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White-breasted Antbird Rhegmatorhina hoffmannsi

Justification

Based on a model of future deforestation in the Amazon basin, it is suspected that the population of this species will decline by 25-30% over the next three generations, and it has therefore been uplisted to Near Threatened.

Taxonomic source(s)
SACC. 2006. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.html#.

Identification
14-15cm, 28-34g. Large bare periorbital patch, ear coverts, breast sides, breast and throat all white. Top of head black in male, chestnut brown in female. Upperparts olive-brown, female has buff-edged black tips to coverts, mantle, and rest of underparts while the male is plain, and has grey underparts. Similar spp. Bicoloured Antbird Gymnopithys leucapsis has a similar pattern of white throat and breast, and the nominate has white extending onto face sides. This does not extend across the whole of the ear coverts or the breast sides, both of which are black. The periorbital patch is also smaller than in R. hoffmansi. Voice Loudsong begins with a long slurred whistle followed by 6-7 shorter whistles becoming downslurred and ending with a few lower pitched burry notes. Calls are similar to R. gymnops; a harsh "chirr" and an abrupt "chip".

Distribution and population
This species occurs from the east bank of the rio Madeira south and east through Rondônia to west Mato Grosso on the Serra dos Parecís and Serra das Ararasin in central Amazonian Brazil.

Population justification
The global population size has not been quantified, but this species is described as 'common' (Stotz et al. 1996).

Trend justification
This species is suspected to lose 20.2-24.3% of suitable habitat within its distribution over three generations (14 years) based on a model of Amazonian deforestation (Soares-Filho et al. 2006, Bird et al. 2011). Given the susceptibility of the species to fragmentation and/or edge effects, it is therefore suspected to decline by 25-30% over three generations.

Ecology
The species is found at elevations up to 300 m (Ridgely and Tudor 1994), and is common in undergrowth of tropical lowland evergreen forest. It is considered to be an obligate ant-following species, obtaining virtually all of its prey items from attending primarily Eciton burchelli swarms and seizing arthropods that are flushed by the ants. Breeding is thought to take place during the rainy season, with fledging occurring from February onwards.

Threats
Projected deforestation is the primary threat affecting this species (Soares-Filho et al. 2006, Bird et al. 2011). The species is highly sensitive to human disturbance and is suffering from widespread deforestation, particularly in Mato Grosso and Rondônia, which has increased markedly since the 1960s owing to road building, ranching, smallholder agriculture, mining and hydroelectric development (Cleary 1991, Ridgely and Tudor 1994, Stotz et al. 1996). The principal threats are the expansion of the agricultural frontier as a direct result of highway construction (Cleary 1991) and commercial logging, which is increasingly signficant (M. Cohn-Haft in litt. 1999). Although the rate of highway construction declined in the 1990s, clearance of forest for cattle ranching and other agriculture has continued throughout Rondônia and Mato Grosso, and fragmentation of the remaining forest is likely to further reduce the effective range size of the species.

Conservation Actions Underway

A significant proportion of the range of the species now lies within Protected Areas (A. Lees in litt. 2011), including the Pacaás Novos National Park in Rondônia.

Conservation Actions Proposed

Expand the protected area network to effectively protect IBAs. Effectively resource and manage existing and new protected areas, utilising emerging opportunities to finance protected area management with the joint aims of reducing carbon emissions and maximizing biodiversity conservation. Conservation on private lands, through expanding market pressures for sound land management and preventing forest clearance on lands unsuitable for agriculture, is also essential (Soares-Filho et al. 2006). Campaign against proposed changes to the Brazilian Forest Code that would lead to a decrease in the width of the areas of riverine forest protected as Permanent Preservation Areas (APPs), which function as vital corridors in fragmented landscapes.

References
Bird, J. P.; Buchanan, J. M.; Lees, A. C.; Clay, R. P.; Develey, P. F.; Yépez, I.; Butchart, S. H. M. 2011. Integrating spatially explicit habitat projections into extinction risk assessments: a reassessment of Amazonian avifauna incorporating projected deforestation. Diversity and Distributions: doi: 10.1111/j.1472-4642.2011.00843.x.

Cleary, D. 1991. The Brazilian rainforest: politics, finance, mining and the environment. Economist Intelligence Unit, London.

del Hoyo, J.; Elliott, A.; Christie, D. 2003. Handbook of the Birds of the World, vol. 8: Broadbills to Tapaculos. Lynx Edicions, Barcelona, Spain.

Ridgely, R. S.; Tudor, G. 1994. The birds of South America. University of Texas Press, Austin, Texas.

Soares-Filho, B.S.; Nepstad, D.C.; Curran, L.M.; Cerqueira, G.C.; Garcia, R. A.; Ramos, C. A.; Voll, E.; McDonald, A.; Lefebvre, P.; Schlesinger, P. 2006. Modelling conservation in the Amazon basin. Nature 440(7083): 520-523.

Stotz, D. F.; Fitzpatrick, J. W.; Parker, T. A.; Moskovits, D. K. 1996. Neotropical birds: ecology and conservation. University of Chicago Press, Chicago.

Further web sources of information
Explore HBW Alive for further information on this species

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

Text account compilers
Butchart, S., Ekstrom, J., Fisher, S., Harding, M., Symes, A.

IUCN Red List evaluators
Butchart, S., Taylor, J.

Recommended citation
BirdLife International (2014) Species factsheet: Rhegmatorhina hoffmannsi. Downloaded from http://www.birdlife.org on 27/12/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 27/12/2014.

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.

Key facts
Current IUCN Red List category Near Threatened
Family Thamnophilidae (Antbirds)
Species name author (Hellmayr, 1907)
Population size Unknown mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 646,000 km2
Country endemic? Yes
Links to further information
- Additional Information on this species