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. The formal description as a species new to science appeared in the journal Forktail (Allen et al. 2004).

Taxonomy

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. [2] This was accepted by the International Ornithological Congress in 2022. [3]

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. [4]

Habitat and conservation status

It is found on the primary and secondary forest on coralline limestone areas on Calayan. [5]

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. [6]

Related Research Articles

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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. It is 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">Tahiti rail</span> Extinct species of bird from Tahiti

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

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<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

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

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<span class="mw-page-title-main">Blue-backed parrot</span> Species of bird

The blue-backed parrot, also known as Müller's parrot is a large, endangered species of parrot endemic to the Philippines. It is found in tropical moist lowland forests. Flocks are small and often active at night. Its main threats are habitat loss and trapping for the pet trade.

<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.

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

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

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<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.

The Roviana rail is a species of bird in the family Rallidae. It is endemic to the Western Province.

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

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

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<span class="mw-page-title-main">Spot-throated flameback</span> Species of bird

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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. 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.
  3. "Finfoots, flufftails, rails, trumpeters, cranes, Limpkin – IOC World Bird List" . Retrieved 2022-08-24.
  4. "Calayan Rail". eBird. Archived from the original on 2019-05-02.
  5. Allen, Desmond (2020). Birds of the Philippines. Barcelona: Lynx and Birdlife International Fiedlguides. pp. 94–95.
  6. 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.