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Biology

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The scientific name of the Negros bleeding-heart hints at the behaviour of this bird. Galli means chicken and columba means pigeon, and this pigeon spends much of its time on the ground searching for food, like a chicken (6), only flying up into trees to roost, take cover or breed (7). Unfortunately, very little information exists regarding the diet and breeding behaviour of this bird, possibly due to its rarity. However, clutches of two eggs were found on the island of Panay in March (8), and the development of two chicks on Panay was closely observed, with the first chick hatching on the 31st May, and the fledging of both chicks on the 12th and 13th June, respectively (9).
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Conservation

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Despite the precarious status of the Negros bleeding-heart, there are very few specific conservation measures in place. It occurs within the Mount Canlaon Natural Park on Negros, and possibly also in the North Negros Forest Reserve. However, the North Negros Forest Reserve receives virtually no protection at present (7). On Panay, it occurs in the North West Panay Peninsula, which was proclaimed a Protected Area in 2001. Forest Rangers, of the Philippine Endemic Species Conservation Project (PESCP), patrol this area, and the northern part of the Central Panay Mountain Range, destroying snares and curbing illegal logging. PESCP also ran an Airgun-for-Rice programme as an intervention against hunting in the region; a large number of airguns were destroyed as a result of the programme (5) (10). Several conservation actions are required to reduce the risk of extinction to the Negros bleeding-heart, primarily the protection of key areas where this species occurs, and the increased protection of existing reserves and parks. Searches for the Negros bleeding-heart should be undertaken, to identify important forest fragments where it occurs, and the initiation of reforestation activities is also recommended (7). Unlike the Mindanao bleeding-heart this species is not yet bred in captivity. Some organizations advocate the captive breeding of the Negros bleeding-heart to prevent its extinction, with the final aim of releasing the birds back into the wild once their habitat has been secured (6). However, given sufficient habitat protection and law enforcement on Panay, it is believed that the species can be saved through pure in situ operation (5).
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Description

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This peculiarly coloured pigeon is one of five bleeding-heart species, called so because of the large blood-red patch on the breast (2) (3). The 'bleeding-heart' varies slightly in shape and colour among species; the Negros bleeding-heart having a narrower red patch on its white breast than other bleeding-hearts (2). It has dark chestnut upperparts with a reddish-purple gloss, creamy-buff underparts, and an iridescent green head and neck (4). It also has a noticeable greyish-white band across its folded wing (2).
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Habitat

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The Negros bleeding-heart inhabits primary forest from 300 to 1000 metres (1) (2). Based on observations, it is not thought that this bird can inhabit secondary forest (5).
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Range

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Found only in the Philippines, on the islands of Negros and Panay (1).
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Status

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Classified as Critically Endangered (CR) on the IUCN Red List 2007 (1).
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Threats

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Like the four other bleeding-heart species that occur in the Philippines, the Negros bleeding-heart is greatly threatened by the destruction of its habitat. In 1988, only four percent of forest cover remained on Negros, and Panay held on to just eight percent of its forest. This alarming loss is due to the clearance of forest for agriculture, timber and charcoal-burning, and these activities remain a serious threat to the remaining fragments of forest. The effect of this devastating habitat destruction is aggravated by local trapping and hunting of the Negros bleeding-heart for food and, presumably, for the cage-bird trade (1). As a result of these threats, the extremely small population of Negros bleeding-hearts, (estimated to be between 50 and 249 individuals), is still declining (4), which makes it extremely vulnerable to extinction.
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Negros bleeding-heart pigeon

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The Negros bleeding-heart pigeon (Gallicolumba keayi) is endemic to the Philippines where it is found on the islands of Negros and Panay. It is critically endangered; continuing rates of forest loss on the two islands where it occurs suggest that it will continue to decline. The population is estimated to be just 50 - 249 mature individuals. The species has an extremely small, severely fragmented population.[3] The bird is listed as an EDGE species under the analysis of the Zoological Society of London.[4]

It is considered one of the Western Visayas Big 5 which includes the Walden's hornbill, Visayan spotted deer, Visayan hornbill and the Visayan warty pig.[5]

Description

Ebird describes it as "A very rare medium-sized ground dove of foothill forest floor on Negros and Panay. Iridescent greenish-blue on the head and sides to the chest, scaled on the upper back, with brownish flight feathers. White underparts narrow from the throat down the chest to the belly. Obvious white crescents mark the wing and sides of the chest. Note the red "bleeding heart" in the center of the chest. Unlikely to be mistaken if seen well. The only other dove likely to flush from the ground would be Asian emerald dove. Song is a short, accelerating series of low notes."[6]

25 cm (10-in) is its total length. Ground-feeder but roosts and nests on bushes or vines; seen in pairs in a flock. Birds with enlarged gonads recorded in April and May and a recent fledgling obtained on May 3.[7]

It has been recorded nesting in March - June with chicks fledging after only 12 days, apparently as an adaptation to the vulnerability of their open and low nests in epiphytic ferns. Nests appear to be regularly predated. The species predominantly feeds on plant material, although there is some potential evidence to suggest that they may also occasionally feed on ground invertebrates.

Habitat and conservation status

The Negros bleeding-heart lives primarily in primary forest up to 1,200 meters above sea level. They are sensitive to habitat disturbance and do not tolerate second growth as well but there are some sparse records..

It is critically endangered with the population estimated to be 50 -249 mature individuals remaining. They are threatened by hunting for food, trapping for the pet trade and habitat loss .[8] Continuing rates of forest loss on the two islands where it occurs suggest that it will continue to decline. By 2007, Negros and Panay had a 3% and 6% remaining forest cover with most of this being higher elevation forest where this bird does not thrive in. Despite already paltry forest cover, deforestation still continues thanks to both legal and illegal logging, conversion into farmland, mining and road development. Trapping and hunting for food and, presumably, for the cage-bird trade constitute other threats.

It was bred for the first time in captivity in 2007 at the Center for Tropical Conservation Studies. As of 2013, the captive population totals 18 individuals, 14 of which have been bred from birds confiscated from the illegal bird trade. Captive breeding is being undertaken by the Talarak Foundation supported by the Philippines Biodiversity Conservation Foundation. There are plans for future reintroductions.

Conservation actions proposed include fieldwork and surveys in areas where they have been reported and other areas with suitable habitats. Provide protection for existing habitats like the Northern Negros Forest reserve. Encourage reforestation activities with an emphasis on native trees. Create education and awareness campaigns to aid in conservation and prevent hunting and the pet trade.[9]

References

  1. ^ a b BirdLife International (2018). "Gallicolumba keayi". IUCN Red List of Threatened Species. 2018: e.T22690988A130328535. doi:10.2305/IUCN.UK.2018-2.RLTS.T22690988A130328535.en. Retrieved 13 November 2021.
  2. ^ Clarke, W.E. (1900). "Phlegoenas keayi". Ibis. 6: 359. Pl VIII
  3. ^ "CONSERVATION OF THE CRITICALLY ENDANGERED NEGROS BLEEDING HEART PIGEON Gallicolumba keayi ON THE ISLAND OF NEGROS, PHILIPPINES" (PDF).{{cite web}}: CS1 maint: url-status (link)
  4. ^ "Negros Bleeding-heart | Gallicolumba keayi".
  5. ^ "Talarak Big 5". Talarak Foundation.{{cite web}}: CS1 maint: url-status (link)
  6. ^ "Negros Bleeding Heart". Ebird.{{cite web}}: CS1 maint: url-status (link)
  7. ^ "First nesting observations of the Negros Bleeding-heart Gallicolumba keayifrom Panay, Philippines".{{cite web}}: CS1 maint: url-status (link)
  8. ^ Klop, Erik; Curio, Eberhard; de Soye, Yves (January 1998). "A new population of Bleeding-heart Pigeon (Gallicolumba sp.) and its conservation relevance on Panay, Philippines". Journal für Ornithologie. 139 (1): 76–77. doi:10.1007/bf01651320. ISSN 0021-8375. S2CID 43499145.
  9. ^ International), BirdLife International (BirdLife (2018-08-07). "IUCN Red List of Threatened Species: Gallicolumba keayi". IUCN Red List of Threatened Species. Retrieved 2021-09-15.

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Negros bleeding-heart pigeon: Brief Summary

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The Negros bleeding-heart pigeon (Gallicolumba keayi) is endemic to the Philippines where it is found on the islands of Negros and Panay. It is critically endangered; continuing rates of forest loss on the two islands where it occurs suggest that it will continue to decline. The population is estimated to be just 50 - 249 mature individuals. The species has an extremely small, severely fragmented population. The bird is listed as an EDGE species under the analysis of the Zoological Society of London.

It is considered one of the Western Visayas Big 5 which includes the Walden's hornbill, Visayan spotted deer, Visayan hornbill and the Visayan warty pig.

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