Gough moorhen

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Gough moorhen
Gallinula nesiotis Beintema.jpg
on Tristan da Cunha
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Gruiformes
Family: Rallidae
Genus: Gallinula
Species:
G. comeri
Binomial name
Gallinula comeri
(Allen, 1892)

The Gough moorhen (Gallinula comeri) is a medium-sized, almost flightless bird that is similar to the common moorhen (Gallinula chloropus), but is smaller, stockier, and has shorter wings. The bird has a distinctive yellow-tipped red bill and red frontal shield. Its first account was written in 1888 by the polar explorer George Comer, [2] whom the specific name comeri commemorates. [3] This bird is found only on two remote islands in the South Atlantic.

The Gough moorhen was originally endemic to Gough Island, but in 1956 was introduced to Tristan da Cunha, an island in the same archipelago which was formerly home of the now extinct Tristan moorhen (Galinula nesiotis). On the basis of DNA sequencing of both recently collected and historical material from both of the archipelago's moorhen species, Groenenberg et al (2008) concluded that the genetic distances between G. nesiotis and G. comeri are of at least the same size as those found between subspecies of common moorhen (G. chloropus) in the literature. They propose that the extinct moorhen of Tristan (G. nesiotis) and the moorhens that live on Gough and Tristan today (G. comeri) be regarded as subspecies. [4]

On Gough Island, it appears that the bird's future is secure with the island being a nature reserve and a World Heritage Site. In the mid-1990s, it was estimated that 2,500 breeding pairs existed on Gough Island. Gough Island is considered the least disturbed, major, cool-temperate island ecosystem in the South Atlantic Ocean and hosts one of the most important sea-bird colonies in the world, containing 54 bird species, 22 breeding species, and four threatened species. However, on Tristan da Cunha, it is not classified as a native species and therefore is not protected.

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Gough Island, also known historically as Gonçalo Álvares, is a rugged volcanic island in the South Atlantic Ocean. It is a dependency of Tristan da Cunha and part of the British overseas territory of Saint Helena, Ascension and Tristan da Cunha. It is about 400 km (250 mi) south-east of the Tristan da Cunha archipelago, 2,400 km (1,500 mi) north-east from South Georgia Island, 2,700 km (1,700 mi) west from Cape Town, and over 3,200 km (2,000 mi) from the nearest point of South America.

Inaccessible Island Island in Tristan da Cunha archipelago

Inaccessible Island is an extinct volcano, last active six million years ago, with Cairn Peak reaching 449 m (1,473 ft). The island is 12.65 km2 (4.88 sq mi) in area, rising out of the South Atlantic Ocean 31 km (19 mi) south-west of Tristan da Cunha.

Spectacled petrel Species of bird

The spectacled petrel is a rare seabird that nests only on the high western plateau of Inaccessible Island in the South Atlantic Tristan da Cunha group. It is one of the largest petrels that nests in burrows. This species was formerly considered to be a subspecies of the white-chinned petrel.

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Saint Helena, Ascension Island and Tristan da Cunha, as well the other uninhabited islands nearby, are a haven for wildlife in the middle of the Atlantic Ocean. The islands are or were home to much endemic flora and fauna, especially invertebrates, and many endemic fish species found in the reef ecosystems off the islands. The islands have been identified by BirdLife International as Important Bird Areas for both their endemic landbirds and breeding seabirds.

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Geography of Tristan da Cunha

Tristan da Cunha is an archipelago of five islands in the southern Atlantic Ocean, the largest of which is the island of Tristan da Cunha itself and the second-largest, the remote bird haven, Gough Island. It forms part of a wider territory called Saint Helena, Ascension and Tristan da Cunha which includes Saint Helena and Ascension Island.

<span class="mw-page-title-main">Sandy Point, Tristan da Cunha</span> Easternmost extremity of the island of Tristan da Cunha

Sandy Point is the easternmost extremity of the island of Tristan da Cunha in the South Atlantic Ocean. It is a distance of about 7 miles (12 km) by sea from the island's only settlement, Edinburgh of the Seven Seas. There is a beach of black volcanic sand fringed by low cliffs and a sloping plateau leading up to Tristan's mountainous interior. Its climate is warmer and drier than that of the Settlement, being in the lee of the island's prevailing winds.

Tristan da Cunha–Gough Islands shrub and grasslands

The Tristan da Cunha–Gough Islands shrub and grasslands is a terrestrial ecoregion which covers the Tristan da Cunha archipelago and Gough Island in the South Atlantic Ocean. The islands' remote location gave rise to many endemic species.

References

  1. BirdLife International (2016). "Gallinula comeri". IUCN Red List of Threatened Species . 2016: e.T22692866A93372513. doi: 10.2305/IUCN.UK.2016-3.RLTS.T22692866A93372513.en . Retrieved 12 November 2021.
  2. Roots, Clive (2006). Flightless birds. Westport, Conn.: Greenwood Press. p. 60. ISBN   0-313-33545-1 . Retrieved 31 March 2008.
  3. Beolens, Bo; Watkins, Michael; Grayson, Michael (28 August 2014). The Eponym Dictionary of Birds. Bloomsbury Publishing. p. 284. ISBN   978-1-4729-0574-1.
  4. Groenenberg, D.S.J., Beintema, A,J., Dekker, R.W.R.J. & E. Gittenberger, 2008. Ancient DNA Elucidates the Controversy about the Flightless Island Hens (Gallinula sp.) of Tristan da Cunha. PLoS ONE 3(3):1835. full text