Hellenica World

Haliaeetus sanfordi

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Classis: Aves
Subclassis: Carinatae
Infraclassis: Neornithes
Parvclassis: Neognathae
Ordo: Falconiformes
Familia: Accipitridae
Subfamilia: Haliaeetinae
Genus: Haliaeetus
Species: Haliaeetus sanfordi

Name

Haliaeetus sanfordi Mayr, 1935

Vernacular names
Česky: Orel Sanfordův
English: Sanford's Sea-Eagle, Sanford's Fish-Eagle
Español: Pigargo de Sanford
Polski: Bielik melanezyjski

Reference

American Museum Novitates no.820 p.1

The Sanford's Sea-eagle (Haliaeetus sanfordi), sometimes listed as Sanford's Fish-eagle or Solomon Eagle, is a sea-eagle endemic to the Solomon Islands. The "sea-eagle" name is to be preferred, to distinguish the species of Haliaeetus from the closely related Ichthyophaga true fish eagles.[1]

Description

The Sanford's Sea-eagle was discovered by and named after Dr Leonard C. Sanford, a trustee for the American Museum of Natural History. The first description was by Ernst Mayr in 1935. It can reach a length between 70 and 90 cm (28-36 in) and a weight between 1.5 and 2.7 kg (3.3-6 lbs). The wingspan is between 165 and 185 cm. It is the only large predator on the Solomon Islands. The eagles inhabits coastal forests and lakes up to an altitude of about 1500 m asl.[1]

The plumage is whitish brown to bright brown on the head and the neck. The underparts are brown to reddish brown and dark brown. The upperparts are darkish brown to gray-black. The eyes are bright brown. Uniquely among sea-eagles, this species has an entirely dark tail throughout its life.

The breeding season is from August to October. The nest consists of two eggs.

The diet consists of mainly of tideline carrion, fish, molluscs, crabs, tortoises, and sea snakes, and more rarely birds and fruit-bats snatched from the rain-forest canopy.[1] It has also been reported to feed opportunistically on the Northern Common Cuscus.[2]

It forms a superspecies with the White-bellied Sea-eagle. As in other sea-eagle species pairs, the other taxon is white-headed. These two are genetically very close, it seems; their lineages separated not longer ago than 1 mya, probably only in the Middle Pleistocene, a few 100,000 years ago (Wink et al., 1996[3]). Both share a dark bill, talons, and eyes with the other Gondwanan sea-eagles.

This eagle is often illustrated on postage stamps of the Solomon Islands.

References

* BirdLife International (2004). Haliaeetus sanfordi. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 06 May 2006. Database entry includes justification for why this species is vulnerable
* Birdlife factsheet
* Wink, M.; Heidrich, P. & Fentzloff, C. (1996): A mtDNA phylogeny of sea eagles (genus Haliaeetus) based on nucleotide sequences of the cytochrome b gene. Biochemical Systematics and Ecology 24: 783-791. doi:10.1016/S0305-1978(96)00049-X PDF fulltext


Footnotes

1. ^ a b c del Hoyo, J., Elliott, A., & Sargatal, J., eds. (1994). Handbook of the Birds of the World Vol. 2. Lynx Edicions, Barcelona ISBN 84-87334-15-6.
2. ^ Heinsohn, Tom (2000). "Predation by the White-breasted Sea Eagle Haliaeetus leucogaster on Phalangerid Possums in New Ireland, Papua New Guinea". Emu 100 (3): 245–246. doi:10.1071/MU00913.
3. ^ Note that the author's reservation about the high rate of molecular evolution have proven well justified; the 2% per 4 million years seem if anything an overestimate. In addition, as the provenance of specimens is not noted, genetic introgression due to hybridzation cannot be excluded, as the species' ranges touch. This is unlikely due to marked differences in behavior and habitat preferences however.

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