Christmas Island Emerald Dove

Christmas Island Emerald Dove
Conservation status
Endangered (EPBC Act)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Columbiformes
Family:	Columbidae
Genus:	Chalcophaps
Species:	C. indica
Subspecies:	C. i. natalis
Trinomial name
Chalcophaps indica natalis Lister, 1889
Synonyms
Chalcophaps natalis

The Christmas Island Emerald Dove (Chalcophaps indica natalis), also known as the Christmas Island Green-winged Pigeon, is a bird in the pigeon family Columbidae. It is a distinctive subspecies of the Emerald Dove that is endemic to Christmas Island, an Australian territory in the eastern Indian Ocean.

Description

The Christmas Island Emerald Dove is a small brownish pigeon with green wings. It is some 23–26 cm long, with a 43–46 cm wingspan and a weight of 80-135 g. It is smaller than the mainland Australian subspecies of the dove and differs from them by the adult male having a contrasting light grey cap, with a prominent white forehead, white supercilium extending behind the eye, and a mainly rufous-brown shoulder patch with only a narrow white line along the edge. The adult female has a darker, red-brown head, neck and underparts, lacking the grey and white on the head as well as the pale shoulder patch.^[1][2]

Distribution and habitat

The dove is restricted to the 137 km² Christmas Island where it is common in the tropical rainforest that covers 75% of the island, as well as other terrestrial habitats there, including regrowth forest and settled areas.

Behaviour

The doves are commonly seen in pairs, often on the ground.

Breeding

The dove breeds mainly between October and February, building a frail nest of twigs in tree or bush and laying a clutch of two glossy, cream-coloured eggs.^[3] Incubation takes at least 17 days, with the chicks remaining in the nest for another 12 to 16 days after hatching.^[4] .

Feeding

The dove forages mainly on the ground, feeding on seeds and fallen fruits.^[4]

Status and conservation

In 1988 the population was estimated at about 1000 pairs.^[5] Garnett & Crowley (2000) considered the dove, along with a suite of Christmas Island’s other endemics, as critically endangered, with the principal threat coming from the yellow crazy ants which were accidentally introduced to the island. The threat is not only that of direct ant predation of nestlings, but also indirectly from potentially massive changes to the ecology of the island caused by the ants.^[6] Under the Environment Protection and Biodiversity Conservation Act 1999 it is listed as endangered.

Notes

1. ^ Higgins & Davies, p.873.
2. ^ Chasen, p.62.
3. ^ Higgins & Davies, p.877.
4. ^ ^{a b} Gibson-Hill.
5. ^ Higgins & Davies, p.875.
6. ^ Garnett & Crowley, pp.264 and 652.

References

• Chasen, F.N. (1933). Notes on the Birds of Christmas Island, Indian Ocean. Bulletin of the Raffles Museum 8: 55-87.
• Garnett, Stephen T.; & Crowley, Gabriel M. (2000). The Action Plan for Australian Birds 2000. Environment Australia: Canberra. ISBN 0-642-54683-5[1]
• Gibson-Hill, C.A. (1947). Notes on the birds of Christmas Island. Bulletin of the Raffles Museum 18: 87-165.
• Higgins, P.J.; & Davies, J.N. (eds). (1996). Handbook of Australian, New Zealand and Antarctic Birds. Volume 3: Snipe to Pigeons. Oxford University Press: Melbourne. ISBN 0-19-553070-5

External links

• Australian Government, Dept of the Environment, Water, Heritage and the Arts - Species Profile and Threats Database: Chalcophaps indica natalis — Emerald Dove (Christmas Island)