| |
Estimate |
Data quality |
Derivation |
Year of estimate |
| No. of mature individuals |
2500-9999 |
poor |
Estimated |
2012 |
| Population trend |
Decreasing |
poor |
|
- |
| Number of subpopulations |
2-100 |
- |
- |
- |
| Largest subpopulation |
251-1000 |
- |
- |
- |
| Generation length (yrs) |
6.6 |
- |
- |
- |
|
Population justification: The global population was estimated to number c.2,600-3,400 individuals, roughly equivalent to 1,700-2,300 mature individuals, based on recent records and surveys (BirdLife International 2001). However, this is thought to be an underestimate, as the number in China alone is estimated at c.1,000 mature individuals and could be around 1,500-2,000 mature individuals (Xiaolin Chen et al. in litt. 2012). On this basis, the population is placed in the band for 2,500-9,999 mature individuals, which is probably equivalent to 3,800-15,000 individuals, assuming that mature individuals account for around 2/3 of the population. |
|
Trend justification: Surveys of a breeding population on an offshore island in southern China indicate a decline of 22% over six years (Xiaolin Chen et al. in litt. 2012). There is little additional evidence for a significant decline in this species's population over the last ten years, although overall some decline (<20% over ten years) is suspected to be occurring, owing to on-going loss and degradation of available habitat through reclamation, especially of offshore breeding islands. |
| Country/Territory |
IBA Name |
IBA link |
| Brunei |
Brunei Bay |
 |
| Brunei |
Seria Coast |
 |
| Brunei |
Wasan |
 |
| China (mainland) |
Beidaihe |
 |
| China (mainland) |
Coast between Ao Jiang and Feiyun Jiang |
 |
| China (mainland) |
Eastern tidal flat of Nanhui |
 |
| China (mainland) |
Futian Nature Reserve |
 |
| China (mainland) |
Hailü Dao |
 |
| China (mainland) |
Haimao Dao Island |
 |
| China (mainland) |
Jiushan Islands Nature Reserve |
 |
| China (mainland) |
Laotieshan |
 |
| China (mainland) |
Min Jiang Estuary |
 |
| China (mainland) |
Nanliu Jiang Estuary |
 |
| China (mainland) |
Rong Jiang Estuary |
 |
| China (mainland) |
She Dao Island |
 |
| China (mainland) |
Shicheng Dao Island |
 |
| China (mainland) |
Shuangtai (Shuangtaizi) Estuary and Inner Gulf of Liaodong |
 |
| China (mainland) |
Weizhou Dao Nature Reserve |
 |
| China (mainland) |
Wuchishan Dao Nature Reserve |
 |
| China (mainland) |
Xingkai Hu Nature Reserve |
 |
| China (mainland) |
Xingren Tuo Island |
 |
| China (mainland) |
Yalu Jiang Estuary |
 |
| China (mainland) |
Yueqing Wan |
 |
| Hong Kong (China) |
Inner Deep Bay and Shenzhen River catchment area |
 |
| Indonesia |
Delta Mahakam |
 |
| Indonesia |
Kutai |
 |
| Indonesia |
Morowali Nature Reserve |
 |
| Malaysia |
Bako-Buntal Bay |
 |
| Malaysia |
Brunei Bay |
 |
| Malaysia |
Kinabatangan floodplain |
 |
| Malaysia |
Klias peninsula |
 |
| Malaysia |
Matang coast |
 |
| Malaysia |
North-central Selangor coast |
 |
| Malaysia |
Pulau Bruit National Park |
 |
| Malaysia |
Sadong-Saribas coast |
 |
| Malaysia |
South-west Johor coast |
 |
| Malaysia |
Tanjung Datu-Samunsam Protected Area |
 |
| North Korea |
Chongchon River estuary (including Mundok Nature Reserve) |
 |
| North Korea |
Daedong Bay |
 |
| North Korea |
Dok-do island |
 |
| North Korea |
Kangryong field |
 |
| North Korea |
Onchon field |
 |
| North Korea |
Rab-do and Muki-do islands |
 |
| North Korea |
Sogam-do, Daegam-do, Zung-do, Ae-do and Hyengzedo islands |
 |
| North Korea |
Unryul Kumsanpo |
 |
| Philippines |
Basilan Natural Biotic Area |
 |
| Philippines |
Calauit Island |
 |
| Philippines |
Mactan, Kalawisan and Cansaga Bays |
 |
| Philippines |
Manila Bay |
 |
| Philippines |
Mount Makiling Forest Reserve |
 |
| Philippines |
Olango Island |
 |
| Philippines |
Pagbilao and Tayabas Bay |
 |
| Philippines |
Pasonanca Natural Park |
 |
| Philippines |
Polillo Islands |
 |
| Philippines |
Ragay Gulf |
 |
| Philippines |
Sibutu and Tumindao Islands |
 |
| Philippines |
Talibon Protected Landscape and Seascape |
 |
| Philippines |
Tubbataha Reef National Marine Park |
 |
| Philippines |
Victoria and Anepahan Ranges |
 |
| Russia (Asian) |
Lower Tumen river |
 |
| Singapore |
Kranji |
 |
| Singapore |
North-East Conservation Area |
 |
| South Korea |
Baeksu tidal flat |
 |
| South Korea |
Cheonsu Bay |
 |
| South Korea |
Daebu-do island |
 |
| South Korea |
Dongjin estuary |
 |
| South Korea |
Hampyeong Bay |
 |
| South Korea |
Mangyeong estuary |
 |
| South Korea |
Muan tidal flat |
 |
| South Korea |
Nakdong-gang estuary |
 |
| South Korea |
Sihwa-ho lake |
 |
| South Korea |
Tidal flat area of southern Ganghwa-do island |
 |
| South Korea |
Tidal flat area of Yeongjong-do island |
 |
| South Korea |
Yeongheung-do and Sonje-do islands |
 |
| Taiwan (China) |
Chihben Wetlands |
 |
| Taiwan (China) |
Chu'an |
 |
| Taiwan (China) |
Dapingding and Hsutsuo Harbor |
 |
| Taiwan (China) |
Hsinchu City Coastal Area |
 |
| Taiwan (China) |
Hualien River Estuary |
 |
| Taiwan (China) |
Kaomei Wetlands |
 |
| Taiwan (China) |
Lanyang River Estuary |
 |
| Taiwan (China) |
Matsu (Mazu) Islands Tern Refuge |
 |
| Taiwan (China) |
Watzuwei Nature Reserve |
 |
| Taiwan (China) |
Yieliu |
 |
| Thailand |
Laem Pakarang |
 |
| Thailand |
Na Muang Krabi |
 |
| Vietnam |
Ba Tri |
 |
| Vietnam |
Bai Boi |
 |
| Vietnam |
Binh Dai |
 |
| Vietnam |
Dat Mui |
 |
| Vietnam |
Nghia Hung |
 |
| Vietnam |
Thai Thuy |
 |
| Vietnam |
Xuan Thuy |
 |
| Threat (level 1) |
Threat (level 2) |
Impact and Stresses |
| Residential & commercial development |
Commercial & industrial areas |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Slow, Significant Decline |
Medium Impact: |
| Stresses |
| Ecosystem degradation, Ecosystem conversion |
|
| Residential & commercial development |
Tourism & recreation areas |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Slow, Significant Decline |
Low Impact: 5 |
| Stresses |
| Ecosystem degradation, Ecosystem conversion |
|
| Agriculture & Aquaculture |
Annual & perennial non-timber crops / Agro-industry farming |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Slow, Significant Decline |
Medium Impact: |
| Stresses |
| Ecosystem degradation, Ecosystem conversion |
|
| Agriculture & Aquaculture |
Annual & perennial non-timber crops / Scale Unknown/Unrecorded |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Slow, Significant Decline |
Medium Impact: |
| Stresses |
| Ecosystem degradation, Ecosystem conversion |
|
| Transportation & service corridors |
Roads & railroads |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Slow, Significant Decline |
Medium Impact: |
| Stresses |
| Ecosystem degradation, Ecosystem conversion |
|
| Biological resource use |
Hunting & trapping terrestrial animals / Intentional use (species is the target) |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Slow, Significant Decline |
Low Impact: 5 |
| Stresses |
| Species mortality |
|
| Human intrusions & disturbance |
Recreational activities |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Slow, Significant Decline |
Low Impact: 5 |
| Stresses |
| Species disturbance |
|
| Human intrusions & disturbance |
Work & other activities |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Slow, Significant Decline |
Low Impact: 5 |
| Stresses |
| Species disturbance, Ecosystem degradation, Ecosystem conversion |
|
| Pollution |
Agricultural & forestry effluents / Type Unknown/Unrecorded |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Slow, Significant Decline |
Medium Impact: |
| Stresses |
| Ecosystem degradation, Ecosystem conversion |
|
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.
To provide new information to update this factsheet or to correct any errors, please email BirdLife
To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.