Sea eagle

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Sea eagles
Temporal range: Middle Miocene–Recent 16–0  Ma [1]
The Bald Eagle By Carole Robertson.jpg
Bald eagle
(Haliaeetus leucocephalus)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Accipitriformes
Family: Accipitridae
Subfamily: Haliaeetinae
Savigny, 1809
Genus

A sea eagle or fish eagle (also called erne or ern, mostly in reference to the white-tailed eagle) is any of the birds of prey in the subfamily Haliaeetinae [2] of the bird of prey family Accipitridae. Ten extant species exist, currently described with this label.

Contents

The subfamily has a significant reach, with a scholarly article in 2005 reporting that they were "found in riverine and coastal habitat[s] throughout the world". However, Haliaeetinae inhabited areas have experienced particular threats given the context of human impacts on the environment. [3]

Taxonomy and evolution

The genus Haliaeetus was introduced in 1809 by French naturalist Marie Jules César Savigny in his chapter on birds in the Description de l'Égypte . [4] [5] The two fish eagles in the genus Ichthyophaga were found to lie within Haliaeetus in a genetic study in 2005. [3] They were then moved accordingly. They are very similar to the tropical Haliaeetus species. A prehistoric (i.e. extinct before 1500) form from Maui in the Hawaiian Islands may represent a species or subspecies in this genus.

The relationships to other genera in the family are less clear; they have long been considered closer to the genus Milvus (kites) than to the true eagles in the genus Aquila on the basis of their morphology and display behaviour; [6] [7] more recent genetic evidence agrees with this, but points to their being related to the genus Buteo (buzzards/hawks), as well, a relationship not previously thought close. [8]

A 2005 molecular study found that the genus is paraphyletic and subsumes Ichthyophaga , the species diverging into a temperate and tropical group. [9]

Evolution

Haliaeetus is possibly one of the oldest genera of living birds. A distal left tarsometatarsus (DPC 1652) recovered from early Oligocene deposits of Fayyum, Egypt (Jebel Qatrani Formation, about 33 million years ago (Mya)) is similar in general pattern and some details to that of a modern sea eagle. [10] The genus was present in the middle Miocene (12-16 Mya) with certainty. [11]

The origin of the sea eagles and fishing eagles is probably in the general area of the Bay of Bengal. During the Eocene/Oligocene, as the Indian subcontinent slowly collided with Eurasia, this was a vast expanse of fairly shallow ocean; the initial sea eagle divergence seems to have resulted in the four tropical (and Southern Hemisphere subtropical) species living around the Indian Ocean today. The Central Asian Pallas's sea eagle's relationships to the other taxa is more obscure; it seems closer to the three Holarctic species which evolved later and may be an early offshoot of this northward expansion; it does not have the hefty yellow bill of the northern forms, retaining a smaller, darker beak like the tropical species. [8]

The rate of molecular evolution in Haliaeetus is fairly slow, as is to be expected in long-lived birds which take years to successfully reproduce. In the mtDNA cytochrome b gene, a mutation rate of 0.5–0.7% per million years (if assuming an Early Miocene divergence) or maybe as little as 0.25–0.3% per million years (for a Late Eocene divergence) has been shown. [8]

Issues in the modern era

The Haliaeetinae subfamily is an especially threatened collection of creatures within the broader Accipitridae species, according to the academic journal Molecular Phylogenetics and Evolution , given the "anthropogenic factors" involved. The publication reported in 2005 that prior trends had meant that sea eagles could be "found in riverine and coastal habitat[s] throughout the world". In terms of international scientific campaigns, the Convention on International Trade in Endangered Species (CITES) protects all entities in the broader species, including sea eagles. [3]

Species

Current sea eagles

ImageGenusLiving Species
Haliaeetus leucocephalus4 (softeis).jpg Haliaeetus Savigny, 1809
White bellied sea eagle 4.jpg Icthyophaga (Lesson, 1843)

Description

Sea eagles vary in size, from Sanford's sea eagle, averaging 2–2.7 kilograms (4.4–6.0 lb), to Steller's sea eagle, weighing up to 9 kg (20 lb). [6] At up to 6.9 kg (15 lb 3 oz), the white-tailed eagle is the largest eagle in Europe. Bald eagles can weigh up to 6.3 kg (13 lb 14 oz), making them the largest eagle native to North America. There are exceptional records of even heavier individuals in both the white-tailed and bald eagles, although not surpassing the largest Steller's sea eagles. The white-bellied sea eagle can weigh up to 4.5 kg (9 lb 15 oz). [6] They are generally overall brown (from rich brown to dull grey-brown), often with white to the head, tail or underparts. Some of the species have an all-yellow beak as adults, which is unusual among eagles. [6]

Their diets consist mainly of fish, aquatic birds, and small mammals. Nests are typically very large and positioned in a tree, but sometimes on a cliff. [6]

The tail is entirely white in adult Haliaeetus species except for Sanford's, white-bellied, and Pallas's. Three species pairs exist: white-tailed and bald eagles, Sanford's and white-bellied sea eagles, and the African and Madagascar fish eagles, [8] each of these consists of a white- and a tan-headed species.

A sea eagle in the flag of Naval Reconnaissance Battalion of Finnish Navy Meritiedustelupataljoona.svg
A sea eagle in the flag of Naval Reconnaissance Battalion of Finnish Navy

See also

Related Research Articles

<span class="mw-page-title-main">Bald eagle</span> Bird of prey species of North America

The bald eagle 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, which occupies the same niche as the bald eagle in the Palearctic. Its range includes most of Canada and Alaska, all of the contiguous United States, and northern Mexico. It is found near large bodies of open water with an abundant food supply and old-growth trees for nesting.

<span class="mw-page-title-main">Eagle</span> Large carnivore bird

Eagle is the common name for the golden eagle, bald eagle, and other birds of prey in the family Accipitridae. Eagles belong to several groups of genera, some of which are closely related. True eagles comprise the genus Aquila. Most of the 68 species of eagles are from Eurasia and Africa. Outside this area, just 14 species can be found—two in North America, nine in Central and South America, and three in Australia.

<span class="mw-page-title-main">Haast's eagle</span> Extinct species of bird

Haast's eagle is an extinct species of eagle that lived in the South Island of New Zealand, commonly accepted to be the pouākai of Māori mythology. It is the largest eagle known to have existed, with an estimated weight of 15 kilograms, compared to the next-largest and extant harpy eagle, at up to 9 kg (20 lb). Its massive size is explained as an evolutionary response to the size of its prey—the flightless moa—the largest of which could weigh 230 kg (510 lb). Haast's eagle became extinct around 1445, following the arrival of the Māori, who hunted moa to extinction, introduced the Polynesian rat, and destroyed large tracts of forest by fire.

<span class="mw-page-title-main">Accipitridae</span> Family of birds of prey

The Accipitridae is one of the three families within the order Accipitriformes, and is a family of small to large birds of prey with strongly hooked bills and variable morphology based on diet. They feed on a range of prey items from insects to medium-sized mammals, with a number feeding on carrion and a few feeding on fruit. The Accipitridae have a cosmopolitan distribution, being found on all the world's continents and a number of oceanic island groups. Some species are migratory. The family contains 255 species which are divided into 70 genera.

<span class="mw-page-title-main">Golden eagle</span> Species of eagle

The golden eagle is a bird of prey living in the Northern Hemisphere. It is the most widely distributed species of eagle. Like all eagles, it belongs to the family Accipitridae. They are one of the best-known birds of prey in the Northern Hemisphere. These birds are dark brown, with lighter golden-brown plumage on their napes. Immature eagles of this species typically have white on the tail and often have white markings on the wings. Golden eagles use their agility and speed combined with powerful feet and large, sharp talons to hunt a variety of prey, mainly hares, rabbits, and marmots and other ground squirrels. Golden eagles maintain home ranges or territories that may be as large as 200 km2 (77 sq mi). They build large nests in cliffs and other high places to which they may return for several breeding years. Most breeding activities take place in the spring; they are monogamous and may remain together for several years or possibly for life. Females lay up to four eggs, and then incubate them for six weeks. Typically, one or two young survive to fledge in about three months. These juvenile golden eagles usually attain full independence in the fall, after which they wander widely until establishing a territory for themselves in four to five years.

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

The osprey, also called sea hawk, river hawk, and fish hawk, is a diurnal, fish-eating bird of prey with a cosmopolitan range. It is a large raptor, reaching more than 60 cm (24 in) in length and 180 cm (71 in) across the wings. It is brown on the upperparts and predominantly greyish on the head and underparts.

<span class="mw-page-title-main">Wedge-tailed eagle</span> Bird of prey within the genus Aquila

The wedge-tailed eagle is the largest bird of prey in the continent of Australia. It is also found in southern New Guinea to the north and is distributed as far south as the state of Tasmania. Adults of the species have long, broad wings, fully feathered legs, an unmistakable wedge-shaped tail, an elongated upper mandible, a strong beak and powerful feet. The wedge-tailed eagle is one of 12 species of large, predominantly dark-coloured booted eagles in the genus Aquila found worldwide. Genetic research has clearly indicated that the wedge-tailed eagle is fairly closely related to other, generally large members of the Aquila genus. A large brown-to-black bird of prey, it has a maximum reported wingspan of 2.84 m and a length of up to 1.06 m.

<span class="mw-page-title-main">White-tailed eagle</span> Species of bird

The white-tailed eagle, sometimes known as the 'sea eagle', is a large bird of prey, widely distributed across temperate Eurasia. Like all eagles, it is a member of the family Accipitridae which includes other diurnal raptors such as hawks, kites, and harriers. One of up to eleven members in the genus Haliaeetus, which are commonly called sea eagles, it is also referred to as the white-tailed sea-eagle. Sometimes, it is known as the ern or erne, gray sea eagle and Eurasian sea eagle.

<span class="mw-page-title-main">White-bellied sea eagle</span> Large diurnal bird of prey

The white-bellied sea eagle, also known as the white-breasted sea eagle, is a large diurnal bird of prey in the family Accipitridae. Originally described by Johann Friedrich Gmelin in 1788, it is closely related to Sanford's sea eagle of the Solomon Islands, and the two are considered a superspecies. A distinctive bird, the adult white-bellied sea eagle has a white head, breast, under-wing coverts and tail. The upper parts are grey and the black under-wing flight feathers contrast with the white coverts. The tail is short and wedge-shaped as in all Haliaeetinae species. Like many raptors, the female is larger than the male, and can measure up to 90 cm (35 in) long with a wingspan of up to 2.2 m (7.2 ft), and weigh 4.5 kg (9.9 lb). Immature birds have brown plumage, which is gradually replaced by white until the age of five or six years. The call is a loud goose-like honking.

<span class="mw-page-title-main">Grey-headed fish eagle</span> Species of bird

The grey-headed fish eagle is a fish-eating bird of prey from South East Asia. It is a large stocky raptor with adults having dark brown upper body, grey head and lighter underbelly and white legs. Juveniles are paler with darker streaking. It is often confused with the lesser fish eagle and the Pallas's fish eagle. The lesser fish eagle is similar in plumage but smaller and the Pallas's fish eagle shares the same habitat and feeding behaviour but is larger with longer wings and darker underparts. Is often called tank eagle in Sri Lanka due to its fondness for irrigation tanks.

<i>Icthyophaga</i> Genus of bird

Icthyophaga or Ichthyophaga is a genus of six species of eagles, closely related to the sea eagles in the genus Haliaeetus. In fact, some taxonomic authorities place this genus within Haliaeetus. Both are native to southeastern Asia, from the Indian subcontinent southeast to Sulawesi. They are smaller than the Haliaeetus eagles, though overlapping in size with the smaller species of that genus. They share similar plumage, with grey heads grading into dull grey-brown wings and bodies, and white belly and legs. They differ in tail colour, with the lesser fish eagle having a brown tail, and the grey-headed fish eagle having a white tail with a black terminal band, and also in size, with the lesser fish eagle only about half of the weight of the grey-headed fish eagle.

<span class="mw-page-title-main">African fish eagle</span> Species of bird

The African fish eagle or the African sea eagle is a large species of eagle found throughout sub-Saharan Africa wherever large bodies of open water with an abundant food supply occur. It is the national bird of Malawi, Namibia, Zambia, and Zimbabwe. As a result of its large range, it is known in many languages. Examples of names include: Vis Arend in Afrikaans, nkwazi in Chewa, aigle pêcheur in French, hungwe in Shona, inkwazi in isiZulu, and ntšhu in Northern Sotho. This species may resemble the bald eagle in appearance; though related, the two species occur on different continents, with the bald eagle being resident in North America.

<span class="mw-page-title-main">Madagascar fish eagle</span> Species of bird

The Madagascar fish eagle or Madagascar sea-eagle, is a large bird of prey in the family Accipitridae which also includes many other diurnal raptors such as kites, buzzards and harriers. It is endemic to the coastal strip in the northwest of Madagascar. It is about 63 cm (25 in) long and has a pale brown head, dark brown body and white tail. The Madagascar fish eagle has been suffering from a declining population and is threatened by habitat destruction and persecution, and the International Union for Conservation of Nature has rated its conservation status as being "critically endangered".

<span class="mw-page-title-main">Steller's sea eagle</span> Bird of prey species native to East Asia

Steller's sea eagle, also known as Pacific sea eagle or white-shouldered eagle, is a very large diurnal bird of prey in the family Accipitridae. It was described first by Peter Simon Pallas in 1811. No subspecies are recognised. A sturdy eagle, it has dark brown plumage with white wings and tail, a yellow beak, and yellow talons. Typically, it is the heaviest eagle in the world, at about 5 to 10 kg, but in some standard measurements, may be ranked below the harpy eagle and the Philippine eagle. Steller's sea eagle females are bigger than males.

<span class="mw-page-title-main">Pallas's fish eagle</span> Species of bird

Pallas's fish eagle, also known as Pallas's sea eagle or band-tailed fish eagle, is a large, brownish sea eagle. It breeds in the east Palearctic in Kazakhstan, Russia, Tajikistan, Turkmenistan, Uzbekistan, Mongolia, China, India, Nepal, Bangladesh, Myanmar and Bhutan. It is listed as Endangered on the IUCN Red List. It is partially migratory, with Central Asian birds wintering among the southern Asian birds in northern India, and also further west to the Persian Gulf.

<span class="mw-page-title-main">Lesser fish eagle</span> Species of bird

The lesser fish eagle is a species of Icthyophaga found in the Indian subcontinent, primarily in the foothills of the Himalayas, and south-east Asia. There are records from Gujarat, Central India and in more recent times from the Kaveri river valley in southern India, although the south Indian records are now thought to come from an isolated population, disjunct from the species' normal range. Some taxonomic authorities place this species in the monotypic genus Icthyophaga. Others place it in the genus Haliaeetus.

Sanford's sea eagle, also known as Sanford's fish eagle or the Solomon eagle, is a sea eagle endemic to the Solomon Islands archipelago.

<span class="mw-page-title-main">Gurney's eagle</span> Species of bird

Gurney's eagle is a large eagle in the family Accipitridae. It is found in New Guinea and Wallacea, and is an occasional vagrant to Australia.

<span class="mw-page-title-main">Eastern osprey</span> Subspecies of bird

The eastern osprey is a diurnal, fish-eating bird of prey. They live in Oceania at coastal regions of the Australian continent, the Indonesian islands, New Guinea, and the Philippines. It is usually sedentary and pairs breed at the same nest site, building up a substantial structure on dead trees or limbs. The subspecies resides in a habitat close to coasts and estuaries that provide opportunities for fishing. In 2022, it was considered a defunct species by the IOC, due to its low genetic divergences and absence in morphological differences. The eastern osprey's diet consists mostly of vertebrate fish species. It possesses specialised physical characteristics and exhibits unique behaviour to assist in hunting and catching prey.

References

  1. "Mindat.org". www.mindat.org. Retrieved 2021-05-28.
  2. Etymology: Neo-Latin "sea eagle", from Ancient Greek Archived 2021-12-08 at the Wayback Machine ἁλιάετος (haliaetos) or ἁλιαίετος (haliaietos, poetic (e.g. Homeric) variant), "sea eagle, osprey" (hali, "at sea" (dative case), + aetos, "eagle"). The two variant Greek forms lie behind the equally correct latinizations haliaetus (as in Pandion haliaetus ) and haliaeetus.
  3. 1 2 3 Lerner, Heather R.L.; Mindell, David P. (2005). "Phylogeny of eagles, Old World vultures, and other Accipitridae based on nuclear and mitochondrial DNA" (PDF). Molecular Phylogenetics and Evolution. 37 (2): 327–46. doi:10.1016/j.ympev.2005.04.010. PMID   15925523.
  4. Savigny, Marie Jules César (1809). Description de l'Égypte: Histoire naturelle Volume 1 (in French). Paris: Imprimerie impériale. pp.  68, 85.
  5. Mayr, Ernst; Cottrell, G. William, eds. (1979). Check-list of Birds of the World. Volume 1. Vol. 1 (2nd ed.). Cambridge, Massachusetts: Museum of Comparative Zoology. p. 299.
  6. 1 2 3 4 5 del Hoyo, Elliott & Sargatal 1994.
  7. Brown, L. H, & Amadon, D. (1968). Eagles, Hawks and Falcons of the World. Country Life Books, Feltham.
  8. 1 2 3 4 Wink, Heidrich & Fentzloff 1996.
  9. LM2005.pdf
  10. Rasmussen, D., Tab, O., Storrs, L., & Simons, E. L. (1987). Fossil Birds from the Oligocene Jebel Qatrani Formation, Fayum Province, Egypt. Smithsonian Contributions to Paleobiology 62: 1–20. PDF Fulltext (file size 8.1 MB)
  11. Lambrecht, K. (1933). Handbuch der Palaeornithologie. Gebrüder Bornträger, Berlin.
  12. AFP (5 April 2011). "Eagle cam becomes net sensation". Sydney Morning Herald. Retrieved 5 April 2011.
  13. "Sea-Eagle CAM". Sea Eagle Cam, BirdLife Australia. Retrieved 7 September 2020.

General sources