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Location Cambodia, Stung Treng
Central coordinates 106o 14.00' East  14o 7.00' North
IBA criteria A1, A3, A4i
Area 138,137 ha
Altitude 55 - 186m
Year of IBA assessment 2003

BirdLife Indochina Programme (BirdLife Direct Action Programme)

Site description The IBA comprises of an area of open deciduous dipterocarp forest in western Siem Pang District, which is bordered to the east by the Sekong River, and to the north and west by Xe Pian Protected Area in Laos. The topography of the IBA is dominated by a flat plain, which rises in the extreme north, close to the international border with Laos, to form a series of low hills. The vegetation of the IBA is dominated by deciduous dipterocarp forest, which is relatively open in places and denser in others, and has a grassy understorey. Scattered throughout the forest are a number of pools and seasonally wet meadows. The western bank of the Sekong River supports a strip of tall gallery forest, while the hills in the north of the IBA support semi-evergreen forest. Along the western bank of the Sekong River, in the area to the west of Siem Pang town, and along the road between Siem Pang town and Road No. 13, areas of forest have been converted into agricultural land, much of which is only cultivated during the rainy season.The IBAsupports the most significant population of the globally critical White-shouldered Ibis Pseudibis davisoni yet known in Cambodia. This species has been observed at a number of wetlands on the flat plain, close to Siem Pang town, and is reported to breed in the west of the district, close to the international border with Laos. The IBA also supports a range of other globally threatened and near-threatened bird species, characteristic of the dry forests of central Indochina, including vultures, Green Peafowl (Pavo muticus), Sarus Crane (Grus antigone), Giant Ibis (Pseudibis gigantea), Lesser Adjutant (Leptoptilos javanicus) and Asian Golden Weaver (Ploceus hypoxanthus).

Key Biodiversity 

Non-bird biodiversity: Mr Kri Vana reported that he saw a Tiger 25 km to the west of Siem Pang town in 1995, while he was in the forest extracting timber. From the description given, it was impossible to determine with certainty whether the report referred to Tiger or Leopard (Panthera pardus). The two local rangers reported that the commonest large mammals in western Siem Pang district were Sambar (Cervus unicolor) and Indian Muntjac (Muntiacus muntjak). Another species reported to be present in western Siem Pang district was Dhole (Cuon alpinus). However, both informants reported that there were no Asian Elephant (Elephas maximus) in western Siem Pang district.Long-tailed Macaque (Macaca fascicularis), Silvered Langur (Semnopithecus cristatus).Banteng (Bos javanicus), Gaur (Bos gaurus), Eld's Deer (Cervus eldii).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Green Peafowl Pavo muticus resident  2002  rare  A1, A3  Endangered 
Lesser Adjutant Leptoptilos javanicus resident  2002  rare  A1  Vulnerable 
White-shouldered Ibis Pseudibis davisoni resident  2002  common  A1  Critically Endangered 
Giant Ibis Thaumatibis gigantea resident  2002  rare  A1, A4i  Critically Endangered 
Greater Spotted Eagle Clanga clanga winter  2002  rare  A1  Vulnerable 
White-rumped Vulture Gyps bengalensis non-breeding  2002  rare  A1, A3  Critically Endangered 
Red-headed Vulture Sarcogyps calvus non-breeding  2002  rare  A3  Critically Endangered 
Slender-billed Vulture Gyps tenuirostris non-breeding  2002  present  A1  Critically Endangered 
Rufous-winged Buzzard Butastur liventer resident  2002  common  A3  Least Concern 
Sarus Crane Antigone antigone unknown  2002  rare  A1  Vulnerable 
Common Woodshrike Tephrodornis pondicerianus resident  2002  common  A3  Least Concern 
Small Minivet Pericrocotus cinnamomeus resident  2002  common  A3  Least Concern 
White-browed Fantail Rhipidura aureola resident  2002  common  A3  Least Concern 
Brown Prinia Prinia polychroa resident  2002  common  A3  Least Concern 
Sooty-headed Bulbul Pycnonotus aurigaster resident  2002  common  A3  Least Concern 
Streak-eared Bulbul Pycnonotus blanfordi resident  2002  common  A3  Least Concern 
Lineated Barbet Psilopogon lineatus resident  2002  common  A3  Least Concern 

IBA Monitoring

2013 high not assessed low

Agriculture and aquaculture annual & perennial non-timber crops - agro-industry farming likely in short term (within 4 years) majority/most of area/population (50-90%) very rapid to severe deterioration high
Biological resource use logging & wood harvesting - unintentional effects: subsistence/small scale happening now whole area/population (>90%) slow but significant deterioration high

Little/none of site covered (<10%)  A management plan exists but it is out of date or not comprehensive  Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity  low 

Local conservation groups The local conservation group below is working to support conservation at this IBA.

Name Year formed
Western Siem Pang Local Conservation Group 2004


IUCN habitat Habitat detail Extent (% of site)
Forest Dry deciduous forest (tropical); Lowland evergreen rain forest (tropical); Semi-evergreen rain forest (tropical)  -
Shrubland Secondary scrub  -
Grassland Edaphic grassland  -
Wetlands (inland) Ephemeral wetlands; Freshwater lakes and pools; Rivers and streams  -
Artificial - terrestrial Forestry and agro-industrial plantations; Perennial crops, orchards and groves; Rice paddies; Small settlements, rural gardens  -

Land use

Land-use Extent (% of site)
agriculture -
Notes: permanent and shifting agriculture
not utilised -
Notes: small settlements

Further web sources of information 

Site account from Directory of Important Bird Areas in Cambodia: key sites for conservation (Seng Kim Hout 2003)

References Document nameBarzen, J. (2001) Waterbirds and Wetlands of Northern Cambodia. Bugle. 27(4): 1-2.Barzen, J. (2002) Waterbirds and Wetlands of Northern Cambodia. Cambodia Bird News 9:36-38.Goes, F. (ed.) (2000) Brief News. Cambodia Bird News 4: 59-60Goes, F. and Davidson, P. (eds.) (2002) Recent Sightings. Cambodia Bird News 9: 47-59.Tordoff, A. W., Seng Kim Hout, Pech Bunnat and Sam Sika (2002). A survey for White-shouldered Ibis in western Siem Pang District, Stung Treng Province. Unpublished report, Wildlife Conservation Society, Cambodia.

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Western Siem Pang. Downloaded from on 26/10/2016

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