Calayan rail

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Calayan rail
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Gruiformes
Family: Rallidae
Genus: Aptenorallus
Kirchman, McInerney, Giarla, Olson, Slikas & Fleischer, 2021
Species:
A. calayanensis
Binomial name
Aptenorallus calayanensis
(Allen, D, Oliveros, Española, Broad & Gonzalez, 2004)
Synonyms

Gallirallus calayanensisAllen, D., Oliveros, Española, Broad & Gonzalez, 2004

Contents

The Calayan rail (Aptenorallus calayanensis) is a flightless bird of the rail, moorhen, and coot family (Rallidae) that inhabits Calayan Island in the Philippines. It is the only member of the genus Aptenorallus. Though well known to natives of the island as the "piding", it was first observed by ornithologist Carmela Española in May 2004 and the discovery was officially announced on August 16, 2004.

Description

The Calayan rail is a relatively large flightless rail. Its plumage is dark grayish overall, with a blacker face and slightly browner upperparts. The bill and legs are bright orange-red, unique among similar-sized dark-colored ground-dwelling birds on Calayan. Its vocalizations are loud, harsh, and nasal-sounding. [2]

Taxonomy

It was initially discovered by Carmela Espanola during fieldworlk in the area. The formal description as a species new to science appeared in the journal Forktail (Allen et al. 2004).

Prior to 2022, it was classified in the genus Gallirallus. Following studies in 2012 and 2013, all recent species in the genus Gallirallus aside from the Calayan rail and the weka of New Zealand were moved to the genus Hypotaenidia . Following this, the Calayan rail and the weka were considered the two extant species of the genus Gallirallus. However, a 2021 phylogenetic study found the Calayan rail to be basal to the species classified in Habroptila , Eulabeornis , Gallirallus, and Hypotaenidia, and thus classified it into its own genus, Aptenorallus. [3] This was accepted by the International Ornithological Congress in 2022. [4]

Behaviour and ecology

Stomach contents of a specimen contained various insects including snails, beetles and millipedes. This bird forages by pecking and turning over dead leaves. This species has weak wings and can barely fly. It is often observed alone or in small groups. [5]

Habitat and conservation status

It is found on the primary and secondary forest on coralline limestone areas on Calayan. [6]

IUCN has assessed this bird as vulnerable with an estimated population of just 2,500 to 4,300 mature individuals. It was initially estimated by biologists in 2004 that there were just 200 pairs on the island. It has since been found to be locally common, with an estimated area of occupancy of 36 km2. However recent species distribution modelling estimated its area of occupancy at 90.2 km2 .

The species' main threat is habitat loss with the clearance of forest habitats as a result of logging and agricultural conversion within its range. It is also occasionally caught in snares meant for red junglefowl. It is also threatened by introduced species such as cats, dogs and rats which could prey on these birds and their nests.

The Calayan municipal council has passed Municipal Ordinance No. 84, which prohibits the capture, sale, possession and collection of the species. There are currently many awareness campaigns using this rail as a flagship species. The municipality of Calayan has passed an ordinance establishing the Calayan Wildlife Sanctuary which covers 29km2 of the island interior.

Conservation actions proposed include more research is needed to clarify the habitat requirements, range size and population size of the species. Promote the establishment of an environmental monitoring system. Conduct further community consultations and education campaigns. Set up a volunteer network for conservation activities. Develop capacity of local officials and community leaders in managing the recently established wildlife sanctuary and in enforcing its rules and regulations. [7]

Related Research Articles

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

Rails are a large, cosmopolitan family of small- to medium-sized terrestrial and/or semi-amphibious birds. The family exhibits considerable diversity in its forms, and includes such ubiquitous species as the crakes, coots, and gallinule; other rail species are extremely rare or endangered. Many are associated with wetland habitats, some being semi-aquatic like waterfowl, but many more are wading birds or shorebirds. The ideal rail habitats are marsh areas, including rice paddies, and flooded fields or open forest. They are especially fond of dense vegetation for nesting. The rail family is found in every terrestrial habitat with the exception of dry desert, polar or freezing regions, and alpine areas. Members of Rallidae occur on every continent except Antarctica. Numerous unique island species are known.

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

The weka, also known as the Māori hen or woodhen is a flightless bird species of the rail family. It is endemic to New Zealand. Some authorities consider it as the only extant member of the genus Gallirallus. Four subspecies are recognized but only two (northern/southern) are supported by genetic evidence.

<span class="mw-page-title-main">Calayan Island</span> Island in the Philippines

Calayan Island is located about 24 miles west-southwest of Babuyan Island off the north coast of the Philippines and belongs to the Babuyan Islands group in the Luzon Strait. The island is hemmed between Aparri and Batanes islands and it is larger than the Fuga Island, which is 25 miles (40 km) away. Calayan is home to the Calayan rail, a flightless bird identified as a separate species in 2004 and endemic to Calayan Island. The island is part of the Municipality of Calayan.

<span class="mw-page-title-main">Lord Howe woodhen</span> Species of bird

The Lord Howe woodhen also known as the Lord Howe Island woodhen or Lord Howe (Island) rail, is a flightless bird of the rail family, (Rallidae). It is endemic to Lord Howe Island off the Australian coast. It is currently classified as endangered by the IUCN.

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

The extinct Wake Island rail was a flightless rail and the only native land bird on the Pacific atoll of Wake. It was found on the islands of Wake and Wilkes, and Peale, which is separated from the others by a channel of about 100 meters. It was hunted to extinction during World War II.

<i>Gallirallus</i> Genus of birds

Gallirallus is a genus of rails that live in the Australasian-Pacific region. The genus is characterised by an ability to colonise relatively small and isolated islands and thereafter to evolve flightless forms, many of which became extinct following Polynesian settlement.

<span class="mw-page-title-main">New Caledonian rail</span> Species of bird

The New Caledonian rail is a large and drab flightless rail endemic to the island of New Caledonia in the Pacific. It is Critically Endangered, may have gone extinct many decades ago already, and if it still exists it is one of the least-known living bird species.

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

The Tahiti rail, Tahitian red-billed rail, or Pacific red-billed rail is an extinct species of rail that lived on Tahiti. It was first recorded during James Cook's second voyage around the world (1772–1775), on which it was illustrated by Georg Forster and described by Johann Reinhold Forster. No specimens have been preserved. As well as the documentation by the Forsters, there have been claims that the bird also existed on the nearby island of Mehetia. The Tahiti rail appears to have been closely related to, and perhaps derived from, the buff-banded rail, and has also been historically confused with the Tongan subspecies of that bird.

<span class="mw-page-title-main">Buff-banded rail</span> Species of bird

The buff-banded rail is a distinctively coloured, highly dispersive, medium-sized rail of the rail family, Rallidae. This species comprises several subspecies found throughout much of Australasia and the south-west Pacific region, including the Philippines, New Guinea, Australia, New Zealand, and numerous smaller islands, covering a range of latitudes from the tropics to the subantarctic.

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

The Saint Helena rail was a large flightless rail from Saint Helena. It became extinct in the early 16th century.

<span class="mw-page-title-main">Invisible rail</span> Large flightless bird endemic to Indonesia

The invisible rail, Wallace's rail, or drummer rail is a large flightless rail that is endemic to the island of Halmahera in Northern Maluku, Indonesia, where it inhabits impenetrable sago swamps adjacent to forests. Its plumage is predominantly dark slate-grey, and the bare skin around its eyes, the long, thick bill, and the legs are all bright red. Its call is a low drumming sound which is accompanied by wing-beating. The difficulty of seeing this shy bird in its dense habitat means that information on its behaviour is limited.

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

The snoring rail, also known as the Celebes rail or Platen's rail, is a large flightless rail and the only member of the genus Aramidopsis. The species is endemic to Indonesia, and it is found exclusively in dense vegetation in wet areas of Sulawesi and nearby Buton. The rail has grey underparts, a white chin, brown wings and a rufous patch on the hind-neck. The sexes are similar, but the female has a brighter neck patch and a differently coloured bill and iris. The typical call is the snoring: ee-orrrr sound that gives the bird its English name.

<span class="mw-page-title-main">Streak-breasted bulbul</span> Species of bird

The streak-breasted bulbul is a songbird species in the bulbul family, Pycnonotidae.

<i>Cabalus</i> Genus of birds

Cabalus is a disputed Oceanian genus of birds in the family Rallidae. Both species placed in the genus here were previously considered part of the genus Gallirallus, one was alternatively placed in Tricholimnas alone or together with the Lord Howe woodhen, and the other was initially included in Rallus.

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

Dieffenbach's rail, known in the Moriori language as meriki or mehoriki, is an extinct flightless species of bird from the family Rallidae. It was endemic to the Chatham Islands.

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

The Okinawa rail is a species of bird in the rail family, Rallidae. It is endemic to Okinawa Island in Japan where it is known as the Yanbaru kuina. Its existence was only confirmed in 1978 and it was formally described in 1981 although unidentified rails had been recorded on the island since at least 1973 and local stories of a bird known as the agachi kumira may refer to this species.

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

Sharpe's rail is a species of bird in the family Rallidae. It is known only from the type specimen of unknown origin, but it has been speculated that it originated from Indonesia. Due to the lack of recent records, it has been considered extinct, but new evidence suggests it is possibly better regarded as a morph of the buff-banded rail.

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

The barred rail is a species of rail found across the Philippines, Sulawesi (Indonesia) and Salawati. The species is common, but shy and difficult to see.

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

The great Oʻahu rail or great Oʻahu crake is a little-known extinct bird species from Oʻahu, Hawaiʻi, attested only by a few subfossil bones. The holotype is a right tarsometatarsus found in a flooded sinkhole on the ʻEwa Plain near Barbers Point, the southwestern tip of Oʻahu.

<i>Hypotaenidia</i> Genus of birds

Hypotaenidia is a genus of birds in the family Rallidae. The genus is considered separate by the IOC and IUCN, while The Clements Checklist of Birds of the World / eBird consider the species to be part of Gallirallus. Since the mid-19th century, when these rather terrestrial birds were recognized to form a genus distinct from the decidedly aquatic Rallus, the validity of Hypotaenidia has been disputed.

References

  1. BirdLife International (2016). "Gallirallus calayanensis". IUCN Red List of Threatened Species . 2016: e.T22732059A95041689. doi: 10.2305/IUCN.UK.2016-3.RLTS.T22732059A95041689.en . Retrieved 12 November 2021.
  2. "Calayan Rail". eBird. Archived from the original on 2019-05-02.
  3. Kirchman, Jeremy J.; McInerney, Nancy Rotzel; Giarla, Thomas C.; Olson, Storrs L.; Slikas, Elizabeth; Fleischer, Robert C. (16 July 2021). "Phylogeny based on ultra-conserved elements clarifies the evolution of rails and allies (Ralloidea) and is the basis for a revised classification". Ornithology . 138 (4): 1–21. doi:10.1093/ornithology/ukab042. ISSN   0004-8038.
  4. "Finfoots, flufftails, rails, trumpeters, cranes, Limpkin – IOC World Bird List" . Retrieved 2022-08-24.
  5. Fjeldså, Jon; de Juana, Eduardo (2020). "Calayan Rail (Gallirallus calayanensis), version 1.0". Birds of the World. doi:10.2173/bow.calrai1.01species_shared.bow.project_name. ISSN   2771-3105.
  6. Allen, Desmond (2020). Birds of the Philippines. Barcelona: Lynx and Birdlife International Fiedlguides. pp. 94–95.
  7. International), BirdLife International (BirdLife (2016-10-01). "IUCN Red List of Threatened Species: Gallirallus calayanensis". IUCN Red List of Threatened Species. Retrieved 2021-09-16.