EN
White-breasted Thrasher Ramphocinclus brachyurus



Taxonomy

Taxonomic source(s)
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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- A2c+3c+4c; B1ab(i,ii,iii,v) A2c+3c+4c; B1ab(i,ii,iii,v); C2a(i); D2

Red List history
Year Category Criteria
2018 Endangered A2c+3c+4c; B1ab(i,ii,iii,v)
2016 Endangered A2c+3c; B1ab(i,ii,iii,v)
2015 Endangered B1ab(i,ii,iii,v)
2012 Endangered B1ab(i,ii,iii,v)
2008 Endangered B1a+b(i,ii,iii,v)
2006 Endangered
2005 Endangered
2004 Endangered
2000 Endangered
1996 Endangered
1994 Endangered
1988 Threatened
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) 470 medium
Number of locations 3 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 1300-1400 good estimated 2016
Population trend Decreasing 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) 57-75 - - -
Decline (10 years/3 generation past and future) 59 - - -
Number of subpopulations 3 - - -
Largest subpopulations - - -
Generation length (yrs) 4.9 - - -

Population justification: The population is estimated to number 200-400 individuals on Martinique (Temple 2005, AOMA 2008) (equivalent to 133-267 mature individuals) and 1,130 mature individuals on St Lucia (1,030 in Mandelé and 100 in Iyanola [M. Morton in litt. 2016]), giving a range of 1,293-1,397 mature individuals, rounded here to 1,300-1,400 mature individuals.

Trend justification: Recently, the rate of decline increased owing to the construction of a hotel resort that destroyed the habitat of 25% of the global population. Moderately rapid to rapid declines are therefore estimated. The largest subpopulation (on St Lucia) may be undergoing an even more rapid decline (M. Morton in litt. 2012), having decreased by 56% from 1,766 individuals in 2006 to 760 in 2011 (Morton 2012). Projecting the observed decline in this subpopulation into the future (up to 2024) suggests that the population could decline by 80% in less than ten years (Felix et al. 2014). A study modelled the Mandelé subpopulation on St Lucia (c.84% of the total population) and estimated a reduction in the number of birds from 1,637 to 1,440 between 2007 and 2015 (Morton et al. 2016). It also predicted a decline of 85% of this subpopulation and of 57-71% in the global population across 15 years (three generations). These predictions do not take into account the potential continuation of development at the hotel resort or the planned adjacent wind farm, or recently increased threats from timber extraction and feral pigs; so actual declines may be greater than those projected.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Martinique (to France) Presqu'île de la Caravelle
St Lucia Mandele Dry Forest
St Lucia North-east coast

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Dry major resident
Shrubland Subtropical/Tropical Dry major resident
Altitude 0 - 200 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Agro-industry farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops - Shifting agriculture Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops - Small-holder farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
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, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation
Climate change & severe weather Storms & flooding Timing Scope Severity Impact
Ongoing Whole (>90%) Causing/Could cause fluctuations Medium Impact: 7
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Didelphis marsupialis Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Felis catus Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Herpestes auropunctatus Timing Scope Severity Impact
Ongoing Whole (>90%) Slow, Significant Declines Medium Impact: 7
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Herpestes javanicus Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Named species Timing Scope Severity Impact
Ongoing Whole (>90%) Slow, Significant Declines Medium Impact: 7
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Sus scrofa Timing Scope Severity Impact
Ongoing Unknown Unknown Unknown
Stresses
Ecosystem degradation
Pollution Agricultural & forestry effluents - Type Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation
Residential & commercial development Tourism & recreation areas Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation, Ecosystem conversion
Transportation & service corridors Roads & railroads Timing Scope Severity Impact
Future Majority (50-90%) Rapid Declines Low Impact: 5
Stresses
Species disturbance, Ecosystem conversion

Recommended citation
BirdLife International (2019) Species factsheet: Ramphocinclus brachyurus. Downloaded from http://www.birdlife.org on 15/10/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 15/10/2019.