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Bannerman's Weaver Ploceus bannermani

Justification
This species is more common than previously thought. However, while not dependent on primary forest, the species's forest-edge habitat is at risk from clearance for subsistence agriculture in part of its small, fragmented range. It therefore qualifies as Vulnerable.

Taxonomic source(s)
Dowsett, R. J.; Forbes-Watson, A. D. 1993. Checklist of birds of the Afrotropical and Malagasy regions. Tauraco Press, Li
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.

Identification
13-14 cm. Medium-sized weaver. Greenish-olive upperparts except for crown and nape which are rich, golden-yellow. Black face and throat, imparting masked effect. Remainder of underparts bright golden-yellow. Black bill and legs. Female identical to male. Voice Undescribed. Hints Birds sometimes occur in small groups.

Distribution and population
Ploceus bannermani occurs in western Cameroon (chiefly in the Bamenda Highlands, notably at Mt Oku, also Mt Tchabal Mbabo on the Adamawa Plateau) and eastern Nigeria (on the Obudu and Mambilla Plateaux, where 12-40 were seen per day in 1988). In 1999, it was found to be common in suitable habitat on the crater of Mt Manenguba, south-west Cameroon (Dowsett-Lemaire and Dowsett 1999c) and, in 1998, rare or local at Kodmin in the nearby Bakossi Mountains, this latter representing a small range-extension to the south-west (Dowsett-Lemaire and Dowsett 1998d).

Population justification
The population size is preliminarily estimated to fall into the band 10,000-19,999 individuals. This equates to 6,667-13,333 mature individuals, rounded here to 6,000-15,000 mature individuals.

Trend justification
The species's population is suspected to be declining in line with the clearance and degradation of forest within its range. The likely rate of decline, however, has not been estimated.

Ecology
It occurs at 1,100-2,900 m, occupying forest edge and dense, shrubby habitat in more open parts of montane forest (Dowsett-Lemaire and Dowsett 1998c) and even farmland, where there are some natural trees and shrubs (J. DeMarco in litt. 2000). On the Obudu Plateau, it occurs along the edges of narrow strips of forest in deep ravines. It would appear to tolerate a certain amount of forest degradation (Elgood et al. 1994). Breeding has been observed in December and January at Lake Manengouba, and in November in Danko Forest Reserve, Nigeria.

Threats
There is considerable loss of habitat in the Bamenda Highlands due to clearance for agriculture, grazing, firewood-collection and timber-extraction (J. DeMarco in litt. 2000). Forest fires are probably responsible for the greatest proportion of habitat loss (P. Forboseh in litt. 2003), for example c.500 ha of forest was burnt around Lake Oku in March 2000 (J. DeMarco in litt. 2000). However, the status of forest patches in Manenguba Crater is satisfactory and under very little human pressure (Dowsett-Lemaire and Dowsett 1999c). Plans for a 70,000 ha palm oil plantation threaten to significantly fragment large areas of suitable habitat in southwestern Cameroon if approved (Linder et al. 2012).

Conservation Actions Underway
Local communities are actively engaged in conserving montane forest at Mt Oku, with support from the Kilum-Ijim Forest Project (J. DeMarco in litt. 2000). There is an ongoing programme to monitor the condition of forest there, as well as the overall extent of forest cover in the Bamenda Highlands (J. DeMarco in litt. 2000). Community-based conservation activities was extended to other forest fragments in the Bamenda Highlands in 2000 (J. DeMarco in litt. 2000). A small area of forest is protected on the Obudu Plateau, and the montane area within the Gashaka-Gumti National Park, adjacent to Mambilla Plateau, affords good protection to the species (P. Hall in litt. 1999). Conservation Actions Proposed
Conduct field surveys on the Mambilla and Obudu Plateaux in Nigeria to ascertain the species's status there (P. Hall in litt. 1999). Conduct surveys in forest patches and other suitable habitat in the Cameroon mountains which are as yet unsurveyed (F. Maisels in litt. 1998, J. DeMarco in litt. 2000). Assess the total population size. Carry out regular surveys to monitor population trends. Monitor rates of forest clearance and degradation within its range. Increase the area of suitable habitat that is covered by protected areas and community-based conservation management.

References
Dowsett-Lemaire, F.; Dowsett, R. J. 1998. Zoological survey of small mammals, birds and frogs in the Bakossi and Kupe Mountains, Cameroon.

Dowsett-Lemaire, F.; Dowsett, R. J. 1999. Survey of birds and amphibians on Mt Manenguba, Mt Nlonako, north Bakossi and around Kupe in 1988-99.

Elgood, J. H.; Heigham, J. B.; Moore, A. M.; Nason, A. M.; Sharland, R. E.; Skinner, N. J. 1994. The birds of Nigeria. British Ornithologists' Union, Tring, U.K.

Linder, J.M.; Laurence, W.F.; Struhsaker, T.T.; Ehrlich, P.R.; Raven, P.H.; Fredriksson, G.; Bradshaw, C.J.A.; Brook, B.W.; Koh, L.P; Waltert, M. 2012. An Open Letter about the Environmental and Social Impacts of a Massive Oil Palm Development in Cameroon.

Text account compilers
Benstead, P., Ekstrom, J., Shutes, S., Symes, A., Taylor, J.

Contributors
DeMarco, J., Dowsett-Lemaire, F., Forboseh, P., Hall, P., Maisels, F., Thomas, D., Whytock, R.

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

Recommended citation
BirdLife International (2014) Species factsheet: Ploceus bannermani. Downloaded from http://www.birdlife.org on 24/04/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 24/04/2014.

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 - Bannerman’s weaver (Ploceus bannermani) 0

Key facts
Current IUCN Red List category Vulnerable
Family Ploceidae (Weavers and allies)
Species name author Chapin, 1932
Population size 6000-15000 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 10,900 km2
Country endemic? No
Links to further information
- Additional Information on this species
- Climate change species distributions