• 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. 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.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	C2a(i)

Red List history

Year	Category	Criteria
2020	Vulnerable	C2a(i)
2016	Endangered	A2c+3c+4c;B1ab(i,ii,iii,iv,v);C2a(ii)
2013	Endangered	A2c+3c+4c;B1ab(i,ii,iii,iv,v);C2a(ii)
2012	Endangered	A2c+3c+4c;B1ab(i,ii,iii,iv,v);C2a(ii)
2008	Endangered	A2c; A3c; A4c; B1a+b(i,ii,iii,iv,v)
2004	Endangered
2000	Endangered
1996	Endangered
1994	Endangered
1988	Threatened

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	28,500 km2	medium
Severely fragmented?	yes	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	1000-2700 mature individuals	poor	inferred	2020
Population trend	decreasing	poor	inferred	2014-2024
Rate of change over the past 10 years/3 generations (longer of the two periods)	20-29%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	20-29%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	20-29%	-	-	-
Generation length	2 years	-	-	-
Number of subpopulations	2-5	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: Based on estimated population densities of 0.9-1.8 individuals/km², the population was conservatively thought to number a maximum of 2,000-4,000 individuals, roughly converted to 1,250-2,750 mature individuals (Ágreda 2020). Albeit, considering that this may be overestimated, the population could number as low as 1,000-3,000 individuals, equating to 625-2,060 mature individuals (J. Freile in litt. 2020). Further information suggests that the population may number at c. 500-1,800 individuals, possibly reaching up to 2,000 individuals with any number of subpopulation unlikely to exceed 1,000 mature individuals (H. M. Schaefer in litt. 2020). Based on high levels of uncertainty and best available information therefore, the population has been placed in the band of 1,000-2,700 mature individuals, roughly equating to 1,600-3,900 individuals. The population is further thought to exist in at least 4-5 subpopulations at Jama, Pacoche, Cantagallo-Ayampe, Loma Alta and San Francisco-Galerita (M. Moens in litt. 2020). However, the Chongon Colonche mountain range may equally represent only one single subpopulation (J. Freile in litt. 2020). Thus, it is tentatively assumed that there are 2-5 subpopulations within the species's range.

Trend justification: The population trend has not been estimated directly. Whilst reduction was previously estimated to be greater than 50% over a ten year period (Harris et al. 2009), given that habitat loss and degradation are the primary threats, recent forest loss estimates (per Global Forest Watch 2020) show that this is now marginal at <5% in three generations (10 years; Bird et al. 2020). However, although the species is known to tolerate some degree of degraded and converted habitats, taking into account past decline rates and the combined effects of forest loss and degradation with climatic events, it is inferred that the population is undergoing a continued decline of 20-29% over three generations.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Ecuador	extant	native	yes

Country/Territory	IBA Name
Ecuador	Isla de la Plata
Ecuador	Parque Nacional Machalilla y alrededores
Ecuador	Reserva Ecológica Comunal Loma Alta

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Subtropical/Tropical Heavily Degraded Former Forest	major	resident
Forest	Subtropical/Tropical Moist Lowland	major	resident
Altitude	50 - 350 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 - 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		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation
Climate change & severe weather	Storms & flooding	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Species disturbance, Ecosystem degradation
Invasive and other problematic species, genes & diseases	Problematic species/disease of unknown origin - Unspecified species	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Causing/Could cause fluctuations		Low Impact: 5
		Stresses Species mortality
Natural system modifications	Fire & fire suppression - Increase in fire frequency/intensity	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation
Residential & commercial development	Housing & urban areas	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Causing/Could cause fluctuations		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

Purpose	Scale
Pets/display animals, horticulture	international

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Recommended citation
BirdLife International (2024) Species factsheet: Esmeraldas Woodstar Chaetocercus berlepschi. Downloaded from https://datazone.birdlife.org/species/factsheet/esmeraldas-woodstar-chaetocercus-berlepschi on 22/12/2024.
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 22/12/2024.