White-breasted cormorant

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White-breasted cormorant
White-breasted cormorant (Phalacrocorax lucidus).jpg
Lake Ziway, Ethiopia
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Suliformes
Family: Phalacrocoracidae
Genus: Phalacrocorax
Species:
P. lucidus
Binomial name
Phalacrocorax lucidus
Phalacrocorax lucidus map.svg
Range, excluding isolated northern and western populations [1]
  breeding range
  non-breeding range
Synonyms

Phalacrocorax carbo lucidus

The white-breasted cormorant (Phalacrocorax lucidus) is a species of cormorant closely related to the widely distributed great cormorant. While debate persists over whether it constitutes a distinct species or a regional variant of the great cormorant, its distinguishing features include a white breast and a preference for freshwater habitats among its subpopulations. [2] The species should not be conflated with the smaller and morphologically distinct endemic South Australian black-faced cormorant, which occasionally shares the common name "white-breasted cormorant."

Contents

Taxonomy and description

The white-breasted cormorant (Phalacrocorax lucidus) is a member of the cormorant family Phalacrocoracidae. Its taxonomic status has been under discussion for some decades [3] and several questions still have not been definitively settled. Phalacrocorax lucidus sometimes is treated as a subspecies of the great cormorant, Phalacrocorax carbo lucidus, but some authorities (e.g. Sibley & Monroe, 1990, Sinclair, Hockey and Tarboton, 2002) retain its original treatment as an allospecies in the P. carbo superspecific group, in which case it is referred to as Phalacrocorax lucidus. A black-necked form originally classified as Phalacrocorax patricki or Phalacrocorax carbo patricki is now regarded as synonymous with Phalacrocorax lucidus.

As its name suggests, the 80–100 centimetres (31–39 in) long white-breasted cormorant has a white neck and breast when adult, and the white area tends to increase as the bird becomes more mature. In other respects it is a large cormorant generally resembling the great cormorant.

The smaller and very different southern Australian black-faced cormorant, Phalacrocorax fuscescens, is also sometimes known as the white-breasted cormorant.

Distribution

Dark gular skin is evident when breeding starts White-Breasted Cormorant (Phalacrocorax lucidus).jpg
Dark gular skin is evident when breeding starts

The white-breasted cormorant is the only form of great cormorant found in Sub-Saharan Africa, the only form that has strictly freshwater populations and the only form with a white breast and throat; it does however interbreed freely with dark-breasted forms in central Africa. [2] The West African population predominantly inhabits the Sahelian Upwelling Marine Ecoregion, stretching from Morocco to Guinea along the Atlantic coast, and its breeding grounds extend from the Cape Verde Islands to the coastline. In 2006, it was estimated that this population comprised approximately 35,000 individuals, according to data from Wetlands International. [4] The species has important nesting sites in Djoudj National Park in Senegal. [5] It can be found from Angola to the Cape of Good Hope and northwards on the east coast to Mozambique and occurs around the entire Southern African coastline, but it is not clear whether the coastal populations are separate from the inland populations. On the African mainland it occurs more frequently in eastern and southern parts, rather than in the drier western regions, where it usually is found only on perennial rivers and dams. On inland waters it commonly occurs together with the reed cormorant and the African darter, but it is ecologically separated from these species by its fishing habits and the size and nature of its prey. [2] There are also inland populations in Nigeria and around Lake Chad, and in eastern and southern Africa from Sudan southwards. It can be found around the Red Sea, where it is sometimes referred to as the Red Sea white-breasted cormorant.

Diet

White-breasted cormorants are opportunistic feeders in fish-rich marine environments. [4]

A 2012 study on West African populations revealed significant dietary variations across different sites, with a few dominant fish species in each location. The majority of prey fish were coastal species, some capable of entering brackish and fresh waters. Predominantly, the consumed fish were benthic or bentho-pelagic, ranging from 10 to 20 cm in size. These findings indicate the species' capacity to adapt to fluctuations in fish availability across environments. [4]

Related Research Articles

<span class="mw-page-title-main">Pelican</span> Genus of large water birds with a throat pouch

Pelicans 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 swallowing. They have predominantly pale plumage, except for the brown and Peruvian pelicans. The bills, pouches, and bare facial skin of all pelicans become brightly coloured before the breeding season.

<span class="mw-page-title-main">Cormorant</span> Family of aquatic birds

Phalacrocoracidae is a family of approximately 40 species of aquatic birds commonly known as cormorants and shags. Several different classifications of the family have been proposed, but in 2021 the International Ornithologists' Union (IOU) adopted a consensus taxonomy of seven genera. The great cormorant and the common shag are the only two species of the family commonly encountered in Britain and Ireland and "cormorant" and "shag" appellations have been later assigned to different species in the family somewhat haphazardly.

<span class="mw-page-title-main">Double-crested cormorant</span> Species of bird

The double-crested cormorant is a member of the cormorant family of water birds. It is found near rivers and lakes and in coastal areas and is widely distributed across North America, from the Aleutian Islands in Alaska down to Florida and Mexico. Measuring 70–90 cm (28–35 in) in length, it is entirely black except for a bare patch of orange-yellow facial skin and some extra plumage that it exhibits in the breeding season when it grows a double crest in which black feathers are mingled with white. Five subspecies are recognized. It mainly eats fish and hunts by swimming and diving. Its feathers, like all cormorants, are not waterproof, and it must dry them out after spending time in the water. Once threatened by the use of DDT, the numbers of this bird have increased markedly in recent years.

<i>Phalacrocorax</i> Genus of birds

Phalacrocorax is a genus of fish-eating birds in the cormorant family Phalacrocoracidae. Members of this genus are also known as the Old World cormorants.

<span class="mw-page-title-main">Pelagic cormorant</span> Species of bird

The pelagic cormorant, also known as Baird's cormorant or violet-green cormorant, is a small member of the cormorant family Phalacrocoracidae. Analogous to other smallish cormorants, it is also called the pelagic shag occasionally. This seabird lives along the coasts of the northern Pacific; during winter it can also be found in the open ocean. Pelagic cormorants have relatively short wings due to their need for economical movement underwater, and consequently have the highest flight costs of any bird.

<span class="mw-page-title-main">Little pied cormorant</span> Species of bird

The little pied cormorant, little shag or kawaupaka is a common Australasian waterbird, found around the coasts, islands, estuaries, and inland waters of Australia, New Guinea, New Zealand, Timor-Leste, and Indonesia, and around the islands of the south-western Pacific and the subantarctic. It is a small short-billed cormorant usually black above and white below with a yellow bill and small crest, although a mostly black white-throated form predominates in New Zealand. Three subspecies are recognised. Until recently most authorities referred to this species as Phalacrocorax melanoleucos.

<span class="mw-page-title-main">Great cormorant</span> Species of bird

The great cormorant, known as the black shag or kawau in New Zealand, formerly also known as the great black cormorant across the Northern Hemisphere, the black cormorant in Australia, and the large cormorant in India, is a widespread member of the cormorant family of seabirds. The genus name is Latinised Ancient Greek, from φαλακρός and κόραξ, and carbo is Latin for "charcoal".

<span class="mw-page-title-main">European shag</span> Species of bird

The European shag or common shag is a species of cormorant. It is the only member of the monotypic genus Gulosus. It breeds around the rocky coasts of western and southern Europe, southwest Asia and north Africa, mainly wintering in its breeding range except for the northernmost birds. In Britain this seabird is usually referred to as simply the shag. The scientific genus name derives from the Latin for glutton. The species name aristotelis commemorates the Greek philosopher Aristotle.

<span class="mw-page-title-main">Indian cormorant</span> Species of bird from Asia

The Indian cormorant or Indian shag is a member of the cormorant family. It is found mainly along the inland waters of the Indian Subcontinent but extends west to Sind and east to Thailand and Cambodia. It is a gregarious species that can be easily distinguished from the similar sized little cormorant by its blue eyes, small head with a sloping forehead and a long narrow bill ending in a hooked tip.

<span class="mw-page-title-main">Little cormorant</span> Species of bird

The little cormorant is a member of the cormorant family of seabirds. Slightly smaller than the Indian cormorant it lacks a peaked head and has a shorter beak. It is widely distributed across the Indian Subcontinent and extends east to Java, where it is sometimes called the Javanese cormorant. It forages singly or sometimes in loose groups in lowland freshwater bodies, including small ponds, large lakes, streams and sometimes coastal estuaries. Like other cormorants, it is often found perched on a waterside rock with its wings spread out after coming out of the water. The entire body is black in the breeding season but the plumage is brownish, and the throat has a small whitish patch in the non-breeding season. These birds breed gregariously in trees, often joining other waterbirds at heronries.

<span class="mw-page-title-main">Little black cormorant</span> Species of bird

The little black cormorant is a member of the cormorant family of seabirds. It is common in smaller rivers and lakes throughout most areas of Australia and northern New Zealand, where it is known as the little black shag. It is around sixty centimetres long, and is all black with blue-green eyes.

<span class="mw-page-title-main">Cape cormorant</span> Species of bird

The Cape cormorant or Cape shag is a bird endemic to the southwestern coasts of Africa.

<span class="mw-page-title-main">Socotra cormorant</span> Species of bird

The Socotra cormorant is a threatened species of cormorant that is endemic to the Persian Gulf and the south-east coast of the Arabian Peninsula. It is also sometimes known as the Socotran cormorant or, more rarely, as the Socotra shag. Individuals occasionally migrate as far west as the Red Sea coast. Despite its name, it was only confirmed in 2005 that it breeds on the Socotra islands in the Indian Ocean.

<span class="mw-page-title-main">Black-faced cormorant</span> Species of bird

The black-faced cormorant, also known as the black-faced shag, is a medium-sized member of the cormorant family. Upperparts, including facial skin and bill, are black, with white underparts. It is endemic to coastal regions of southern Australia.

<span class="mw-page-title-main">Crowned cormorant</span> Species of birds

The crowned cormorant or kuifkopduiker, 'Fringe-head diver', is a small cormorant that is endemic to the waters of the cold Benguela Current of southern Africa. It is an exclusively coastal species and is not found more than 10 km (6 mi) away from land. This species is related to the reed cormorant, and was formerly considered to the same species.

<span class="mw-page-title-main">Imperial shag</span> Species of bird

The imperial shag or imperial cormorant is a black and white cormorant native to southern South America, primarily in rocky coastal regions, but locally also at large inland lakes. Some taxonomic authorities, including the International Ornithologists' Union, place it in the genus Leucocarbo, others in the genus Phalacrocorax. It is also known as the blue-eyed shag, blue-eyed cormorant and by many other names, and is one of a larger group of cormorants called blue-eyed shags. The taxonomy is very complex, and several former subspecies are often considered separate species.

<span class="mw-page-title-main">Red-legged cormorant</span> Species of bird

The red-legged cormorant, also known as the red-legged shag, red-footed cormorant, red-footed shag, Gaimard's cormorant and grey cormorant, is a species of cormorant resident to the coastline of South America. It is the only member of the genus Poikilocarbo. It is non-colonial unlike most seabirds. The red-legged cormorant has not been observed wing-spreading, which is unusual among cormorant species.

<span class="mw-page-title-main">Chatham shag</span> Species of bird

The Chatham shag, also known as the Chatham Island shag, is a species of bird in the cormorant and shag family, Phalacrocoracidae. It is endemic to the Chatham Islands of New Zealand. For a long time the species was placed in the genus Phalacrocorax; today it is mostly placed with the other blue-eyed shags of New Zealand and Antarctica in the genus Leucocarbo. Its closest relative is the Otago shag of South Island.

<span class="mw-page-title-main">Suliformes</span> Order of birds

The order Suliformes is an order recognised by the International Ornithologist's Union. In regard to the recent evidence that the traditional Pelecaniformes is polyphyletic, it has been suggested that the group be divided to reflect the true evolutionary relationships; a 2017 study indicated that they are most closely related to Otidiformes (bustards) and Ciconiiformes (storks).

<span class="mw-page-title-main">Antarctic shag</span> Species of bird

The Antarctic shag, sometimes referred to as the imperial cormorant, king cormorant, imperial shag, blue-eyed shag or Antarctic cormorant, is the only species of the cormorant family found in the Antarctic. It is sometimes considered conspecific with the Imperial shag.

References

  1. Nelson, J. Bryan (2006). Pelicans, cormorants and their relatives: Pelecanidae, Sulidae, Phalacrocoracidae, Anhingidae, Fregatidae, Phaethontidae (Bird families of the world, Vol. 17 ed.). New York: Oxford University Press. ISBN   9780198577270.
  2. 1 2 3 J.A. Harrison, D.G. Allan, L.G. Underhill, M. Herremans, A.J. Tree, V. Parker, C.J. Brown (eds). The Atlas of Southern African Birds. Published by BirdLife South Africa, P.O. Box 84394, Greenside 2034, Johannesburg, South Africa 1997 ISBN   0 620 20729 9
  3. Brooke RK, Cooper J, Shelton PA, Crawford RJM. Taxonomy, distribution, population size, breeding & conservation of the Whitebreasted Cormorant, Phalacrocorax carbo, on the Southern African coast. Gerfaut 72, pp 188–220 1982.
  4. 1 2 3 Veen, Jan; Mullié, Wim C.; Veen, Thor (2012). "The Diet of the White-Breasted Cormorant Phalacrocorax carbo lucidus Along the Atlantic Coast of West Africa". Ardea. 100 (2): 137–148. doi:10.5253/078.100.0205. ISSN   0373-2266.
  5. Gherardi, Franccesa; Corti, Claudia; Gualtieri, Manuela (2009-12-29). Biodiversity Conservation and Habitat Management - Volume I. EOLSS Publications. p. 317. ISBN   978-1-905839-20-9.