IUCN Red List Criteria
| Critically Endangered |
|
| Endangered |
D |
| Vulnerable |
D2 |
IUCN Red List history
| Year |
Category |
| 2012 |
Endangered |
| 2010 |
Endangered |
| 2008 |
Endangered |
| 2006 |
Endangered |
| 2004 |
Endangered |
| 2000 |
Endangered |
| 1996 |
Endangered |
| 1994 |
Endangered |
| 1988 |
Threatened |
Species attributes
| Migratory status |
full migrant |
Forest dependency |
Does not normally occur in forest |
| Land mass type |
|
Average mass |
- |
Distribution
| |
Estimate |
Data quality |
| Extent of Occurrence breeding/resident (km2) |
623,000 |
medium |
| Area of Occupancy breeding/resident (km2) |
1 |
medium |
| Number of locations |
1 |
- |
| Fragmentation |
|
- |
Population & trend
| |
Estimate |
Data quality |
Derivation |
Year of estimate |
| No. of mature individuals |
142 |
good |
Estimated |
2005 |
| Population trend |
Increasing |
good |
|
- |
| Number of subpopulations |
|
- |
- |
- |
| Largest subpopulation |
|
- |
- |
- |
| Generation length (yrs) |
15.6 |
- |
- |
- |
|
Population justification: The population is estimated to number 250 individuals, including 71 breeding pairs and thus a minimum 142 mature individuals (J. Madeiros in litt. 2005). |
|
Trend justification: The population has increased from 18 pairs in 1951 to 71 pairs in 2005. This is equivalent to an increase of well over 79% in three generations, given the species's long lifespan. Records of 40 chicks fledged in 2008 and 35 chicks hatched in 2009 suggest the population continues to increase. |
Country/Territory distribution
| Country/Territory |
Occurrence status |
Extinct |
Breeding |
Non-breeding |
Passage |
| Bahamas |
Vagrant |
No |
|
|
|
| Bermuda (to UK) |
Native |
No |
Yes |
|
|
| Canada |
Unknown |
No |
|
|
|
| Portugal |
Vagrant |
No |
|
|
|
| USA |
Native |
No |
|
Yes |
|
Important Bird Areas where this species has triggered the IBA criteria
| Country/Territory |
IBA Name |
IBA link |
| Bermuda (to UK) |
Cooper's Island and Castle Islands |
 |
Habitats & altitude
| Habitat (level 1) |
Habitat (level 2) |
Importance |
Occurrence |
| Marine Coastal/Supratidal |
Sea Cliffs and Rocky Offshore Islands |
major |
breeding |
| Marine Neritic |
Macroalgal/Kelp |
suitable |
breeding |
| Marine Neritic |
Macroalgal/Kelp |
suitable |
non-breeding |
| Marine Neritic |
Pelagic |
major |
breeding |
| Marine Neritic |
Pelagic |
major |
non-breeding |
| Marine Neritic |
Seagrass (Submerged) |
suitable |
non-breeding |
| Marine Neritic |
Seagrass (Submerged) |
suitable |
breeding |
| Marine Neritic |
Subtidal Loose Rock/pebble/gravel |
suitable |
breeding |
| Marine Neritic |
Subtidal Loose Rock/pebble/gravel |
suitable |
non-breeding |
| Marine Neritic |
Subtidal Rock and Rocky Reefs |
suitable |
non-breeding |
| Marine Neritic |
Subtidal Rock and Rocky Reefs |
suitable |
breeding |
| Marine Neritic |
Subtidal Sandy |
suitable |
non-breeding |
| Marine Neritic |
Subtidal Sandy |
suitable |
breeding |
| Marine Neritic |
Subtidal Sandy-Mud |
suitable |
breeding |
| Marine Neritic |
Subtidal Sandy-Mud |
suitable |
non-breeding |
| Marine Oceanic |
Epipelagic (0-200m) |
major |
breeding |
| Marine Oceanic |
Epipelagic (0-200m) |
major |
non-breeding |
|
Altitude
|
0 - 79 m
|
Occasional altitudinal limits
|
|
Threats & impact
| Threat (level 1) |
Threat (level 2) |
Impact and Stresses |
| Residential & commercial development |
Housing & urban areas |
Timing |
Scope |
Severity |
Impact |
| Past, Unlikely to Return |
Whole (>90%) |
Rapid Declines |
Past Impact |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion |
|
| Invasive non-native/alien species/diseases |
Problematic native species/diseases |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Whole (>90%) |
No decline |
Medium Impact: |
|
| Invasive non-native/alien species/diseases |
Invasive non-native/alien species/diseases / Brown Rat (Rattus norvegicus) |
Timing |
Scope |
Severity |
Impact |
| Past, Unlikely to Return |
Majority (50-90%) |
Rapid Declines |
Past Impact |
| Stresses |
|---|
| Reduced reproductive success |
|
| Pollution |
Excess energy / Light pollution |
Timing |
Scope |
Severity |
Impact |
| Past, Unlikely to Return |
Whole (>90%) |
No decline |
Past Impact |
| Stresses |
|---|
| Species disturbance |
|
| Climate change & severe weather |
Habitat shifting & alteration |
Timing |
Scope |
Severity |
Impact |
| Future |
Whole (>90%) |
Unknown |
Unknown |
| Stresses |
|---|
| Indirect ecosystem effects, Ecosystem degradation, Ecosystem conversion |
|
| Climate change & severe weather |
Storms & flooding |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Whole (>90%) |
No decline |
Medium Impact: |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion, Reduced reproductive success |
|
Utilisation
| Purpose |
Primary form used |
Life stage used |
Source |
Scale |
Level |
Timing |
| Food (human) |
Whole |
Adults and juveniles |
Wild |
Subsistence, National |
Non-trivial |
Historical |
Recommended citation
BirdLife International (2013) Species factsheet: Pterodroma cahow. Downloaded from
http://www.birdlife.org on 20/05/2013.
Recommended citation for factsheets for more than one species: BirdLife International (2013) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 20/05/2013.
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.
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