Justification This species is classified as Near Threatened because it is thought to have a moderately small population which is declining throughout its range, mainly as a result of hunting and habitat degradation.

Family/Sub-family Columbidae

Species name author Swinhoe, 1863

Taxonomic source(s) Sibley and Monroe (1990, 1993)

Identification

Population estimate

Population trend

Range estimate (breeding/resident)

Country endemic?

unknown

decreasing

40,400 km²

No

Range & population Treron formosae, considered a small-island specialist, nests in the Nansei Shoto islands of Japan, Taiwan (China) and the Batanes islands north of Luzon, Philippines; it is uncommon and local on the Batanes, rare in Taiwan and common only in the Nansei Shoto.

Ecology: It inhabits subtropical broadleaved evergreen forest, cultivated fields where there are trees nearby, and even towns where there are gardens, mainly on small islands but at up to 2,000 m on Taiwan.

Threats In the Philippines, threats presumably comprise deforestation and hunting while commercial development through tourism is an imminent threat to Mt Irada. Threats elsewhere are poorly known.

Conservation measures underway None is known.

Conservation measures proposed Survey to assess population size. Regularly monitor at certain sites throughout its range to determine population trends. Investigate the extent of hunting by local residents. Where relevant, control hunting where possible, perhaps using awareness campaigns. Protect significant areas of suitable forest across its altitudinal range.

References BirdLife International (2001).

Further web sources of information

Fully detailed species accounts from the Threatened birds of Asia: the BirdLife International Red Data Book (BirdLife International 2001), together with new information collated since the publication of the Red Data Book

Text account compilers Phil Benstead (BirdLife International), Simon Mahood (BirdLife International)

IUCN Red List evaluators Stuart Butchart (BirdLife International), Simon Mahood (BirdLife International)

Recommended citation BirdLife International (2009) Species factsheet: Treron formosae. Downloaded from http://www.birdlife.org on 9/2/2010

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.

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