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Black-throated Shrikebill Clytorhynchus nigrogularis

IUCN Red List Criteria

Critically Endangered  
Endangered  
Vulnerable C1 

IUCN Red List history

Year Category
2012 Vulnerable
2008 Vulnerable
2004 Not Recognised
2000 Not Recognised
1994 Not Recognised
1988 Not Recognised

Species attributes

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

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 16,900 medium
Number of locations -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 2500-9999 medium Estimated 2005
Population trend Decreasing poor -
Number of subpopulations - - -
Largest subpopulation - - -
Generation length (yrs) 4.2 - - -
Population justification: Recent surveys on Fiji recorded an average of 0.1 birds/hour (a total of 49 birds) equating to 1 bird/km2, mostly calling males. There are a number of likely errors in this estimate, especially the number of silent birds overlooked. 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 it assumed to occur in 50% of the forest, which covers about 40% of the species's Fijian EOO (c.17,500 km2), the total population is likely to be in the range of 2,500-9,999 birds (G. Dutson in litt. 2005). This equates to 3,750-14,999 individuals, rounded here to 3,500-15,000 individuals.
Trend justification: Given the species's intolerance of habitat degradation, it is likely to be declining at the same rate as forest loss and degradation, which is estimated to be about 0.5-0.8% per year (Claasen 1991), equating to 6-10% over 12 years (three generations).

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Fiji Native Extant       Yes

Important Bird Areas where this species has triggered the IBA criteria

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

Habitats & altitude

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

Threats & impact

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 Decline 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 Decline Low Impact: 5
Stresses
Ecosystem degradation

Recommended citation
BirdLife International (2014) Species factsheet: Clytorhynchus nigrogularis. Downloaded from http://www.birdlife.org on 23/09/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 23/09/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Vulnerable
Family Monarchidae (Monarchs)
Species name author (Layard, 1875)
Population size 2500-9999 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 16,900 km2
Country endemic? Yes
Links to further information
- Summary information on this species