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Bougainville Bush-warbler Cettia haddeni

Justification
This enigmatic species is extremely poorly known, hampering efforts to assign its conservation status. However it has a moderately small range and is probably declining owing to introduced predators and forest degradation. For these reasons it is classified as Near Threatened.

Taxonomic source(s)
Lecroy, M.; Barker, F. K. 2006. A new species of Bush-warbler from Bougainville Island and a monophyletic origin for southwest Pacific Cettia. American Museum Novitates 3511: 1-20.

Taxonomic note
Described as new to science by LeCroy and Barker (2006).

Distribution and population
Cettia haddeni is endemic to the island of Bougainville, Papua New Guinea. It has only recently been described, although its existence has long been known to local inhabitants (Lecroy and Barker 2006). Since 1972, ornithologists have been aware of its presence, but only through voice (Lecroy and Barker 2006). Years of civil war prevented fieldwork in the 1990s and it was not until 2000 that the first individual was mist-netted (Lecroy and Barker 2006). A further two were caught within a few months and it appeared to be fairly widespread and not uncommon in suitable habitat (Lecroy and Barker 2006). However, others have found it to be absent from the highest altitudes and it may therefore only occur within a relatively narrow altitudinal band (B. Beehler in litt. 2007).

Population justification
The global population size has not been quantified, but the species is reported to be locally common (Baker 1997).

Trend justification
There are no data on population trends, but this species is suspected to be in decline owing to habitat degradation and predation by introduced carnivores.

Ecology
It inhabits montane forest at 700-1,500 m. Reported to forage mostly on the ground, sometimes in association with Island Thrush Turdus poliocephalus (Dutson 2011).

Threats
No specific threats are known; however, it is probably threatened by small scale clearance of forest for agriculture and also from predation by introduced black rats Rattus rattus and feral cats.

Conservation Actions Underway
None is known. Conservation Actions Proposed
Survey to reveal the upper and lower elevational limits of its range. Protect significant areas of high elevation forest in the form of community conservation areas. Research the effects of introduced predators on the species.

References
Baker, K. 1997. Warblers of Europe, Asia and North Africa. Princeton University Press, Princeton.

Dutson, G. 2011. Birds of Melanesia: Bismarcks, Solomons, Vanuatu and New Caledonia. Christopher Helm, London.

Lecroy, M. and Barker, F.K. 2006. A new species of bush-warbler from Bougainville Island and a monophyletic origin for southwest Pacific Cettia. American Museum Novitates: 1-20.

Further web sources of information
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
Derhé, M., Mahood, S.

Contributors
Beehler, B.

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

Recommended citation
BirdLife International (2014) Species factsheet: Cettia haddeni. Downloaded from http://www.birdlife.org on 01/08/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 01/08/2014.

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.

Key facts
Current IUCN Red List category Near Threatened
Family Sylviidae (Old World warblers)
Species name author Lecroy & Barker, 2006
Population size Unknown mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 550 km2
Country endemic? Yes
Links to further information
- Additional Information on this species