Tooth-billed pigeon

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Tooth-billed pigeon
Naturalis Biodiversity Center - ZMA.AVES.56900 - Didunculus strigirostris Jardine, 1845 - Columbidae - skin specimen.jpeg
Mounted specimen at the Naturalis Biodiversity Center
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Columbiformes
Family: Columbidae
Genus: Didunculus
Species:
D. strigirostris
Binomial name
Didunculus strigirostris
(Jardine, 1845)

The tooth-billed pigeon (Didunculus strigirostris), also known as the manumea, is a large pigeon found only in Samoa. It is the only living species of genus Didunculus . A related extinct species, the Tongan tooth-billed pigeon (Didunculus placopedetes), is only known from subfossil remains in several archeological sites in Tonga. [2] [3] The tooth-billed pigeon is the national bird of Samoa and featured on the 20 tālā bills and the 50 sene pieces of the 2008/2011 series. Native only to Samoa's primary rainforest, it is considered to be endangered, with only a few hundred individuals thought to remain in existence.

Contents

Description

Illustration by John Gould (probably from stuffed specimens) Tooth-billed Pigeon.jpg
Illustration by John Gould (probably from stuffed specimens)
Illustration in habitat by Gustav Mutzel Didunculus strigirostris.jpg
Illustration in habitat by Gustav Mützel

The tooth-billed pigeon is a medium-sized, approximately 31 cm long, dark pigeon with reddish feet and red bare skin around the eye. The underparts, head and neck are greyish with a slight blue-green iridescence, and the tail, wings-coverts and tertials are rufous chestnut, while the remaining remiges are blackish. It has a large, curved, and hooked bright red bill, with tooth-like projections on the lower mandible which let them act as seed dispensers. [4] The sexes are similar in appearance, but the juvenile is duller, with a browner head, and a black bill with pale orange at the base. [5] Behaviourally, it is unusual – perhaps unique – among members of Columbiformes in drinking by scooping water up in its bill, in the manner of the great majority of bird species, rather than sucking it up using the tongue as a straw. [6]

Taxonomy and systematics

The species was probably found in October or November 1839, by the United States' Exploring Expedition under Commander Wilkes. The discovery of the bird was announced by Hugh Edwin Strickland in September 1844 as being among the rarities obtained by Mr. Titian Peale, the naturalist of the expedition. The formal description was made by William Jardine (Ann. Nat. Hist. xvi. p. 175, plate 9), under the name of Gnathodon strigirostris, although that genus name was already in use for a mollusc. [7]

It has no close living relative, but it has been shown to be genetically close to the dodo, [8] and the genus name Didunculus means "little dodo". [9] the English name of dodlet was suggested by Sir Richard Owen. The jaw and tongue structure, and the superficially parrotlike bill have suggested a relationship to the parrots, but these features have arisen from its specialised diet rather than any real relationship.

The following cladogram, from Shapiro and colleagues (2002), shows the tooth-billed pigeon as the basal member of the clade and closest relationships within Columbidae, a clade consisting of generally ground-dwelling island endemics of which the Dodo is the most prominent. [8]

Didunculus strigirostris (tooth-billed pigeon)

Goura victoria (Victoria crowned pigeon)

Caloenas nicobarica (Nicobar pigeon)

Pezophaps solitaria (Rodrigues solitaire)

Raphus cucullatus (dodo)

A similar cladogram was published in 2007, differing only in the inverted placement of Goura and Didunculus, as well as in the inclusion of the pheasant pigeon and the thick-billed ground pigeon at the base of the clade. [10]

Distribution and habitat

The tooth-billed pigeon is confined to undisturbed forests of Samoa in the Pacific. Natural habitats for the tooth-billed pigeon in Samoa include the Central Savai'i Rainforest, Tafua Preserve, Fagaloa Bay – Uafato Tiavea Conservation Zone on Upolu Island, and Nu'ulua island. Little is known about the ecology and biology of the species but it is believed to feed on the fruits of Dysoxylum , a tree in the mahogany family. Manuscripts from the 1800s suggest chicks are confined to the forest floor. However the location of nests (in a tree or on the ground) is still unconfirmed.

Status

Live specimen, 1901 Didunculus.jpg
Live specimen, 1901

Because of ongoing habitat loss, limited range, small population size, hunting and occasional cyclones as well as the likely impact of introduced species such as pigs, dogs, rats and cats, the tooth-billed pigeon is evaluated as critically endangered on the IUCN Red List of Threatened Species. Surveys suggest numbers are critical and that 70 to 380 individuals survive in the wild, and there is currently no captive population. [11] No juveniles had been sighted during any recent surveys until the 2013 sighting of a single juvenile in the lowlands of Savaii during a survey of the Samoan Ministry of Natural Resources and the Environment. [1] It is highly likely that chick mortality is high and the observed population are an aged population of adult birds. Actions to save this species will likely require conservation education to reduce hunting risk, and knowledge of the biology of the population and the reasons behind the current decline. Population control for rats and cats is likely to be critical, as is continuing deforestation and disappearance of old-growth forests. [1]

In 2020 the bird was both heard and seen during a survey of forests on Savai'i. [12]

Related Research Articles

<span class="mw-page-title-main">Dodo</span> Extinct species of bird

The dodo is an extinct flightless bird that was endemic to the island of Mauritius, which is east of Madagascar in the Indian Ocean. The dodo's closest relative was the also-extinct and flightless Rodrigues solitaire. The two formed the subfamily Raphinae, a clade of extinct flightless birds that were a part of the family which includes pigeons and doves. The closest living relative of the dodo is the Nicobar pigeon. A white dodo was once thought to have existed on the nearby island of Réunion, but it is now believed that this assumption was merely confusion based on the also-extinct Réunion ibis and paintings of white dodos.

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

Columbidae is a bird family consisting of doves and pigeons. It is the only family in the order Columbiformes. These are stout-bodied birds with short necks and short slender bills that in some species feature fleshy ceres. They primarily feed on plants, and can be taxonomically divided amongst granivores, that feed mostly on the ground on seeds, and frugivores, that feed mostly on fruits, from branches. The family occurs worldwide, often in close proximity with humans, but the greatest variety is in the Indomalayan and Australasian realms.

<span class="mw-page-title-main">Rodrigues solitaire</span> Extinct, flightless bird that was endemic to Rodrigues

The Rodrigues solitaire is an extinct flightless bird that was endemic to the island of Rodrigues, east of Madagascar in the Indian Ocean. Genetically within the family of pigeons and doves, it was most closely related to the also extinct dodo of the nearby island Mauritius, the two forming the subfamily Raphinae. The Nicobar pigeon is their closest living genetic relative.

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

The Nicobar pigeon or Nicobar dove is a bird found on small islands and in coastal regions from the Andaman and Nicobar Islands, India, east through the Indonesian Archipelago, to the Solomons and Palau. It is the only living member of the genus Caloenas alongside the extinct spotted green pigeon and Kanaka pigeon, and is the closest living relative of the extinct dodo and Rodrigues solitaire.

<span class="mw-page-title-main">Raphina</span> Extinct subtribe of birds

The Raphina are a clade of extinct flightless birds formerly called didines or didine birds. They inhabited the Mascarene Islands of Mauritius and Rodrigues, but became extinct through hunting by humans and predation by introduced non-native mammals following human colonisation in the 17th century. Historically, many different groups have been named for both the dodo and the Rodrigues solitaire, not all grouping them together. Most recently, it is considered that the two birds can be classified in Columbidae, often under the subfamily Raphinae. The first person to suggest a close affinity to the doves was Johannes Theodor Reinhardt, whose opinions were then supported by Hugh Edwin Strickland and Alexander Gordon Melville.

<span class="mw-page-title-main">Choiseul pigeon</span> An extinct bird from the Solomon Islands

The Choiseul pigeon is an extinct species of bird in the pigeon and dove family, Columbidae. It was endemic to the island of Choiseul in the Solomon Islands, although there are unsubstantiated reports that it may once have lived on several nearby islands. The last confirmed sighting was in 1904. Other common names were Solomons crested pigeon, Solomon Islands crowned-pigeon and Kuvojo.

<span class="mw-page-title-main">Mauritius blue pigeon</span> Extinct bird in the family Columbidae from Mauritius

The Mauritius blue pigeon is an extinct species of blue pigeon formerly endemic to the Mascarene island of Mauritius in the Indian Ocean east of Madagascar. It has two extinct relatives from the Mascarenes and three extant ones from other islands. It is the type species of the genus of blue pigeons, Alectroenas. It had white hackles around the head, neck and breast and blue plumage on the body, and it was red on the tail and the bare parts of the head. These colours were thought similar to those of the Dutch flag, a resemblance reflected in its French common name, Pigeon Hollandais. The juveniles may have been partially green. It was 30 cm (12 in) long and larger and more robust than any other blue pigeon species. It fed on fruits, nuts, and molluscs, and was once widespread in the forests of Mauritius.

Tafua is a seaside village on the island of Savai'i in Samoa. It is situated on a peninsula on the southeast coast of the island in Palauli district. The population is 406.

<span class="mw-page-title-main">Uafato</span> Village & Conservation Area in Vaa-o-Fonoti, Samoa

Uafato is a village on the north east coast of Upolu island in Samoa within the political district of Va'a-o-Fonoti. It has a population of 254. The village is part of a conservation zone called the Uafato Conservation Area with national and global significance as a unique cultural and conservation area.

<i>Didunculus</i> Genus of birds

The tooth-billed pigeons are the only genus (Didunculus) of the subfamily Didunculinae, in the pigeon and dove family, (Columbidae). It has no close living relatives, but it has been shown to be genetically close to the dodo, and the genus name Didunculus means "little dodo". The jaw and tongue structure, and the superficially parrotlike bill have suggested a relationship to the parrots, but these features have arisen from its specialised diet rather than any real relationship.

<span class="mw-page-title-main">Blue pigeon</span> Genus of birds

The blue pigeons are a genus, Alectroenas, of birds in the dove and pigeon family Columbidae. They are native to islands in the western Indian Ocean.

<span class="mw-page-title-main">Mao (bird)</span> Species of birds

The mao or ma'oma'o is a passerine bird belonging to the genus Gymnomyza in the honeyeater family Meliphagidae. It is an endangered species and is endemic to the Samoan Islands.

<span class="mw-page-title-main">Bird extinction</span> Typically human-caused eradication of entire avian species

Bird extinction is the complete elimination of all species members under the taxonomic class, Aves. Out of all known bird species,, 159 (1.4%) have become extinct, with 226 (2%) being critically endangered. There is a general consensus among ornithologists that if anthropogenic activities continue as current trends suggest, one-third of all bird species, and an even greater proportion of bird populations, will be rendered extinct by the end of the 21st century.

<span class="mw-page-title-main">Spotted green pigeon</span> Extinct species of bird

The spotted green pigeon or Liverpool pigeon is a species of pigeon which is most likely extinct. It was first mentioned and described in 1783 by John Latham, who had seen two specimens of unknown provenance and a drawing depicting the bird. The taxonomic relationships of the bird were long obscure, and early writers suggested many different possibilities, though the idea that it was related to the Nicobar pigeon prevailed, and it was therefore placed in the same genus, Caloenas. Today, the species is only known from a specimen kept in World Museum, Liverpool. Overlooked for much of the 20th century, it was recognised as a valid extinct species by the IUCN Red List only in 2008. It may have been native to an island somewhere in the South Pacific Ocean or the Indian Ocean, and it has been suggested that a bird referred to as titi by Tahitian islanders was this bird. In 2014, a genetic study confirmed it as a distinct species related to the Nicobar pigeon, and showed that the two were the closest relatives of the extinct dodo and Rodrigues solitaire.

<span class="mw-page-title-main">Nuʻulua</span> Island in Atua District, Samoa

Nuʻulua is an island in Samoa. It is located in the Aleipata Islands, somewhat more than 1.3 km from the eastern end of Upolu.

<span class="mw-page-title-main">Samoan tropical moist forests</span> Tropical moist broadleaf forests ecoregion of the Samoan Islands

The Samoan tropical moist forests are a tropical moist broadleaf forest ecoregion in the Samoan Islands of the Pacific Ocean.

<span class="mw-page-title-main">Mascarene grey parakeet</span> Extinct parrot from Mauritius and Réunion

The Mascarene grey parakeet, Mauritius grey parrot, or Thirioux's grey parrot, is an extinct species of parrot which was endemic to the Mascarene Islands of Mauritius and Réunion in the western Indian Ocean. It has been classified as a member of the tribe Psittaculini, along with other parrots from the Islands.

The Samoa Conservation Society is an environmental organisation based in Samoa. Its purpose is to promote the conservation of Samoa’s biological diversity and natural heritage. The society is active in efforts to save the critically-endangered Manumea, Samoa's national bird, and in forest restoration.

<span class="mw-page-title-main">Tongan tooth-billed pigeon</span> Extinct species of bird

The Tongan tooth-billed pigeon, is an extinct species of pigeon that was endemic to Tonga that lived in the Quaternary period. A related species, the tooth-billed pigeon, is the only known living species in its genus.

References

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  7. Newton, Alfred (1893–1896). A Dictionary of Birds. London: Adam & Charles Black. p.  154.
  8. 1 2 Shapiro, B.; Sibthorpe, D.; Rambaut, A.; Austin, J.; Wragg, G. M.; Bininda-Emonds, O. R. P.; Lee, P. L. M.; Cooper, A. (2002). "Flight of the Dodo" (PDF). Science. 295 (5560): 1683. doi:10.1126/science.295.5560.1683. PMID   11872833. Supplementary information
  9. Rauzon, Mark J. (2007). "Island restoration: Exploring the past, anticipating the future" (PDF). Marine Ornithology. 35 (2): 97–107.
  10. Pereira, S. L.; Johnson, K. P.; Clayton, D. H.; Baker, A. J. (2007). "Mitochondrial and nuclear DNA sequences support a Cretaceous origin of Columbiformes and a dispersal-driven radiation in the Paleogene". Systematic Biology. 56 (4): 656–672. doi: 10.1080/10635150701549672 . PMID   17661233.
  11. Extinction warning: racing to save the little dodo from its cousin's fate
  12. Sapeer Mayron (25 August 2020). "Near-extinct manumea spotted in Savai'i". Samoa Observer. Retrieved 5 August 2021.