Bathmocercus cerviniventris 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Cisticolidae

Scientific Name: Bathmocercus cerviniventris (Sharpe, 1877)
Common Name(s):
English Black-headed Rufous-warbler, Black-capped Rufous Warbler, Black-headed Rufous Warbler
French Fauvette à capuchon
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: 12-13 cm. Small, rufous, brown and black warbler. Black head and breast with chestnut belly and flanks. Brown upperparts, with darker wings and tail. Female drab brown with slightly paler throat. Voice Distinctive, three-note, piercing, insect-like whistle. Hints Creeps along forest floor, cocking tail.

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2017
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Allport, G., Fishpool, L., Huettmann, F., Rainey, H., Robertson, P., Thompson, H.S., Dowsett-Lemaire, F. & Dowsett, R.J.
Facilitator/Compiler(s): O'Brien, A., Shutes, S., Starkey, M., Symes, A., Taylor, J., Westrip, J.
This species is listed as Near Threatened because it is suspected to be undergoing a moderately rapid population decline owing to the limited impact on the species of forest clearance in lowland areas. Any evidence to suggest a greater rate of decline might qualify the species for uplisting to a higher threat category.

Previously published Red List assessments:

Geographic Range [top]

Range Description:Bathmocercus cerviniventris has a fragmented range from Guinea (one record from Sérédou but locally common on the Ziama Massif [Bützler 1996]; also recorded from Pic de Fon and Mont Bero Forest Reserves [H. Rainey in litt. 2007]), Sierra Leone (the Nimini Hills, Kono district, also Sandaru, probably Kankordu, Mongeri, Bumbuna and the Kangari Hills [Okoni-Williams 2001, F. Dowsett-Lemaire in litt. 2016], but apparently highly local [P. Robertson in litt. 1998]), Liberia (from the coast to the northern highlands, and has been described as frequent on Mt Nimba, although it may now be described as local) (Gatter 1997, F. Dowsett-Lemaire in litt. 2016), Côte d'Ivoire (Mt Nimba and Sipilou in the west, Taï National Park where its preferred habitat is rare [Gartshore et al. 1995], Marahoué National Park [P. Christy per L. D. C. Fishpool verbally 1998], and Gagnoa and Lamto in the south), and Ghana (very few records (3 specimens, the last of which was in 1900), and possible extinct [Dowsett-Lemaire and Dowsett 2009]). In Côte d'Ivoire, future surveys may well locate the species in Mt Peko National Park and mountains east of Mt Nimba (H. Rainey in litt. 1999). In 1997, in Liberia, on the basis of survey density estimates, the population was calculated to be at least 60,000 pairs (Gatter 1997); however, throughout much of its range it would appear to have an extremely local distribution and this population estimate may in fact be too large.

Countries occurrence:
Côte d'Ivoire; Guinea; Liberia; Sierra Leone
Possibly extinct:
Additional data:
Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:381000
Continuing decline in extent of occurrence (EOO):UnknownExtreme fluctuations in extent of occurrence (EOO):No
Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:No
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The global population size has not been quantified, but the species is described as locally common (del Hoyo et al. 2006).

Trend Justification:  The population is suspected to be declining moderately rapidly owing to ongoing habitat destruction.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:UnknownContinuing decline of mature individuals:Yes
Extreme fluctuations:NoPopulation severely fragmented:No
Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No
No. of individuals in largest subpopulation:100

Habitat and Ecology [top]

Habitat and Ecology:It is found in dense secondary vegetation bordering small creeks and rivers in various forest types (primary and secondary forest, swamp forest, gallery forest, sub-montane forest) and, more rarely, lowland forest (Gartshore et al. 1995, Gatter 1997, Urban et al. 1997). On the Ziama Massif, Guinea, it occurs in humid, open sites near old clearings within mature forest (Bützler 1996). It forages near the ground, always in pairs, on invertebrates (Bützler 1996, del Hoyo et al. 2006). A recently-fledged chick was observed in Sierra Leone during late June, suggesting laying in May (del Hoyo et al. 2006).

Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):3.1
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): Due to its specific habitat requirements the species is probably not at high risk from lowland commercial logging activities. However, such logging will affect adjoining habitat and may cause disturbance, as well as potentially damaging catchment areas and affecting habitat through run-off (H. Rainey in litt. 2007). A significant threat is the mining of iron ore and other minerals, which is a direct danger for this species in Guinea and Liberia. At the site investigated at Mt Nimba, Liberia (by Ben Phalan and F. Dowsett-Lemaire), the species was threatened by iron mining (ArcelorMittal). In fact, the birds seen in 2011 were expected to disappear, as the whole site was being destroyed (F. Dowsett-Lemaire in litt. 2016).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
No targeted conservation action is known for this species.

Conservation Actions Proposed
Conduct surveys to obtain an up-to-date population estimate. Monitor population trends through regular surveys. Monitor deforestation and forest degradation across its range. Protect suitable habitat for the species.

Amended [top]

Amended reason: Map updated: Extended a bit the range to reach Loma Mountains (NE Sierra Leone). EOO updated.

Citation: BirdLife International. 2017. Bathmocercus cerviniventris (amended version of assessment). The IUCN Red List of Threatened Species 2017: e.T22714569A118731943. . Downloaded on 28 May 2018.
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