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Chatham Oystercatcher Haematopus chathamensis

IUCN Red List Criteria

Critically Endangered  
Endangered
Vulnerable D1+2 

IUCN Red List history

Year Category
2012 Endangered
2008 Endangered
2006 Endangered
2004 Endangered
2000 Endangered
1994 Endangered
1988 Threatened

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) 24 medium
Area of Occupancy breeding/resident (km2) 24 medium
Number of locations 1 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 50-249 good Estimated 2008
Population trend Increasing medium -
Number of subpopulations 1 - - -
Largest subpopulation 200-249 - - -
Generation length (yrs) 13.7 - - -
Population justification: In 2004, a minimum of 266 birds were counted on most of the coast of four islands in the Chathams group, represented a population of 310-325 birds. By 2006 this had risen to 310-360 individuals. However, the number of mature individuals in breeding pairs remains below 250, and so the population is placed in the band 50-249 mature individuals.
Trend justification: In 1998, a census indicated 140-150 birds, representing a significant increase since 1987-1988. In 2004, a minimum of 266 birds were counted on most of the coast of four islands in the Chathams group, representing a population of 310-340 birds (Moore 2005, 2007). The population appears to have levelled off, having reached over 100 pairs and 310-360 individuals in total in 2006 (Moore 2008). The population, therefore, is estimated to have remained fairly stable over the last 10 years, having increased very rapidly in the 10 preceding years.

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
New Zealand Native Extant       Yes

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Marine Intertidal Rocky Shoreline major resident
Marine Intertidal Sandy Shoreline and/or Beaches, Sand Bars, Spits, Etc suitable resident
Marine Intertidal Shingle and/or Pebble Shoreline and/or Beaches suitable resident
Marine Intertidal Tidepools major resident
Altitude 0 - 0 m Occasional altitudinal limits  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Hunting & trapping terrestrial animals / Intentional use (species is the target) Timing Scope Severity Impact
Past, Unlikely to Return Minority (<50%) Unknown Past Impact
Stresses
Species mortality
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Future Whole (>90%) Unknown Unknown
Stresses
Indirect ecosystem effects, Ecosystem degradation
Climate change & severe weather Storms & flooding Timing Scope Severity Impact
Past, Likely to Return Majority (50-90%) Negligible declines Past Impact
Stresses
Ecosystem degradation
Human intrusions & disturbance Work & other activities Timing Scope Severity Impact
Ongoing Majority (50-90%) No decline Low Impact: 5
Stresses
Species disturbance
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Black Rat (Rattus rattus) Timing Scope Severity Impact
Ongoing Majority (50-90%) No decline Low Impact: 5
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Brown Rat (Rattus norvegicus) Timing Scope Severity Impact
Ongoing Majority (50-90%) No decline Low Impact: 5
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Domestic Cat (Felis catus) Timing Scope Severity Impact
Ongoing Minority (<50%) No decline Low Impact: 4
Stresses
Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Domestic Cow (Bos taurus) Timing Scope Severity Impact
Ongoing Minority (<50%) No decline Low Impact: 4
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Domestic Sheep (Ovis aries) Timing Scope Severity Impact
Ongoing Minority (<50%) No decline Low Impact: 4
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Marram Grass (Ammophila arenaria) Timing Scope Severity Impact
Ongoing Minority (<50%) No decline Low Impact: 4
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Problematic native species/diseases Timing Scope Severity Impact
Ongoing Majority (50-90%) No decline Low Impact: 5
Stresses
Species mortality

Recommended citation
BirdLife International (2014) Species factsheet: Haematopus chathamensis. Downloaded from http://www.birdlife.org on 18/12/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 18/12/2014.

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 Endangered
Family Haematopodidae (Oystercatchers)
Species name author Hartert, 1927
Population size 50-249 mature individuals
Population trend Increasing
Distribution size (breeding/resident) 24 km2
Country endemic? Yes
Links to further information
- Summary information on this species