• 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.
Dutson, G. 2006. The Pacific shrikebills (Clytorhynchus) and the case for species status for the form sanctaecrucis. Bulletin of the British Ornithologists' Club 126(4): 299-308.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2022	Near Threatened	C2a(i)
2016	Near Threatened	C1
2015	Near Threatened	C1
2012	Vulnerable	C1
2008	Vulnerable	C1
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	53,200 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	2000-2600 mature individuals	medium	estimated	2022
Population trend	decreasing	poor	inferred	2016-2026
Rate of change over the past 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Generation length	3.7 years	-	-	-
Number of subpopulations	5	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: It has been described as fairly common in suitable habitat, but is likely to be rarer than commonly reported because it is often misidentified and occurs at low population densities (G. Dutson pers. obs. 2000, Watling 2000). Recent surveys have generated more data on this species, showing it to be widespread but at low population densities: approximately 1 bird/km² on average, mostly calling males. There are a number of likely errors in this estimate, especially the number of silent birds overlooked. It is fairly common at the Garrick and Tomaniivi reserves; one or two can be heard most days in the central hills from Nausori Highlands to Nadrau and Monosavu. The species was recorded at 55% of the sites surveyed (19/34 sites) which were pre-selected to be the densest wettest old-growth forest. Very few were recorded in logged or degraded forest. If assumed to occur in 20% of the forest within its range (much of which is unsuitable), the total population is likely to number c.2,000-2,600 mature individuals with c.1,200-1,600 in the largest subpopulation on Viti Levu.

Trend justification: Remote sensing data (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein) indicate that in the three generations to 2021, forest loss in this species' range has been equivalent to c.2-3%, and this may accelerate to an equivalent rate of c.5-6% based on steeper declines recorded in 2021. Given the species' intolerance of habitat degradation, it is likely to be declining at least at the same rate as forest loss and degradation.

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

Country/Territory	IBA Name
Fiji	East Kadavu
Fiji	Greater Tomaniivi
Fiji	Koroyanitu / Vaturu
Fiji	Natewa/Tunuloa Peninsula
Fiji	Rairaimatuku Highlands
Fiji	Sovi Basin
Fiji	Taveuni Highlands
Fiji	Viti Levu Southern Highlands
Fiji	Wailevu/Dreketi Highlands

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Altitude	0 - 1200 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Wood & pulp plantations - Small-holder plantations	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
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Acridotheres tristis	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible declines		Low Impact: 5
		Stresses Species disturbance, Competition
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Unspecified species	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible declines		Low Impact: 5
		Stresses Species disturbance, Ecosystem degradation, Species mortality
Invasive and other problematic species, genes & diseases	Problematic native species/diseases - Pycnonotus cafer	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible declines		Low Impact: 5
		Stresses Species disturbance, Competition

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Recommended citation
BirdLife International (2024) Species factsheet: Black-throated Shrikebill Clytorhynchus nigrogularis. Downloaded from https://datazone.birdlife.org/species/factsheet/black-throated-shrikebill-clytorhynchus-nigrogularis on 23/11/2024.
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 23/11/2024.