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Grey Imperial-pigeon Ducula pickeringii

Justification
This species occupies a very small range, currently occurring at perhaps fewer than ten locations. Its range, habitat and numbers are known or inferred to be in decline owing to the increasing conversion of natural forests to palm plantations. These factors qualify it as Vulnerable.

Taxonomic source(s)
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.

Identification
40 cm. Largish imperial-pigeon. Pinkish-grey head, neck and underparts, pinkest on breast and throat, greyest on hindneck. Pale eye-ring and band at base of dark bill. Greyish-brown back, rump and wings with slight green iridescence. Blackish-green tail. Dark iris, reddish legs. Similar spp. Green Imperial-pigeon D. aenea is larger, greener with rufous undertail-coverts. Voice A regular 'woo, woo, woo' usually lasting seven notes but at times shorter (Melville 1997), however, other observers report a deep 'whrrooh' repeated intermittently (Q. Phillipps in litt. 2012). Hints Most conspicuous when coming to roost at favoured islands.

Distribution and population
Ducula pickeringii is known from c.20 small islands off Palawan, Mindanao and in the Sulu archipelago in the southern Philippines, c.13 small islands off the mainland coast of Sabah, Malaysia (north Borneo), the Derawan Islands (including Sangalaki, Kakaban and Maratua), East Kalimantan, Indonesia and the Talaud islands off northern Sulawesi, Indonesia (Collar et al. 1999). Early reports describe it as plentiful at several localities. There are recent (post-1980) records from eight islands in the Philippines (Baguan, Cadiao, Lagen, Tandubatu, Rasa, Bugsok, Pandana and Ursula as well as in Malampaya Sound and Honda Bay), four islands off Sabah, and Sangalaki (Meier 2004) and Karakelang islands (Indonesia), with a maximum count of c.30 on key islands Ursula (Philippines), and Pulau Mantanani (Sabah, Malaysia) indicating that its range and population have decreased significantly. It is reputedly still common on the Talaud Islands (J. Eaton in litt. 2012).


Population justification
A population estimate of 2,500-9,999 individuals has been derived from analysis of records and surveys in BirdLife International (2001). This equates to 1,667-6,666 mature individuals, rounded here to 1,500-7,000 mature individuals.

Trend justification
The species is suspected to be in decline owing to the on-going loss and degradation of its forest habitat, combined with hunting pressure.

Ecology
It inhabits a variety of lowland, primary forest-types, also frequenting secondary forest and cultivated areas with trees. It has been noted feeding on fruits of Ficus procera and Cananga odorata, both common trees in primary forest and secondary habitats (Riley 2003). Little is known about its movements. It is reportedly resident on some northern Bornean islands, but certainly moves between Philippine islands, and varied in abundance from 1995-1997 on Karakelang, Indonesia. Like other small-island specialists, it presumably wanders in search of food.

Threats
Habitat clearance and degradation are the primary threats, with native forest on small islands being replaced by plantations across much of its range. The species's large size and unwary disposition render it vulnerable to hunting whenever it comes into contact with human populations; birds are taken for food, pets and trade. Introduced mammalian predators may cause birds to abandon some islands. Tourism developments may place pressures on island populations when habitat is cleared and through disturbance (G. Davison in litt. 2007). However, some resort development may be positive where resort grounds provide a safe haven (Q. Phillipps in litt. 2012). The effect of competition with Green Imperial-pigeon D. aenea is not understood but this species has begun to outnumber D. pickeringii on Rasa Island (P. Widmann in litt. 2007).

Conservation Actions Underway
There are recent records from several protected areas: Baguan Island within the Turtle Islands Marine Natural Park (Philippines), Tunku Abdul Rahman National Park (off Sabah), the Maratuas and Pulau Mantanani Bird Sanctuary (G. Davison in litt. 2007). Rasa Island (southern Palawan) has also been protected under municipal law since 1999 and under national law since 2005. The species may benefit at this site owing to a wardening scheme in place primarily for the conservation of Philippine Cockatoo (P. Widmann in litt. 2007). The Karakelang Hunting Reserve (Talaud islands) may also offer some protection, but requires evaluation to define boundaries and management needs. Conservation Actions Proposed
Conduct comprehensive surveys of islands, especially in the Sulu archipelago, to clarify its current status, movements and ecological preferences. Assess the potential importance of the extensive mangroves along the east Kalimantan/Sabah coast through further surveys. Propose sites/islands supporting key populations for establishment as strict protected areas, as appropriate (e.g. Ursula). Eradicate macaques and black rats from protected islands. Devise and initiate conservation awareness campaigns to control hunting and curb deforestation on key islands. Seek ban on trade in Imperial pigeons. Review taxonomic status of two subspecies (D. p. pickeringii and D. p. langhornei).


References
BirdLife International. 2001. Threatened birds of Asia: the BirdLife International Red Data Book. BirdLife International, Cambridge, U.K.

Collar, N. J.; Mallari, N. A. D.; Tabaranza, B. R. J. 1999. Threatened birds of the Philippines: the Haribon Foundation/BirdLife International Red Data Book. Bookmark, Makati City.

Meier, G.G. 2004. Grey imperial pigeon: a new record from East Kalimantan, Indonesia. Birding Asia 1: 56-67.

Melville, D. S. 1997. Call of the Grey Imperial Pigeon. Kukila: 172.

Riley, J. 2003. Population sizes and the conservation status of endemic and restricted-range bird species on Karakelang, Talaud Islands, Indonesia. Bird Conservation International 13: 59-74.

Further web sources of information
Detailed species accounts from the Threatened birds of Asia: the BirdLife International Red Data Book (BirdLife International 2001).

Explore HBW Alive for further information on this species

Search for photos and videos, and hear sounds of this species from the Internet Bird Collection

Text account compilers
Benstead, P., Bird, J., Lowen, J., Peet, N., Taylor, J., Tobias, J., Allinson, T

Contributors
Davison, G., Widmann, P., Allen, D., Phillipps, Q., Eaton, J.

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2014) Species factsheet: Ducula pickeringii. Downloaded from http://www.birdlife.org on 01/11/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 01/11/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Additional resources for this species

ARKive species - Grey imperial-pigeon (Ducula pickeringii) 0

Key facts
Current IUCN Red List category Vulnerable
Family Columbidae (Pigeons, Doves)
Species name author (Cassin, 1854)
Population size 1500-7000 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 4,000 km2
Country endemic? No
Links to further information
- Additional Information on this species