LC
Tonkin Partridge Arborophila tonkinensis



Justification

Justification of Red List Category
Although this species may have a restricted range, it is not believed to approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Population justification
The global population size has not been quantified following recent taxonomic splits.

Trend justification
There are no data on population trends; however, despite its tolerance for disturbed and modified habitats and resilience to hunting pressure, some overall declines are likely.

Distribution and population

A. tonkinensis is found in Tonkin, Vietnam, up to 500 m (Madge and McGowan 2002). It is described as locally common and occurs in at least three protected areas (BirdLife International 2001, Madge and McGowan 2002).

Ecology

Inhabits dense evergreen forest and probably also secondary and logged forest (Madge and McGowan 2002).

Identification

26-32 cm. Medium-sized forest partridge with a narrow chestnut collar and tawny-stained white ear coverts with black spotting. Similar spp. A. graydoni has dirty-white ear coverts and has much darker chestnut on the plain belly. A. charltonii has a plain tawny ear covert patch and also has black necklace around lower throat to ear coverts. From Bar-backed Partridge A. brunneopectus by plainer upperside, heavy black breast markings, greenish to yellowish-green legs and distinctive ear-patch and collar. From extralimital Scaly-breasted and Annam Partridges A. merlini by chestnut ear-patch and collar. Voice. Similar to Scaly-breasted (see Annam).

Acknowledgements

Text account compilers
Butchart, S., Ekstrom, J., Harding, M., Martin, R, Taylor, J. & Symes, A.

Contributors
Mahood, S., Duckworth, J.W. & Timmins, R.


Recommended citation
BirdLife International (2019) Species factsheet: Arborophila tonkinensis. Downloaded from http://www.birdlife.org on 14/11/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 14/11/2019.