EN
Nendo Shrikebill Clytorhynchus sanctaecrucis



Taxonomy

Taxonomic note

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.
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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- B1ab(ii,iii,v); C2a(ii) B1ab(ii,iii,v); C2a(i,ii); D1

Red List history
Year Category Criteria
2016 Endangered B1ab(ii,iii,v); C2a(ii)
2012 Endangered B1ab(ii,iii,v);C2a(ii)
2008 Endangered B1a+b(ii,iii); C2a(ii)
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) 670 medium
Number of locations 1 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 250-999 medium estimated 2016
Population trend Decreasing poor suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 1-19 - - -
Decline (10 years/3 generation past and future) 1-19 - - -
Number of subpopulations 1 - - -
Percentage in largest subpopulation 100 - - -
Generation length (yrs) 4.2 - - -

Population justification: The species is only currently known from one area, although suspected to occur at over 10 locations across the remaining old-growth forest on Nendo. It appears to be restricted to old-growth forest, in which there are two indications of population density: two pairs along a 10 km transect (Dutson 2006) and 0.4 birds per hour (Pierce 2014). These are similar densities to the similar Black-throated Shrikebill C. nigrogularis in Fiji, which was recorded at an average of 0.1 birds (mostly calling males)/hour in old-growth forest, equating to one pair/km(G. Dutson in litt. 2005). Probably less than half of the EOO of C. santacecrucis (319 km2) is occupied suitable habitat (G. Dutson pers. comm. 2016), suggesting that the total population is probably 250-1,000 mature individuals but possibly <250 mature individuals.

Trend justification: It is suspected to be in declining at a slow to moderate rate owing to ongoing habitat loss and degradation caused mainly by industrial logging and shifting agriculture. An analysis of global forest cover data suggests that forest is being lost in the species range at 1.2% over three generations (Tracewski et al. 2016).


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Solomon Islands N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Solomon Islands Nendö

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Altitude 0 - 500 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Small-holder farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
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 - Rattus rattus Timing Scope Severity Impact
Ongoing Unknown Unknown Unknown
Stresses
Reduced reproductive success

Recommended citation
BirdLife International (2022) Species factsheet: Clytorhynchus sanctaecrucis. Downloaded from http://www.birdlife.org on 04/10/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 04/10/2022.