VU
Gough Moorhen Gallinula comeri



Taxonomy

Taxonomic note
Gallinula nesiotis and G. comeri (del Hoyo and Collar 2014) were previously lumped as G. nesiotis following Sibley and Monroe (1990, 1993) and Groenenburg et al. (2008, 2009), and before that had been treated as separate species by Collar and Stuart (1985).

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. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - D2

Red List history
Year Category Criteria
2021 Vulnerable D2
2016 Vulnerable D2
2014 Vulnerable D2
2012 Not Recognised
2010 Not Recognised
2008 Vulnerable D2
2006 Vulnerable
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
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) 70 good
Number of locations 1 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 8500 good estimated 1984
Population trend Stable poor suspected -
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 1 - - -
Percentage in largest subpopulation 100 - - -
Generation length (yrs) 3.5 - - -

Population justification: The total population for G. comeri is estimated at 8,500 mature individuals based on 4,250 pairs on Gough during a 1983 survey (Richardson 1984). This is roughly equivalent to 13,000 individuals in total. There were an additional 2,000 pairs on Tristan in c.2017 (Dagleish et al. 2017), however the population on Tristan is introduced, and thus is not countable under IUCN Red List guidelines.

Trend justification: The population is suspected to be stable in the absence of evidence for any declines.
In 1984, the introduced Tristan population was estimated at c.250 pairs and increasing. It is now distributed throughout the island (P. G. Ryan in litt. 2000), and in 2017, the population on Tristan was estimated to be 2,000 pairs.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
St Helena (to UK) N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
St Helena (to UK) Tristan Island
St Helena (to UK) Gough Island

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Grassland Subantarctic suitable resident
Shrubland Subantarctic suitable resident
Wetlands (inland) Permanent Freshwater Marshes/Pools (under 8ha) suitable resident
Wetlands (inland) Permanent Rivers/Streams/Creeks (includes waterfalls) suitable resident
Wetlands (inland) Seasonal/Intermittent Freshwater Marshes/Pools (under 8ha) suitable resident
Altitude 0 - 900 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 Majority (50-90%) Rapid Declines Past Impact
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Felis catus Timing Scope Severity Impact
Past, Unlikely to Return Majority (50-90%) Rapid Declines Past Impact
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Rattus rattus Timing Scope Severity Impact
Future Majority (50-90%) Rapid Declines Low Impact: 5
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Sus domesticus Timing Scope Severity Impact
Past, Unlikely to Return Majority (50-90%) Rapid Declines Past Impact
Stresses
Species mortality

Recommended citation
BirdLife International (2022) Species factsheet: Gallinula comeri. Downloaded from http://www.birdlife.org on 15/08/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 15/08/2022.