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Location Cambodia
Central coordinates 103o 19.00' East  13o 51.00' North
IBA criteria A1, A3, A4i, A4iii
Area 12,659 ha
Altitude 14 - 27m
Year of IBA assessment 2003

BirdLife Indochina Programme (BirdLife Direct Action Programme)

Site description The IBA comprises the Ang Tropeang Thmor Sarus Crane Conservation Area. The IBA is centred on an artificial lake, located 70 km to the north-west of Tonle Sap Lake. During the Angkorian period, from the 10th to the 13th century AD, a major causeway was constructed through the area, which led to increased water accumulation to the north. In 1976, during Pol Pot's Democratic Kampuchea regime, forced labor was used to convert an 11 km stretch of this causeway into a dam and to build a 9 km dyke perpendicular to it. However, the planned irrigation reservoir was never completed. Consequently, during the dry season, only the south-eastern corner of the reservoir remains inundated, although, at the height of the wet season, over 80% of the IBA is inundated. Seasonally inundated areas support seasonally inundated grassland, the northern portion of which is inundated for a shorter period each year and has been extensively converted to wet rice agriculture. This land has, however, only been irregularly used for a number of years. In the extreme north of the IBA, the habitat grades into open deciduous dipterocarp forest.The IBA is the most important non-breeding site for Sarus Crane Grus antigone in Cambodia and regularly supports a significant proportion of the global population of the eastern subspecies G. a. sharpii. In addition to Sarus Crane, the IBA regularly supports over 1% of the Asian biogeographic population of Lesser Whistling-duck Dendrocygna javanica, Comb Duck Sarkidiornis melanotus, Asian Openbill Anastomus oscitans and Black-necked Stork Ephippiorhynchus asiaticus. Furthermore, a large number of globally threatened and near-threatened species have been recorded at the IBA, including Bengal Florican Houbaropsis bengalensis (which probably breeds), White-shouldered Ibis Pseudibis davisoni and Greater Adjutant Leptoptilos dubius. Additionally the globally threatened Pallas's Fish Eagle Haliaeetus leucoryphus has been recorded at the site as a vagrant.

Key Biodiversity One Comb Duck recorded by Mundkur in March 1998 and 12 in June 1998. Sarus Cranes are only present in the dry season and leave the site to breeding areas elsewhere with the onset of rains in June. Also Grey Heron, Purple Heron, Brahminy Kite, Baya Weaver.

Non-bird biodiversity: The specific survey combined with all other sources recorded a total of 186 bird species at the site. Apart from the Globally Threatened Sarus Crane, a further eight Globally Threatened and six Globally Near Threatened bird species have been recorded. In addition, 28 bird species of regional conservation concern occur at the site. Elogated Tortoise (Indotestudo elongata) and Malayan Snail-eating Turtle (Malayemys subtrijuga) are collected by villagers from March-May and from June-July. Smooth-coated Otter, Common Palm Civet and Leopard Cat occur in that area as well but they are rare.[Long-tailed Macaque (Macaca fascicularis)]Malayan Box Turtle (Cuora ambionensis), Malayan Snail-eating Turtle (Malayemys subtrijuga), Elongated Tortoise (Indotestudo elongata).Eld's Deer (Cervus eldii)

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Sarkidiornis melanotos unknown  1998  abundant  A4i  Not Recognised 
Lesser Whistling-duck Dendrocygna javanica unknown  1998  abundant  A4i  Least Concern 
Milky Stork Mycteria cinerea non-breeding  1998  rare  A1  Endangered 
Greater Adjutant Leptoptilos dubius unknown  1998  unknown  A1  Endangered 
Lesser Adjutant Leptoptilos javanicus resident  1998  common  A1  Vulnerable 
Asian Openbill Anastomus oscitans non-breeding  1998  abundant  A4i  Least Concern 
Black-necked Stork Ephippiorhynchus asiaticus non-breeding  1998  rare  A4i  Near Threatened 
White-shouldered Ibis Pseudibis davisoni resident  1998  rare  A1  Critically Endangered 
Black-headed Ibis Threskiornis melanocephalus non-breeding  1998  unknown  A4i  Near Threatened 
Spot-billed Pelican Pelecanus philippensis non-breeding  1998  abundant  A1, A4i  Near Threatened 
Greater Spotted Eagle Clanga clanga winter  1998  unknown  A1  Vulnerable 
Eastern Imperial Eagle Aquila heliaca winter  1998  rare  A1  Vulnerable 
Rufous-winged Buzzard Butastur liventer resident  1998  unknown  A3  Least Concern 
Bengal Florican Houbaropsis bengalensis resident  1998  unknown  A1, A3  Critically Endangered 
Sarus Crane Antigone antigone non-breeding  1998  abundant  A1, A4i  Vulnerable 
Blue-winged Pitta Pitta moluccensis breeding  1998  uncommon  A3  Least Concern 
Common Woodshrike Tephrodornis pondicerianus resident  1998  unknown  A3  Least Concern 
Brown-rumped Minivet Pericrocotus cantonensis winter  1998  uncommon  A3  Least Concern 
Burmese Shrike Lanius collurioides winter  1998  unknown  A3  Least Concern 
Racket-tailed Treepie Crypsirina temia resident  1998  unknown  A3  Least Concern 
Indochinese Bushlark Mirafra erythrocephala resident  1998  unknown  A3  Least Concern 
Streak-eared Bulbul Pycnonotus blanfordi resident  1998  unknown  A3  Least Concern 
White-shouldered Starling Sturnus sinensis winter  1998  unknown  A3  Least Concern 
Black-collared Starling Sturnus nigricollis resident  1998  unknown  A3  Least Concern 
Plain-backed Sparrow Passer flaveolus resident  1998  common  A3  Least Concern 
A4iii Species group - waterbirds unknown  2004  20,000 individuals  unknown  A4iii   
Green-eared Barbet Psilopogon faiostrictus resident  1998  unknown  A3  Least Concern 

IBA Monitoring

2010 medium very unfavourable high
Medium - based upon reliable but incomplete / partially representative data

Agriculture and aquaculture annual & perennial non-timber crops - small-holder farming past (and unlikely to return) and no longer limiting majority/most of area/population (50-90%) very rapid to severe deterioration low
Human intrusions and disturbance work and other activities happening now small area/few individuals (<10%) slow but significant deterioration low
Natural system modifications other ecosystem modifications happening now some of area/population (10-49%) slow but significant deterioration medium

Artificial - terrestrial Rice paddies  0 0 moderate (70-90%) moderate (70-90%) unfavourable
Forest   0 0 very poor (< 40%) very poor (< 40%) very unfavourable
Wetlands (inland)   0 0 very poor (< 40%) very poor (< 40%) very unfavourable

Whole area of site (>90%) covered by appropriate conservation designation  A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species  Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity  high 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Ang Trapeng Thmor Protected Forest 12,906 protected area contained by site 10,250  


IUCN habitat Habitat detail Extent (% of site)
Artificial - aquatic   minor
Forest Moist deciduous forest (tropical)  minor
Artificial - terrestrial Rice paddies  50%
Wetlands (inland) Artificial wetlands  minor

Land use

Land-use Extent (% of site)
other -
agriculture -
nature conservation and research -

Protection status Ang Tropeang Thmor Sarus Crane Conservation Area

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 nameGoes, F. and Hong Chamnan (2001). Ang Trapeang Thmor Sarus Crane Conservation Area, a major site for bird conservation in North-west Cambodia. Wildlife Conservation Society, Phnom Penh.

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Ang Tropeang Thmor. Downloaded from on 26/10/2016

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