VU
Forest Thrush Turdus lherminieri



Taxonomy

Taxonomic note

Taxonomic source(s)
AOU. 1998. Check-list of North American birds. American Ornithologists' Union, Washington, D.C.
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.
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.
Stotz, D. F.; Fitzpatrick, J. W.; Parker, T. A.; Moskovits, D. K. 1996. Neotropical birds: ecology and conservation. University of Chicago Press, Chicago.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - A2cde

Red List history
Year Category Criteria
2016 Vulnerable A2cde
2012 Vulnerable A2cde+4cde
2008 Vulnerable A2c,d,e
2004 Vulnerable
2000 Vulnerable
1994 Lower Risk/Near Threatened
1988 Lower Risk/Least Concern
Species attributes

Migratory status not a migrant Forest dependency High
Land mass type Average mass 105 g
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 12,000 medium
Number of locations 11-100 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 2500-9999 poor estimated 2016
Population trend Unknown 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) 0 - - -
Decline (10 years/3 generation past and future) 0 - - -
Number of subpopulations 4 - - -
Largest subpopulations - - -
Generation length (yrs) 4.4 - - -

Population justification: Young (2008) estimated a population of 3,100 individuals on Montserrat, and Eraud et al. (2012) estimated 46,000 - 49,000 breeding pairs on Guadeloupe alone. However, both estimates were based on distance sampling which can be highly inaccurate in dense tropical forests given that most Forest Thrush detections are aural. On Montserrat there were 1174 individuals (95% credible interval 624-2178) at the 88 point count stations monitored in the Centre Hills in 2016. These point count stations cover only 20-40% of the available forest habitat (Oppel et al. 2014), hence the population on Montserrat could be between 1,500 - 10,000 individuals.

Trend justification: There are no new data on population trends; however, the species is suspected to be declining, although following the cessation of volcanic activity on Montserrat, not as fast as previously.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Dominica N Extant Yes
Guadeloupe (to France) N Extant Yes
Montserrat (to UK) N Extant Yes
St Lucia N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Dominica Morne Diablotin National Park
Dominica Morne Trois Pitons National Park
Guadeloupe (to France) Forestry massif of Basse-Terre island
Guadeloupe (to France) Grand Cul-de-Sac Marin's eastern coastline
Montserrat (to UK) Centre Hills
Montserrat (to UK) Northern Forested Ghauts
Montserrat (to UK) South Soufriere Hills
St Lucia Government Forest Reserve

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Montane major resident
Altitude 0 - 1400 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Hunting & trapping terrestrial animals Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species mortality
Biological resource use Logging & wood harvesting Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation
Geological events Volcanoes Timing Scope Severity Impact
Past, Likely to Return Minority (<50%) Rapid Declines Past Impact
Stresses
Ecosystem degradation, Ecosystem conversion
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Problematic native species/diseases Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Competition

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Food (human) Whole Adults and juveniles Wild Non-trivial Recent

Recommended citation
BirdLife International (2017) Species factsheet: Turdus lherminieri. Downloaded from http://www.birdlife.org on 25/11/2017. Recommended citation for factsheets for more than one species: BirdLife International (2017) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 25/11/2017.