VU
Loango Weaver Ploceus subpersonatus



Taxonomy

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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - C2a(i)

Red List history
Year Category Criteria
2021 Vulnerable C2a(i)
2016 Vulnerable C2a(i)
2012 Vulnerable C2a(i)
2008 Vulnerable C2a(i)
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 99,500 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 2300-3500 poor estimated 2000
Population trend Decreasing poor inferred -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 1-10 - - -
Decline (10 years/3 generation past and future) 1-10 - - -
Number of subpopulations 4 - - -
Percentage in largest subpopulation 1-89 - - -

Population justification:

As this species is described as uncommon to rare, taking the lower quartiles of density estimates of eight congeners, including the Southern Masked-weaver Ploceus velatus of 2-3 individuals/sqkm (BirdLife Population Density Spreadsheet; Vernon 1985; Dean 1995; Monadjem 2002), and assuming it inhabits 10% of the forest within its range (17,300 sqkm [Global Forest Watch 2021]), the population is estimated to fall in the band 3,460-5,190 individuals. This is roughly equivalent to 2,306-3,460 mature individuals rounded here to 2,300-3,500 mature individuals. 

Trend justification: This species is inferred to be declining due to the ongoing loss and degradation of its mangrove and forest habitats (Okanga-Guay et al. 2019; Global Forest Watch 2021). Between 2000-2019, this species experienced forest cover loss of 5.3% (Global Forest Watch 2021), which equates to a rate of loss of 2.8% over 10 years. Adjonina et al. (2014) report that during the last 2 decades prior to 2014, mangroves in West and Central Africa were degraded or reduced by 20-30% due to pollution and over-exploitation. Assuming that this is still occurring at the same rate, the rate of decline may be 10-16% over 10 years. This species is not entirely dependent on mangrove forests, so the past rate of decline is suspected to fall in the band of 1-19%. Between 2016-2019, this species experienced forest cover loss of 1.6% throughout its range (Global Forest Watch 2021). This would equate to a loss of 4% when projected forward 10 years from 2016. The suspected future decline is therefore placed in the 1-10% band.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Angola N Extant Yes
Congo N Extant Yes
Congo, The Democratic Republic of the N Extant Yes
Gabon N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Congo Lower Kouilou basin
Gabon Gamba Protected Areas Complex
Gabon Akanda
Gabon Ogooué delta and Mandji island
Angola Maiombe

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Dry suitable resident
Forest Subtropical/Tropical Mangrove Vegetation Above High Tide Level major resident
Forest Subtropical/Tropical Swamp major resident
Savanna Dry suitable resident
Shrubland Subtropical/Tropical Dry suitable resident
Altitude   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 degradation, Ecosystem conversion
Natural system modifications Other ecosystem modifications Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation
Pollution Domestic & urban waste water - Type Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation
Pollution Industrial & military effluents - Oil spills Timing Scope Severity Impact
Future Minority (<50%) Slow, Significant Declines Low Impact: 3
Stresses
Ecosystem degradation, Species mortality

Recommended citation
BirdLife International (2022) Species factsheet: Ploceus subpersonatus. Downloaded from http://www.birdlife.org on 24/01/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 24/01/2022.