Pseudocalyptomena graueri 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Eurylaimidae

Scientific Name: Pseudocalyptomena graueri Rothschild, 1909
Common Name(s):
English Grauer's Broadbill, African Green Broadbill
French Eurylaime de Grauer
Taxonomic Source(s): del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.
Identification information: 10 cm. Small, rotund, short-tailed bird. Overall leaf-green in colour with blue throat, breast and rump. Voice High-pitched and squeaky twittering. Hints Sluggish in movement when feeding, but fluffs body feathers and shivers and trembles and quivers wings when excited and in display. Usually found at 7-20 m in dense foliage, occurring singly, in pairs, or parties of up to 10, often joining mixed-species flocks (Hall et al. 1998).

Assessment Information [top]

Red List Category & Criteria: Vulnerable B1ab(i,ii,iii,v); C2a(i) ver 3.1
Year Published: 2016
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Butynski, T.M., Carswell, M., Plumptre, A. & Mugabe, H.
Facilitator/Compiler(s): Ekstrom, J., Evans, M., Shutes, S., Symes, A., Taylor, J. & Westrip, J.
This species has a small and fragmented range, within which its montane forest habitat continues to be degraded and cleared. Therefore it is likely to have a small and declining population, and is classified as Vulnerable.

Previously published Red List assessments:

Geographic Range [top]

Range Description:Pseudocalyptomena graueri is known from only two areas in the eastern Democratic Republic of Congo, the Itombwe Mountains and the mountains west of Lake Kivu, and one area in south-west Uganda, Bwindi (Impenetrable) Forest. The species is not considered common in Bwindi Forest, where density is probably one per km2, and recent surveys have been unsuccessful in locating the species in Kahuzi-Biéga National Park (A. Plumptre in litt. 2007).

Countries occurrence:
Congo, The Democratic Republic of the; Uganda
Additional data:
Continuing decline in area of occupancy (AOO):Yes
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:45600
Continuing decline in extent of occurrence (EOO):YesExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:11-100Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:NoLower elevation limit (metres):1760
Upper elevation limit (metres):2480
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population: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:  The population is suspected to have declined at a moderate rate, in line with the clearance and degradation of forest within the species's projected range, and this is expected to increase during the next ten years.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:2500-9999Continuing decline of mature individuals:Yes
Extreme fluctuations:NoPopulation severely fragmented:Yes
No. of subpopulations:2-100Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No

Habitat and Ecology [top]

Habitat and Ecology:It inhabits primary rainforest (up to 20 m off ground, but usually in middle strata in Bwindi), and also occurs in forest edge and isolated trees in cleared ground (Keith et al. 1992, M. Carswell in litt. 1999). It feeds on seeds, flowers, buds, fruit, beetles, larvae and snails (Keith et al. 1992). The only recorded nest was found 11 m up in a 20 m tree in the outermost branches overhanging a stream, situated in a valley floor with open shrubby vegetation (Keith et al. 1992). At Bwindi, adults have been seen feeding fledged young in March (M. Carswell in litt. 1999), but also feeding nestlings in July (H. Mugabe in litt. 2016).

Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):4.2
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): Deforestation and forest degradation are the most likely threats throughout its range. Forest in the Itombwe Mountains and Kahuzi-Biéga is under increasing pressure from pastoralists, farmers, pit-sawyers, miners and hunters (Butynski et al. 1997, Hall et al. 1998, Omari et al. 1999). The human population in this volatile area is increasing rapidly and thousands of refugees from Burundi and Rwanda live in camps at the base of Itombwe's eastern escarpment and to the north (Butynski et al. 1997, Hall et al. 1998, Omari et al. 1999). Clearance for agriculture, particularly along the southern and western edges of gallery montane forest, has increased dramatically in the past few years as maize crops have failed, causing famine (Butynski et al. 1997).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
It is very well-protected in Bwindi-Impenetrable National Park (T. Butynski in litt. 1999). The Kahuzi-Biéga National Park embraces much habitat west of Lake Kivu, but is under threat (Hall et al. 1998), and the Itombwe Mountains are not protected.

Conservation Actions Proposed
Evaluate its distribution and status within the projected range, once the security situation permits this. Carry out regular surveys to monitor population trends, once the security situation is conducive. Monitor rates of habitat loss and degradation within its projected range. As and when feasible, increase efforts to effectively protect Kahuzi-Biéga National Park. Increase the area of suitable habitat that has protected status, particularly in the Itombwe Mountains.

Citation: BirdLife International. 2016. Pseudocalyptomena graueri. The IUCN Red List of Threatened Species 2016: e.T22698719A93699841. . Downloaded on 23 May 2018.
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