email a friend
printable version
VU
Grey-headed Antbird Myrmeciza griseiceps

Justification
This species has a small and severely fragmented range and population, both of which are declining rapidly as a result of habitat loss and degradation. It is therefore listed as Vulnerable.

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
13.5-14 cm. Principally grey-and-brown antbird with noticeable wing and tail spots. Grey head and neck, with brown back and large white dorsal patch. Black wing-coverts with bold white spotting. Black breast and throat, but otherwise grey underparts. Sexes similar, although female has paler head and neck, reduced dorsal patch, wing and tail spotting, and lacks black on underparts. Voice Song a simple, short, descending trill. Call a nasal, querulous squee-squirt.

Distribution and population
Myrmeciza griseiceps occurs on the Pacific slope of the Andes in south-west Ecuador (El Oro and western Loja) and north-west Peru (Tumbes, Piura,  Lambayeque and Cajamarca [Angulo 2009]). It is rare to locally uncommon (Ridgely and Greenfield 2001, Schulenberg et al. 2007), and overall numbers must be very small.

Population justification
The population is estimated to number 2,500-9,999 mature individuals based on an assessment of known records, descriptions of abundance and range size. This is consistent with recorded population density estimates for congeners or close relatives with a similar body size, and the fact that only a proportion of the estimated Extent of Occurrence is likely to be occupied. This estimate is equivalent to 3,750-14,999 individuals, rounded here to 3,500-15,000 individuals.

Trend justification
This species is showing declines within its known range. Habitat continues to be destroyed at several sites (R. Williams in litt. 2003) with a current rate of forest loss in western Ecuador of 57% per decade. Overall, rapid declines are suspected based on rates of forest loss across the entire range.

Ecology
This poorly-known antbird is confined to Chusquea bamboo and dense undergrowth in semi-deciduous moist forest, cloud-forest and, occasionally, deciduous forest, at 600-2,900 m. In Peru there are records in disturbed and secondary forests (F. Angulo in litt. 2012). It keeps to dense vegetation, rarely above 4 m, where it tends to forage in pairs or family groups, often within mixed-species understorey flocks. In Peru, it occurred at a density of 0.43 pairs per ha with an average territory size of 0.47 ha (Kikuchi 2009). The diet is unrecorded, but it probably takes invertebrates. Its breeding ecology is virtually unknown, although two juveniles were taken in June, suggesting that it nests during the wet season, in January-May. This is supported by observations that it is much more vocal in the early wet season.



Threats
Below 900 m, the rate of deforestation in west Ecuador in 1958-1988 was 57% per decade (Dodson and Gentry 1991). Significant habitat loss is ongoing, at least in unprotected areas, and will soon remove almost all extant lowland forest unless effective action is taken urgently. Intense trampling and grazing by goats and cattle damage the understorey and prevent tree regeneration in closed-canopy forest (Dodson and Gentry 1991, Jiggins et al. 1999), and recent information suggests that cattle grazing may have caused a decline in the species at El Tundo Nature Reserve (R. Williams in litt. 2003). At higher elevations within its range, habitat destruction is not as severe, but logging, agricultural conversion and plantations are destroying and degrading forest (Dodson and Gentry 1991). However, this species appears to thrive in bamboo-dominated second-growth that grows back once pasture is abandoned (Ridgely and Greenfield 2001). Cutting of bamboo for pack-animal food is a problem. These threats have already led to fragmentation of available habitat. In Peru the principal threat is habitat destruction and degradation, including cattle damage to forest understorey, agricultural expansion and wood extraction (F. Angulo in litt. 2012).

Conservation Actions Underway
Populations occur in four protected areas, El Tundo Nature Reserve, Ecuador (Dodson and Gentry 1991), Cerros de Amotape National Park and Tumbes National Reserve (now part of the Northwest Peru Biosphere Reserve), and the Bosques Nublados de Udima Wildlife Refuge, Peru (Angulo 2009, F. Angulo in litt. 2012). Conservation Actions Proposed
Survey for the species in suitable habitat within and adjacent to its known range. Protect additional forest within its range. Fence El Tundo Nature Reserve to exclude livestock (Dodson and Gentry 1991). Research the association with bamboo and what importance this has to the species's conservation. In Peru, search for the species in protected areas such as Salitral – Huarmaca Regional Conservation Area and Laquipampa Wildlife Refuge (F. Angulo in litt. 2012).

References
Angulo, F. 2009. Informe ornitológico de la visita a la cuenca alta de los ríos Zaña y Chancay. BirdLife International.

Collar, N. J.; Gonzaga, L. P.; Krabbe, N.; Madroño Nieto, A.; Naranjo, L. G.; Parker, T. A.; Wege, D. C. 1992. Threatened birds of the Americas: the ICBP/IUCN Red Data Book. International Council for Bird Preservation, Cambridge, U.K.

Dodson, C. H.; Gentry, A. H. 1991. Biological extinction in western Ecuador. Annals of the Missouri Botanical Garden 78: 273-295.

Jiggins, C. D.; Andrade, P.; Cueva, E.; Dixon, S.; Isherwood, I.; Willis, J. 1999. The conservation of three forests in south west Ecuador: Reserva Natural El Tundo, Hacienda Jujal and Tambo Negro.

Kikuchi, D. W. 2009. Terrestrial and understorey insectivorous birds of a Peruvian cloud forest: species richness, abundance, density, territory size and biomass. Journal of Tropical Ecology 25: 523-529.

Ridgely, R. S.; Greenfield, P. J. 2001. The birds of Ecuador: status, distribution and taxonomy. Cornell University Press and Christopher Helm, Ithaca and London.

Schulenberg, T. S.; Stotz, D. F. ; Lane, D. F.; O'Neill, J. P.; Parker III, T. A. 2007. Birds of Peru. Prnceton University Press, Prnceton, NJ, USA.

Further web sources of information
Detailed species account from the Threatened birds of the Americas: the BirdLife International Red Data Book (BirdLife International 1992). Please note taxonomic treatment and IUCN Red List category may have changed since publication.

Detailed species account from the Threatened birds of the Americas: the BirdLife International Red Data Book (BirdLife International 1992). Please note, taxonomic treatment and IUCN Red List category may have changed since publication.

Explore HBW Alive for further information on this species

Recuento detallado de la especie tomado del libro Aves Amenazadas de las Americas, Libro Rojo de BirdLife International (BirdLife International 1992). Nota: la taxonomoía y la categoría de la Lista Roja de la UICN pudo haber cambiado desde esta publicación.

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

Text account compilers
Bird, J., Butchart, S., Harding, M., Isherwood, I., Sharpe, C J, Stuart, T., Symes, A.

Contributors
Freile, J., Williams, R., Angulo Pratolongo, F.

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

Recommended citation
BirdLife International (2014) Species factsheet: Myrmeciza griseiceps. Downloaded from http://www.birdlife.org on 22/10/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/10/2014.

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.

Additional resources for this species

ARKive species - Grey-headed antbird (Myrmeciza griseiceps) 0

Key facts
Current IUCN Red List category Vulnerable
Family Thamnophilidae (Antbirds)
Species name author (Chapman, 1923)
Population size 2500-9999 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 17,900 km2
Country endemic? No
Links to further information
- Additional Information on this species