begin feeding on other forage fish, commercial fishing still would be fishing in significant numbers. This indicates that even when fisheries are not seeing signs of declining sardine abundance, brown pelicans may have already been affected to the point of locating other food sources. This availability of sardines may decline even further during El Niño anomalies, when
thermocline A thermocline (also known as the thermal layer or the metalimnion in lakes) is a distinct layer based on temperature within a large body of fluid (e.g. water, as in an ocean or lake; or air, e.g. an atmosphere) with a high gradient of distinct te ...
s prevent brown pelicans from reaching their prey. Brown pelican diet will mostly indicate declines in sardine abundance for fisheries during the same season, as brown pelicans feed mostly on the same adult fish that are commercially fished. Although brown pelicans serve as an important indicator species for fisheries, declining sardine abundance due to both climate changes and overfishing have huge implications on overall ecosystem health, within or outside the individual trophic cascade.


Explanatory notes


References


External links

* *
Field Guide Page
on
Flickr Flickr ( ) is an image hosting service, image and Online video platform, video hosting service, as well as an online community, founded in Canada and headquartered in the United States. It was created by Ludicorp in 2004 and was previously a co ...
* {{Authority control Articles containing video clips Birds described in 1766 Birds of Central America Birds of Colombia Birds of Ecuador Birds of Mexico Birds of the Caribbean Birds of the Dominican Republic Birds of Venezuela Galápagos Islands coastal fauna Least concern biota of North America Least concern biota of the United States Native birds of the Southeastern United States Pelecanus Symbols of Louisiana Taxa named by Carl Linnaeus