Species

Justification
This widespread species is suspected to have declined in many areas as a result of habitat destruction. It is apparently a successful colonist of secondary habitats, suggesting that these declines are likely to be only moderately rapid. It is therefore considered Near Threatened. Should the species be found to be declining less rapidly or to be more tolerant of degraded habitats than currently thought, it would warrant downlisting to a lower threat category.

Taxonomic source(s)
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.

Distribution and population
Stachyris nigricollis occurs in the Sundaic lowlands, from peninsular Thailand, Sabah, Sarawak and Peninsular Malaysia, Singapore (formerly), Kalimantan and Sumatra, Indonesia and Brunei. It is uncommon to fairly common across this range, being most abundant in degraded forests of lowland Borneo.

Population justification
The global population size has not been quantified, but the species is described as generally uncommon to fairly common, although common in Borneo and extinct in Singapore (del Hoyo et al. 2007).

Trend justification
Declines are likely to be occurring in areas in which total forest clearance and fragmentation has occurred.

Ecology
This species occurs in primary and secondary evergreen forest, including freshwater and peatswamp forest, from lowlands up to 1,000 m. Although it is perhaps most abundant in lightly disturbed forests with luxuriant lower-storey growth (e.g. Edwards et al. 2011), evidence from Singapore suggests that it is unable to persist in secondary forest fragments long term (Castelletta et al. 2000). In addition, the species is not found in heavily degraded and disturbed habitats such as degraded peat swamp forest (Posa 2011), plantations and scrub (Peh et al. 2006) or in highly fragmented forest (D. L. Yong in litt. 2012).

Threats
Rates of forest loss in the Sundaic lowlands have been extremely rapid, owing partly to the escalation of illegal logging and land conversion, with deliberate targeting of all remaining stands of valuable timber including those inside protected areas. Forest fires have also had a damaging effect (particularly in 1997-1998). As this species persists in secondary and logged forests, it may not be under immediate threat from selective logging and may be relatively secure in areas where habitat clearance is incomplete, but complete forest clearance (e.g. for plantations and agriculture) remains a real threat.

Conservation actions underway
None is known

Conservation actions proposed
Conduct ecological studies to improve understanding of its precise habitat requirements and response to fragmentation. Monitor population trends and rates of habitat loss across the range. Effectively protect significant areas of suitable forest at key sites, in both strictly protected areas and community-led multiple use areas.

References
BirdLife International. 2001. Threatened birds of Asia: the BirdLife International Red Data Book. BirdLife International, Cambridge, U.K.

Edwards, D.P., Larsen, T.H., Docherty, T.D.S., Ansell, F.A., Hsu, W.W., Derhé, M.A., Hamer, K.C., Wilcove, D.S. 2011. Degraded lands worth protecting: the biological importance of Southeast Asia’s repeatedly logged forests. Proc Biol Sci 278: 82–90.

Castelletta, M., Sodhi, N.S., Subaraj, R. 2000. Heavy extinctions of forest avifauna in Singapore: lessons for biodiversity conservation in Southeast Asia. Conservation Biology 14: 1870–1880.

Posa, M. 2011. Peat swamp forest avifauna of Central Kalimantan, Indonesia: Effects of habitat loss and degradation. Biological Conservation 114(10): 2548-2556.

Peh, K. S. H., Sodhi, N. S., de Jong, J., Sekercioglu, C. H., Yap, C. A. M., and Lim, S. L. H. 2006. Conservation value of degraded habitats for forest birds in southern Peninsular Malaysia. Diversity and Distributions 12(5): 572-581.

Further web sources of information
Detailed species accounts from the Threatened birds of Asia: the BirdLife International Red Data Book (BirdLife International 2001).

Hear sounds for this species from xeno-canto, the community database of shared bird sounds from around the world.

View photos and videos, and hear sounds of this species from the Internet Bird Collection

Text account compilers
Benstead, P., Derhé, M., Gilroy, J., Mahood, S.

Contributors
Duckworth, W., Yong, D.

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2013) Species factsheet: Stachyris nigricollis. Downloaded from http://www.birdlife.org on 19/06/2013. Recommended citation for factsheets for more than one species: BirdLife International (2013) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 19/06/2013.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Additional resources for this species

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