IUCN Red List Criteria
| Critically Endangered |
|
| Endangered |
|
| Vulnerable |
B2ab(iii,v);C2a(ii) |
IUCN Red List history
| Year |
Category |
| 2012 |
Vulnerable |
| 2010 |
Vulnerable |
| 2008 |
Vulnerable |
| 2007 |
Vulnerable |
| 2005 |
Vulnerable |
| 2004 |
Vulnerable |
| 2000 |
Vulnerable |
| 1994 |
Lower Risk/Near Threatened |
| 1988 |
Near Threatened |
Species attributes
| Migratory status |
not a migrant |
Forest dependency |
Does not normally occur in forest |
| Land mass type |
shelf island
|
Average mass |
- |
Population & trend
| |
Estimate |
Data quality |
Derivation |
Year of estimate |
| No. of mature individuals |
6000-10000 |
medium |
Estimated |
2007 |
| Population trend |
Decreasing |
poor |
|
- |
| Number of subpopulations |
1 |
- |
- |
- |
| Largest subpopulation |
6000-10000 |
- |
- |
- |
| Generation length (yrs) |
12.1 |
- |
- |
- |
|
Population justification: The population is estimated to number 9,000-15,000 individuals, roughly equating to 6,000-10,000 mature individuals. |
|
Trend justification: Population declines are suspected owing to the various threats acting on all populations. |
Country/Territory distribution
| Country/Territory |
Occurrence status |
Extinct |
Breeding |
Non-breeding |
Passage |
| Mexico |
Native |
No |
Yes |
|
|
| USA |
Native |
No |
|
Yes |
|
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 |
major |
resident |
| Marine Neritic |
Pelagic |
marginal |
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 |
non-breeding |
|
Altitude
|
0 - 50 m
|
Occasional altitudinal limits
|
|
Threats & impact
| Threat (level 1) |
Threat (level 2) |
Impact and Stresses |
| Biological resource use |
Fishing & harvesting aquatic resources / Unintentional effects: (large scale) |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Slow, Significant Decline |
Medium Impact: |
| Stresses |
|---|
| Species mortality |
|
| Human intrusions & disturbance |
Recreational activities |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Slow, Significant Decline |
Medium Impact: |
| Stresses |
|---|
| Species disturbance, Ecosystem degradation, Ecosystem conversion |
|
| Invasive non-native/alien species/diseases |
Invasive non-native/alien species/diseases / Black Rat (Rattus rattus) |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Rapid Declines |
Medium Impact: |
| Stresses |
|---|
| Reduced reproductive success, Species mortality |
|
| Invasive non-native/alien species/diseases |
Invasive non-native/alien species/diseases / Domestic Cat (Felis catus) |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Rapid Declines |
Medium Impact: |
| Stresses |
|---|
| Reduced reproductive success, Species mortality |
|
| Invasive non-native/alien species/diseases |
Invasive non-native/alien species/diseases / North American Deermouse (Peromyscus maniculatus) |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Rapid Declines |
Medium Impact: |
| Stresses |
|---|
| Reduced reproductive success |
|
| Pollution |
Agricultural & forestry effluents / Herbicides and pesticides |
Timing |
Scope |
Severity |
Impact |
| Past, Unlikely to Return |
Majority (50-90%) |
Unknown |
Past Impact |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion |
|
| Pollution |
Industrial & military effluents / Oil spills |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Slow, Significant Decline |
Medium Impact: |
| Stresses |
|---|
| Species mortality |
|
Utilisation
| Purpose |
Primary form used |
Life stage used |
Source |
Scale |
Level |
Timing |
| Food (human) |
Whole |
Adults and juveniles |
Wild |
Subsistence, National |
Non-trivial |
Recent |
Recommended citation
BirdLife International (2013) Species factsheet: Synthliboramphus craveri. Downloaded from
http://www.birdlife.org on 21/05/2013.
Recommended citation for factsheets for more than one species: BirdLife International (2013) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 21/05/2013.
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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