• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	A2c+3c+4c; B1ab(i,ii,iii,v)	A2c+3c+4c; B1ab(i,ii,iii,v); C1+2a(i); D2

Red List history

Year	Category	Criteria
2020	Endangered	A2c+3c+4c; B1ab(i,ii,iii,v)
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

Migratory status	not a migrant	Forest dependency	medium
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	470 km2	medium
Number of locations	3	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	1300-1400 mature individuals	good	estimated	2016
Population trend	decreasing	poor	estimated	2011-2025
Rate of change over the past 10 years/3 generations (longer of the two periods)	58%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	52-66%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	59%	-	-	-
Generation length	4.4 years	-	-	-
Number of subpopulations	3	-	-	-

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 the following 15 years, which equates to a ~52-66% decline over three generations (13.2 years). 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	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Martinique (to France)	extant	native	yes
St Lucia	extant	native	yes

Country/Territory	IBA Name
Martinique (to France)	Presqu'île de la Caravelle
St Lucia	Iyanola and Grande Anses, Esperance and Fond D'ors
St Lucia	Mandelé Protected Landscape

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

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

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Recommended citation
BirdLife International (2024) Species factsheet: White-breasted Thrasher Ramphocinclus brachyurus. Downloaded from https://datazone.birdlife.org/species/factsheet/white-breasted-thrasher-ramphocinclus-brachyurus on 24/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 24/12/2024.