NT
Naung Mung Wren-babbler Napothera naungmungensis



Taxonomy

Taxonomic note

Previously placed in genus Rimator (del Hoyo and Collar 2016) but moved to current genus following Cai et al. (2019). N. danjoui and N. naungmungensis were previously lumped as Jabouilleia danjoui following Sibley & Monroe (1990, 1993).

Given species rank in original description (Rappole et al. 2005) but treated as subspecies in HBW owing in part to mistaken claim of morphometric differences (Collar & Pilgrim 2007, Collar 2011); however, single recording reveals a song or call very different from any recording of N. danjoui, involving a much higher maximum frequency (3), a rising whistle (pitch change 3) and shorter note length (ns1), and this, combined with darker overall colour (1), stronger-marked moustachial and malar lines (1) and faint soft-edged ochreish vs well-defined brown-streaked breastband (2), returns the form provisionally to species rank (this may be forfeit if more recordings reveal that call or song scored above is shared by N. danjoui). Monotypic.

Taxonomic source(s)
Handbook of the Birds of the World and BirdLife International. 2021. Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world. Version 6. Available at: http://datazone.birdlife.org/userfiles/file/Species/Taxonomy/HBW-BirdLife_Checklist_v6_Dec21.zip.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - D1

Red List history
Year Category Criteria
2021 Near Threatened D1
2016 Vulnerable C2a(ii)
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) 4,800 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 500-2500 poor suspected 2016
Population trend Stable 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) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations 1 - - -
Percentage in largest subpopulation 100 - - -

Population justification: The species is thought to be largely restricted to the Naung Mung area, but recently it has been reported from Dehong, in Yunnan (China) (Liu & Chen 2021 per D. L. Yong in litt. 2021). Consequently the population size is even less certain than previously, when the very small and patchy occurrence indicated that it was likely to be very small. It remains possible that there are fewer than 1,000 mature individuals, given the patchiness but it is now more plausible that the population is considerably larger. Given the level of uncertainty over population size, it is best placed in a wide range, and is here considered only that it is most likely to fall between 500-2,500 mature individuals. Further area-based sampling in different areas in the range is needed to refine the population estimate.

Trend justification: Forest loss was previously thought to be significant in this region, but recent remote-sensing forest cover loss estimates indicate there has been less than 1% lost over the past 10 years (Tracewski et al. 2016, Global Forest Watch 2020). No other threats are known: it is not believed to be trapped. The highly restricted range may expose it to impacts of climate change, though these have not been evaluated for the species as yet. In the absence of any clear threats the species's population trend is considered most likely to be stable.


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

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

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Forest Subtropical/Tropical Moist Montane major resident
Altitude 50 - 2100 m 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 Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Negligible declines Low Impact: 5
Stresses
Ecosystem degradation
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Negligible declines Low Impact: 5
Stresses
Ecosystem degradation

Recommended citation
BirdLife International (2023) Species factsheet: Napothera naungmungensis. Downloaded from http://www.birdlife.org on 29/01/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 29/01/2023.