EN
South Island Takahe Porphyrio hochstetteri



Taxonomy

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.
Trewick, S. A. 1996. Morphology and evolution of two Takahe: flightless rails of New Zealand. Journal of Zoology (London) 238: 221-237.
Trewick, S. A. 1996. Morphology and evolution of two Takahe: flightless rails of New Zealand. Journal of Zoology (London) 238: 221-237.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - D1

Red List history
Year Category Criteria
2016 Endangered D
2013 Endangered D
2012 Endangered D
2008 Endangered D1
2006 Endangered
2004 Endangered
2000 Endangered
1996 Endangered
1994 Not Recognised
1988 Not Recognised
Species attributes

Migratory status not a migrant Forest dependency Medium
Land mass type Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 181,000 medium
Number of locations 9 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 280 good estimated 2016
Population trend Stable good estimated -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations 9 - - -
Largest subpopulations 1-89 - - -
Generation length (yrs) 9.8 - - -

Population justification: The total population is currently estimated to number 280 mature birds with approximately 87 breeding pairs (A. Digby in litt. 2016). Th

Trend justification: The mainland population has fluctuated, including a decline of 40% due to predation in 2007/08 (Hegg et al. 2012). Translocated populations have increased slowly (Bunin et al. 1997), but may now be stabilising.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Pastureland major resident
Forest Temperate major non-breeding
Grassland Temperate major resident
Altitude 0 - 1200 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Wood & pulp plantations - Agro-industry plantations Timing Scope Severity Impact
Ongoing Unknown No decline Unknown
Stresses
Ecosystem degradation
Biological resource use Hunting & trapping terrestrial animals - Intentional use (species is the target) Timing Scope Severity Impact
Past, Unlikely to Return Unknown Unknown Past Impact
Stresses
Species mortality
Climate change & severe weather Storms & flooding Timing Scope Severity Impact
Past, Likely to Return Majority (50-90%) Causing/Could cause fluctuations Past Impact
Stresses
Ecosystem degradation
Human intrusions & disturbance Work & other activities Timing Scope Severity Impact
Ongoing Minority (<50%) No decline Low Impact: 4
Stresses
Species disturbance, Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Cervus elaphus_old Timing Scope Severity Impact
Ongoing Majority (50-90%) No decline Low Impact: 5
Stresses
Competition
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Mustela erminea Timing Scope Severity Impact
Ongoing Majority (50-90%) No decline Low Impact: 5
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Trichosurus vulpecula Timing Scope Severity Impact
Ongoing Majority (50-90%) No decline Low Impact: 5
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Problematic native species/diseases Timing Scope Severity Impact
Ongoing Minority (<50%) No decline Low Impact: 4
Stresses
Species mortality

Recommended citation
BirdLife International (2020) Species factsheet: Porphyrio hochstetteri. Downloaded from http://www.birdlife.org on 29/10/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 29/10/2020.