email a friend
printable version
closeIUCN Red List history
| Year | Category |
|---|---|
| 2012 | Least Concern |
| 2009 | Least Concern |
| 2008 | Least Concern |
| 2004 | Least Concern |
| 2000 | Lower Risk/Least Concern |
| 1994 | Lower Risk/Least Concern |
| 1988 | Lower Risk/Least Concern |
Species attributes
| Migratory status | not a migrant | Forest dependency | Does not normally occur in forest |
| Land mass type | Average mass | - |
Distribution
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 4,900 | medium |
| Extent of Occurrence non-breeding (km2) | 3,940,000 | medium |
| Number of locations | - | |
| Fragmentation | - |
Population & trend
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | poor | Estimated | 2009 | |
| Population trend | Stable | - | ||
| Number of subpopulations | - | - | - | |
| Largest subpopulation | - | - | - | |
| Generation length (yrs) | 11.5 | - | - | - |
| Population justification: The species has a large global population with an estimated minimum of 1,200,000 individuals (Wetlands International 2006). In the Seychelles, populations were estimated at 100,000 pairs on Cousin Island in 1974 and 18,000 pairs on Aride Island in 1972, and 250,000 pairs on Serpent Island in 19752 and 5,000 pairs on Lizard Island, Mauritius (Higgins and Davies 1996). In the Houtman Albrolhos, populations were estimated at 7,665, 6,325 and 34,895 pairs on Morley, Wooded and Pelsart Island respectively in 1993 (Higgins and Davies 1996). | ||||
| Trend justification: The overall population trend is stable, although some populations have unknown trends (Wetlands International 2006). | ||||
Country/Territory distribution
| Country/Territory | Occurrence status | Extinct | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|
| Australia | Native | No | Yes | ||
| British Indian Ocean Territory | Native | No | Yes | ||
| Comoros | Vagrant | No | Yes | ||
| French Southern Territories | Unknown | No | |||
| Kenya | Vagrant | No | Yes | ||
| Madagascar | Unknown | No | |||
| Maldives | Native | No | Yes | ||
| Mauritius | Native | No | Yes | ||
| Mayotte (to France) | Unknown | No | |||
| Mozambique | Unknown | No | |||
| Oman | Native | No | Yes | ||
| Réunion (to France) | Unknown | No | |||
| Seychelles | Native | No | Yes | ||
| South Africa | Vagrant | No | Yes | ||
| Sri Lanka | Vagrant | No | |||
| Tanzania | Native | No | Yes | ||
| Tonga | Native | No | Yes | ||
| United Arab Emirates | Vagrant | No | Yes |
Important Bird Areas where this species has triggered the IBA criteria
| Country/Territory | IBA Name | IBA link |
|---|---|---|
| British Indian Ocean Territory | Nelson, Chagos Bank |  |
| British Indian Ocean Territory | Petite Ile Bois Mangue, Peros Banhos | |
| British Indian Ocean Territory | South Brother, Chagos Bank | |
| Maldives | Haa Alifu Atoll | |
| Mauritius | Cargados Carajos shoals (Saint Brandon) | |
| Mauritius | Serpent Island | |
| Seychelles | Aride island | |
| Seychelles | Cousin island | |
| Seychelles | Cousine island | |
| Seychelles | Frégate island | |
| Seychelles | Marie Louise island | |
Habitats & altitude
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Marine Coastal/Supratidal | Sea Cliffs and Rocky Offshore Islands | major | resident |
| Marine Neritic | Macroalgal/Kelp | major | resident |
| Marine Neritic | Pelagic | major | resident |
| Marine Neritic | Seagrass (Submerged) | major | resident |
| Marine Neritic | Subtidal Loose Rock/pebble/gravel | major | resident |
| Marine Neritic | Subtidal Rock and Rocky Reefs | major | resident |
| Marine Neritic | Subtidal Sandy | major | resident |
| Marine Neritic | Subtidal Sandy-Mud | major | resident |
| Marine Oceanic | Epipelagic (0-200m) | suitable | resident |
| Altitude | 0 - 0 m | Occasional altitudinal limits |
Recommended citation
BirdLife International (2013) Species factsheet: Anous tenuirostris. Downloaded from
http://www.birdlife.org on 22/05/2013.
Recommended citation for factsheets for more than one species: BirdLife International (2013) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 22/05/2013.
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.
| Key facts | |
|---|---|
| Current IUCN Red List category | Least Concern |
| Family | Laridae (Gulls and terns) |
| Species name author | (Temminck, 1823) |
| Population size | mature individuals |
| Population trend | Stable |
| Distribution size (breeding/resident) | 4,900 km2 |
| Country endemic? | No |
| Links to further information | |
|
- Summary information on this species - Climate change species distributions | |
|
|