Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Scrophulariales Acanthaceae

Scientific Name: Acanthopale decempedalis
Species Authority: C.B.Clarke

Assessment Information [top]

Red List Category & Criteria: Vulnerable B2ab(iii) ver 3.1
Year Published: 2014
Date Assessed: 2011-03-25
Assessor(s): Darbyshire, I.
Reviewer(s): Onana, J.-M.
Facilitator/Compiler(s): Bachman, S.
This species is listed as Vulnerable based on a small area of occupancy (100 km2), occurrence at six locations and continuing decline in the extent and quality of the forest habitat where it grows.
Previously published Red List assessments:
2004 Vulnerable (VU)

Geographic Range [top]

Range Description: Has a fairly wide range in West Africa but Kupe-Bakossi (in Cameroon) appears to be the most important area for A. decempedalis, being recorded at six locations here.  Extent of occurrence (EOO) and area of occupancy (AOO) were calculated using GeoCAT (Bachman et al. 2011).
Countries occurrence:
Cameroon; Equatorial Guinea (Bioko); Nigeria
Estimated area of occupancy (AOO) - km2: 100
Number of Locations: 6
Lower elevation limit (metres): 700
Upper elevation limit (metres): 2300
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: This taxon forms gregarious communities together with Mimulopsis solmsii, Brachystephanus giganteus (both Acanthaceae) and Plectranthus insignis (Labiatae), flowering together en masse on seven to nine year cycles followed by die-off and subsequent regeneration from seed (Cheek et al. 2000, Cheek et al. 2004),. M. solmsii is a widespread Afromontane taxon but the remainder are restricted to the west Cameroon uplands phytochorion.
Current Population Trend: Decreasing
Additional data:
Continuing decline of mature individuals: No
Extreme fluctuations: No Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: Grows in the understorey of closed canopy submontane and montane forest, occasionally found in disturbed forest; (700-)1,000-2,300 m altitude.
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Yes

Use and Trade [top]

Use and Trade: The dead woody stems of these taxa following mass-flowering years, provide a source of firewood for local populations in the Bamenda Highlands.

Threats [top]

Major Threat(s): Much of the submontane and montane forest in SW remains relatively undisturbed, but clearance for agriculture has been widespread in the Bamileke Plateau/Bamenda Highlands, threatening these populations where they have not already been wiped out. Furthermore, the cyclical mass-flowering habit of this species makes it susceptible to short-term stochastic change, for example local fire events or landslides which could decimate seedling populations.

Conservation Actions [top]

Conservation Actions: Current population sizes in terms of both number of individuals and area of occupancy (AOO) should be assessed as this is not clear from the specimen data. A better understanding of the flowering cycle of this community should be gained, including population fluctuations between cycles. Bamenda Highlands populations outside protected areas may provide valuable information on how immature populations respond to increased anthropogenic pressures.

Citation: Darbyshire, I. 2014. Acanthopale decempedalis. The IUCN Red List of Threatened Species 2014: e.T45402A3000415. . Downloaded on 09 October 2015.
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