EN
Finn's Weaver Ploceus megarhynchus



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
- A2cd+3cd+4cd; C2a(i) A2cd+3cd+4cd; C2a(i); D1

Red List history
Year Category Criteria
2021 Endangered A2cd+3cd+4cd; C2a(i)
2018 Vulnerable A2cd+3cd+4cd;C2a(i)
2016 Vulnerable A2cd+3cd+4cd;C2a(i)
2012 Vulnerable A2cd+3cd+4cd;C2a(i)
2008 Vulnerable A2c,d; A3c,d; A4c,d; C2a(i)
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened
Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type Land-mass type - continent
Average mass -
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 649,000 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 250-999 medium estimated 2017
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) 50-79 - - -
Decline (10 years/3 generation past and future) 50-79 - - -
Number of subpopulations 3 - - -
Percentage in largest subpopulation 1-89 - - -
Generation length (yrs) 3.45 - - -

Population justification: Based on surveys conducted by Bhargava (2017) maximum numbers were fewer than 200 in Uttarakhand and Uttar Pradesh together, and fewer than 300 in north-east India. However, the study also reported rapid declines in Uttarakhand and Uttar Pradesh, suggesting this number may be even lower today. The population in the Nepalese stronghold has been most recently counted as 254 individuals, following an expanded survey effort (Bird Conservation Nepal 2020), but nesting surveys in 2020 showed a continuing decline in the number of active nests and breeding birds, with 66 nests in 2020 down from 115 in 2019, and 133 birds down from 177 (Poudyal et al. 2020). Overall, the number of mature individuals is considered most likely to be 210–300 mature individuals in the western population and 200–250 in the eastern population. There may be a small number remaining in the disjunct West Bengal population, however there are few recent records from this area (Bhargava et al. 2017). The population is therefore suspected to fall in the band of 410–600 mature individuals, and estimated to lie within a wider band of 250–999 mature individuals, with no subpopulation larger than 250 mature individuals.

Trend justification: The population is inferred to be declining owing to the conversion of terai habitats for agriculture and industrial development as well as the effects of trapping for the cage-bird trade (Bhargava 2017). 

The rate of this decline is suspected to be severe. The most well-studied area, Udham Singh Nagar in Uttarakhan, showed a reduction from 220 to 35 individuals between 2002-2017. This decline of 84% over 15 years is equivalent to a rate of decline of 72% over three generations (10.5 years [Bird et al. 2020]). Declines have also been noted in the species's Nepalese stronghold, Shuklaphanta National Park, where the population was previously increasing. The population is estimated to have decreased from 300 individuals in 2017 to 254 individuals in 2021 (Bird Conservation Nepal 2020).

The trend of the southern population (West Bengal) is not clear due to the very small number of recent sightings: In 2008 and 2009, the species had been seen in some locations, but while there appears to be suitable habitat in the area, there has not been a confirmed sighting of this species since 2009 (Bhargava 2017).

Due to the rapid declines in Udham Singh Nagar, and Shuklaphanta National Park, and the reports of its disappearance from other former locations, it is suspected that overall this species is experiencing rapid declines in excess of 50% but most likely below 80% over three generations. Based on the threats, there is no reason to suspect that these rates of reduction will not continue.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
India Dibru - Saikhowa Complex
India Kaziranga National Park
India Manas National Park
India Orang National Park
India Pabitora Wildlife Sanctuary
India Okhla Bird Sanctuary
India Sultanpur National Park
India Hastinapur Wildlife Sanctuary
India Kurra Jheel
India Buxa Tiger Reserve (National Park)
India Jaldapara Wildlife Sanctuary
Nepal Koshi Tappu Wildlife Reserve and Koshi Barrage
Nepal Sukla Phanta Wildlife Reserve
India Manas Reserve Forest

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Arable Land suitable resident
Artificial/Terrestrial Plantations suitable resident
Grassland Subtropical/Tropical Seasonally Wet/Flooded major resident
Altitude   Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Agro-industry farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Very Rapid Declines High Impact: 8
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops - Small-holder farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching - Small-holder grazing, ranching or farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Very Rapid Declines High Impact: 8
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Wood & pulp plantations - Agro-industry plantations Timing Scope Severity Impact
Ongoing Majority (50-90%) Very Rapid Declines High Impact: 8
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Wood & pulp plantations - Small-holder plantations Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Hunting & trapping terrestrial animals - Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Problematic native species/diseases - Corvus macrorhynchos Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases Problematic native species/diseases - Corvus splendens Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Reduced reproductive success, Species mortality
Residential & commercial development Commercial & industrial areas Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem conversion
Residential & commercial development Housing & urban areas Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem conversion
Transportation & service corridors Roads & railroads Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem conversion

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Pets/display animals, horticulture - - Non-trivial Recent

Recommended citation
BirdLife International (2022) Species factsheet: Ploceus megarhynchus. Downloaded from http://www.birdlife.org on 10/12/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 10/12/2022.