Archived 2014 discussion: Taiwan Partridge (Arborophila crudigularis): request for information

This discussion was first published as part of the 2012 Red List update, but remains open for comment to enable reassessment in 2014.

BirdLife species factsheet for Taiwan Partridge Taiwan Partridge Arborophila crudigularis is endemic to the mountains of central Taiwan (China), where it inhabits thickets and dense undergrowth in broadleaved evergreen forest, at 700-3,000 m, although confusingly Brazil (2009) gives an elevation range of 100-2,300 m.

It is currently listed as Near Threatened under criteria B1a+b(iii); C1; C2, on the basis that it is likely to have a small population, occupying a moderately small range, both of which are probably in decline owing to forest clearance for timber extraction and agricultural expansion. An apparent lack of information on the species’s sub-population structure and the level of habitat fragmentation in its range places limitations on its Red List assessment.

Mapping of the species’s range by BirdLife has resulted in an estimated Extent of Occurrence of c.18,200 km2 (based on an elevation range of 700-3,000 m), which meets the range size threshold for Vulnerable under criterion B1. It is not clear, however, if the species’s habitat is severely fragmented, i.e. more than 50% existing in patches that are too small to support viable populations.

BirdLife range map for Taiwan Partridge (click on map to see larger version)

The population is thought to number fewer than 10,000 individuals (del Hoyo et al. 1994). Whilst it is secure in some protected areas, it is suspected to be declining elsewhere owing to on-going deforestation and habitat degradation, and there is a scarcity of records from outside protected areas (Madge and McGowan 2002). Thus, if all mature individuals are shown to form one sub-population, or conversely that all sub-populations number no more than 1,000 individuals, the species could qualify as Vulnerable under criterion C2.

Further information on this species is requested, including details of its likely sub-population structure (the number of sub-populations and the size of the largest and/or the maximum percentage of all mature individuals in one sub-population) and the level of habitat fragmentation in its range (that is, the percentage of suitable habitat that exists in patches too small to support viable populations).

References:

Brazil, M. (2009) Field Guide to the Birds of East Asia. London, UK: Christopher Helm.

del Hoyo, J., Elliott, A. and Sargatal, J. (1994) Handbook of the birds of the world, Vol 2: New World Vultures to Guineafowl. Barcelona, Spain: Lynx Edicions.

Madge, S. and McGowan, P. (2002) Pheasants, partridges and grouse: including buttonquails, sandgrouse and allies. London: Christopher Helm (Helm Identification Guide).

Powerpoint slide from Jerome Ko

Related posts:

  1. Archived 2011-2012 topics: White-necklaced Partridge (Arborophila gingica): downlist to Near Threatened?
  2. Archived 2014 discussion: Chestnut-necklaced Partridge (Arborophila charltonii) is being split: list A. graydoni, A. tonkinensis and A. charltonii as Vulnerable?
  3. Archived 2011-2012 topics: Rock Partridge (Alectoris graeca): uplist to Near Threatened?
  4. Archived 2011-2012 topics: Chinese Hwamei (Garrulax canorus): request for information
  5. Archived 2011-2012 topics: Edwards’s Pheasant (Lophura edwardsi): request for information
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3 Responses to Archived 2014 discussion: Taiwan Partridge (Arborophila crudigularis): request for information

  1. Joe Taylor says:

    Please see below the references for a PowerPoint slide sent by Jerome Ko on 5 February 2014.

  2. Joe Taylor says:

    Preliminary proposals

    Based on available information, our preliminary proposal for the 2014 Red List would be to downlist Taiwan Partridge Arborophila crudigularis to Least Concern.

    There is now a period for further comments until the final deadline of 31 March, after which recommended categorisations will be put forward to IUCN.

    The final Red List categories will be published on the BirdLife and IUCN websites in mid-2014, following further checking of information relevant to the assessments by both BirdLife and IUCN.

  3. Andy Symes says:

    Recommended categorisation to be put forward to IUCN

    Following further review, there has been no change to our preliminary proposal for the 2014 Red List status of this species.

    The final categorisation will be published later in 2014, following further checking of information relevant to the assessment by BirdLife and IUCN.

Comments are closed.