LC
Cobb's Wren Troglodytes cobbi



Taxonomy

Taxonomic source(s)
Campagna, L.; St Clair, J. J. H.; Lougheed, S. C.; Woods, R. W.; Imberti, S.; Tubaro, P. L. 2012. Divergence between passerine populations from the Malvinas - Falkland Islands and their continental counterparts: a comparitive phylogeographical study. Biological Journal of the Linnean Society DOI: 10.1111/j.1095-8312.2012.01898.x.
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.
Woods, R. W. 1993. Cobb's Wren Troglodytes (aedon) cobbi of the Falkland Islands. Bulletin of the British Ornithologists' Club 113: 195-207.

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

Red List history
Year Category Criteria
2017 Least Concern
2016 Vulnerable D2
2012 Vulnerable D2
2008 Vulnerable D2
2006 Vulnerable
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Not Recognised
Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type Land-mass type - shelf island
Average mass 19 g
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 29,200 medium
Number of locations 11-100 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 12000 good estimated 2000
Population trend Stable poor 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 2-100 - - -
Largest subpopulations 1-89 - - -
Generation length (yrs) 3.5 - - -

Population justification: An estimate of 9,000-16,000 individuals is given by Woods (2000). In 2008 this estimate had remained unchanged at 9,000-16,000 individuals or 6,000 pairs (12,000 mature individuals).

Trend justification: No new data on population trends have been provided since Woods (2000). This species is assumed to be stable, owing to lack of current direct threats.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Falkland Islands (Malvinas) N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Falkland Islands (Malvinas) Lively Island Group
Falkland Islands (Malvinas) Beauchêne Island
Falkland Islands (Malvinas) Bird Island
Falkland Islands (Malvinas) Hummock Island Group
Falkland Islands (Malvinas) Jason Islands Group
Falkland Islands (Malvinas) Kidney Island Group
Falkland Islands (Malvinas) Lively Island Group
Falkland Islands (Malvinas) New Island Group
Falkland Islands (Malvinas) Passage Islands Group
Falkland Islands (Malvinas) Pebble Island Group
Falkland Islands (Malvinas) Sea Lion Islands Group
Falkland Islands (Malvinas) Speedwell Island Group
Falkland Islands (Malvinas) West Point Island Group

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Grassland Subantarctic major resident
Altitude   Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Livestock farming & ranching - Small-holder grazing, ranching or farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Felis catus Timing Scope Severity Impact
Future Minority (<50%) Slow, Significant Declines Low Impact: 3
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Rattus norvegicus Timing Scope Severity Impact
Future Minority (<50%) Slow, Significant Declines Low Impact: 3
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Rattus rattus Timing Scope Severity Impact
Future Minority (<50%) Slow, Significant Declines Low Impact: 3
Stresses
Reduced reproductive success
Natural system modifications Fire & fire suppression - Increase in fire frequency/intensity Timing Scope Severity Impact
Future Minority (<50%) Slow, Significant Declines Low Impact: 3
Stresses
Ecosystem degradation

Recommended citation
BirdLife International (2020) Species factsheet: Troglodytes cobbi. Downloaded from http://www.birdlife.org on 25/10/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 25/10/2020.