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

Taxonomic note

Hypsipetes siquijorensis (del Hoyo and Collar 2016) was previously listed as Ixos siquijorensis.

 

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
-	A3c+4c	A2c+3c+4c; C2a(i)

Red List history

Year	Category	Criteria
2017	Endangered	A3c+4c
2016	Endangered	A3c+4c;B1ab(i,ii,iii,iv,v)
2012	Endangered	A3c+4c;B1ab(i,ii,iii,iv,v)
2008	Endangered	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	medium
Land-mass type	shelf island	Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	40,100 km2	medium
Number of locations	2-5	-
Severely fragmented?	yes	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	2500-9999 mature individuals	poor	estimated	1999
Population trend	decreasing	poor	suspected	2011-2022
Rate of change over the past 10 years/3 generations (longer of the two periods)	30-49%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	50-79%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	50-79%	-	-	-
Generation length	3.5 years	-	-	-
Number of subpopulations	2-100	-	-	-

Population justification: The population is estimated to number 2,500-9,999 mature individuals, based on information in BirdLife International (2001). This estimate equates to 3,750-14,999 individuals, rounded here to 3,500-15,000 individuals.

Trend justification: The species may currently be beneftting from forest regeneration on Siquijor, where it lacks competition from other bulbul species (D. Allen in litt. 2012), but rapid habitat loss through logging and conversion to agriculture continues throughout the species's range, suggesting that rapid population declines have taken place, and that these may increase in severity.

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

Country/Territory	IBA Name
Philippines	Balogo Watershed
Philippines	Central Cebu (including Tabunan)
Philippines	Mount Bandila-an

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Subtropical/Tropical Heavily Degraded Former Forest	suitable	resident
Forest	Subtropical/Tropical Moist Lowland	major	resident
Shrubland	Subtropical/Tropical Moist	suitable	resident
Altitude		Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Scale Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Scale Unknown/Unrecorded	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%)		Very Rapid Declines		High Impact: 8
		Stresses Ecosystem degradation, Ecosystem conversion
Invasive and other problematic species, genes & diseases	Problematic native species/diseases - Hypsipetes philippinus	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible declines		Low Impact: 5
		Stresses Competition
Invasive and other problematic species, genes & diseases	Problematic native species/diseases - Pycnonotus goiavier	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible declines		Low Impact: 5
		Stresses Competition

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Recommended citation
BirdLife International (2024) Species factsheet: Streak-breasted Bulbul Hypsipetes siquijorensis. Downloaded from https://datazone.birdlife.org/species/factsheet/streak-breasted-bulbul-hypsipetes-siquijorensis on 23/12/2024.
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 23/12/2024.