VU
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)

Red List history
Year Category Criteria
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 -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 649,000 medium
Number of locations 11-100 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 2500-9999 poor estimated 2000
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) 30-49 - - -
Decline (10 years/3 generation past and future) 30-49 - - -
Number of subpopulations 2-100 - - -
Largest subpopulations - - -
Generation length (yrs) 4 - - -

Population justification: The population is estimated to number 2,500-9,999 mature individuals, based on an analysis of records in BirdLife International (2001) suggesting that the population is unlikely to exceed 10,000 individuals, but may fall short of this. This equates to approximately 3,750-14,999 individuals in total, rounded here to 3,500-15,000 individuals. However, it has also been suggested that the total population could number fewer than 3,000 mature individuals (R. Bhargava per A. Rahmani in litt. 2012).

Trend justification: A rapid and on-going population decline is suspected to be occurring, owing to the conversion of terai habitats for agriculture, as well as the effects of trapping for the cage-bird trade. The recent disappearance of colonies from previously occupied sites supports this projected trend. However, the population trend differs considerably between the two populations. The western population (Delhi, Uttar Pradesh, Uttarakhand, eastern Nepal) seems to be in a rapid decline, as industrial activities within the area have resulted in a loss of grassland habitat (P. M. Laad in litt. 2016). While in 1961, 800 nests were discovered in Uttarakhand, in 2012 only 11 nests could be located (Bhargava 2017). However, the eastern population in Nepal, though historically much smaller, is increasing rapidly: In the Shuklaphanta National Park, the population increased from 11 birds in 1996 and is currently estimated at around 300 individuals (Bhargava 2017). The trend of the southern population (West Bengal) is not clear: In 2008 and 2009, the species had been seen in some locations, but no surveys have been carried out recently. However, there appears to be suitable habitat in the area (Bhargava 2017).


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%) Rapid Declines Medium Impact: 7
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%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Wood & pulp plantations - Agro-industry plantations Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
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 (2020) Species factsheet: Ploceus megarhynchus. Downloaded from http://www.birdlife.org on 13/08/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 13/08/2020.