Alethe choloensis

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

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Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
ANIMALIA	CHORDATA	AVES	PASSERIFORMES	TURDIDAE

Scientific Name:

Alethe choloensis

Species Authority:

Sclater, 1927

Common Name/s:

English	–	Cholo Alethe, Cholo Mountain Alethe, Thyolo Alethe
French	–	Alèthe du Mont Cholo

Assessment Information [top]

Red List Category & Criteria:

Endangered A2c+3c+4c;B1ab(i,ii,iii,iv,v) ver 3.1

Year Assessed:

2008

Assessor/s:

BirdLife International

Reviewer/s:

Butchart, S. & Taylor, J.

Contributor/s:

Barnes, K., Dowsett-Lemaire, F., Dyer, M., Haugaard, J., Kaliba, P., Luhanga, L. & Parker, V.

Justification:
Most of this species's locations within its very small range are under severe pressure from deforestation and forest degradation. These threats are increasing, deforestation is accelerating and much of its remaining habitat is likely to be cleared in the near future. This is likely have led to an ongoing very rapid decline in the species's very small and severely fragmented population. The species is therefore listed as Endangered. The rate of forest destruction appears to be increasing and the species may warrant uplisting to Critically Endangered in the future.

History:

2004	–	Endangered
2000	–	Endangered
1996	–	Vulnerable
1994	–	Vulnerable

Geographic Range [top]

Range Description:	Alethe choloensis is known from 16 areas of forest, 13 of them in south-eastern Malawi (east of the Shire river), plus three in adjacent Mozambique (Mts Namuli⁶, Chiperone^6,11 and Mabu¹¹). The species probably occurs on mountains between Mts Namuli and Mabu¹⁴. Its world population was thought to be in the range of c.2,500-5,000 mature individuals. However, in 2005, the species was discovered on Mt Mabu, where the population is conservatively suspected to number c.2,000 individuals¹¹. In Malawi, there were c.1,500 pairs in 1983, mostly on Mt Mulanje (1,000 pairs) and Mt Thyolo (200 pairs)², but the population has almost certainly decreased since then^4,10. Recent reports (2003) suggest that the Malawi population is now confined to five areas and that two historical sites (including Thyolo) have been lost to encroachment by agriculturalists^10,11. The most important remaining populations in Malawi are likely to be on Chikala Hill and in the Ruo and Chisongeli forests on Mt Mulanje¹². In 1998, c.1,000 pairs were estimated on Mt Namuli⁸, extrapolating from a one-week study that found a much higher density locally (c.8 birds/ha⁸) than has been found by more detailed, larger-scale and longer-term studies of Alethe species elsewhere (mostly c.0.4 mature individuals/ha)⁴. These figures may be far too high due to a combination of the survey and calculation methods used¹⁴. In November 2007, the species was recorded as reasonably common in Ukalini Forest (Mt Namuli), at c.2 pairs/10 ha. The population in Manho Forest (Mt Namuli) was estimated at 'a few dozen pairs' in 2007¹⁴. On Mt Chiperone, the population is conservatively suspected to number c.800 individuals¹¹.
Countries:	Native: Malawi; Mozambique
Range Map:	Click here to open the map viewer and explore range.

Population [top]

Population:	The world population was thought to be in the range of c.2,500-5,000 mature individuals, however in 2005 the species was discovered on Mt Mabu in Mozambique, where the population is conservatively suspected to number c.2000 individuals, and there are other areas of this country that could hold the species (Spottiswoode et al. in prep.). Thus on the basis that further exploration is required before a reliable estimate of the total population can be made, the population is placed in the range bracket for 2,500-9,999 individuals.
Population Trend:	Decreasing

Population:

The world population was thought to be in the range of c.2,500-5,000 mature individuals, however in 2005 the species was discovered on Mt Mabu in Mozambique, where the population is conservatively suspected to number c.2000 individuals, and there are other areas of this country that could hold the species (Spottiswoode et al. in prep.). Thus on the basis that further exploration is required before a reliable estimate of the total population can be made, the population is placed in the range bracket for 2,500-9,999 individuals.

Population Trend:

Decreasing

Habitat and Ecology [top]

Habitat and Ecology:	It is a terrestrial bird of submontane evergreen forest, and breeds at mid-altitudes (mainly above 1,200 m) but can occur lower in the non-breeding season (March-October)². Its population density is closely tied to the presence of ant-nests. Pairs can persist in forest patches as small as 0.5 ha if there is an ant-nest, but the density is usually much lower⁴.
Systems:	Terrestrial

Threats [top]

Major Threat(s):	Deforestation at its sites in Malawi is intense; between the 1970s and early 1990s, at least three of its localities were completely cleared, e.g. the 40 km² Chisongeli Forest (Mt Mulanje)^2,3,4. Deforestation of Chisongeli Forest had stabilised at c.1,600 m in 2007, with nearly all forest cleared below this altitude, and only c.20 km² remaining between 1,600 and 2,000 m¹⁴. During 1995-1996, severe fires destroyed much of its habitat at Lisau (Mt Chiradzulu) as well as parts on Zomba⁴ which hold the second largest population of this species⁹. Over the period 1999-2003, Thyolo Forest Reserve was completely cleared for subsistence agriculture, reducing forest on the mountain to a single small fragment on private land¹¹. Soche Mountain has lost 30-40% of its remaining mist-belt forest^9,10 and forest at Ndirande was completely cleared in the 1990s¹³. During the late 1990s, selective logging started at Mt Namuli, and a road passing close to the summit was being built, which was expected lead to large-scale forest exploitation from the densely-populated lower slopes⁷. In November 2007, it was noted that the extent of mid-altitude forest on the eastern slopes of Mt Namuli was in decline and that suitable habitat for the species was almost gone¹⁴. The threats on Mt Namuli include fires, encroachment by settlements and iron-smelting. Limited encroachment (c.5 ha in November 2007) of Ukalini Forest has taken place, small areas of Manho Forest have been cleared for cultivation, and both Ukalini and Manho Forests are threatened by the extraction of Faurea wentzeliana for the trade in construction material. The gaps left by such extraction are detrimental to the species, as it requires a shaded understorey¹⁴. Encroachment by subsistence farmers and logging is expected to occur on Mt Chiperone in the near future⁷, although this may slow at higher altitudes because of steep terrain and local spiritual beliefs¹¹. At Mt Mabu, commercial tea farming will reportedly resume in the near future on abandoned tea estates at low altitudes, and this could lead to a human population influx¹¹. There will soon be very little habitat remaining for the species across its range^4,9,10.

Major Threat(s):

Deforestation at its sites in Malawi is intense; between the 1970s and early 1990s, at least three of its localities were completely cleared, e.g. the 40 km² Chisongeli Forest (Mt Mulanje)^2,3,4. Deforestation of Chisongeli Forest had stabilised at c.1,600 m in 2007, with nearly all forest cleared below this altitude, and only c.20 km² remaining between 1,600 and 2,000 m¹⁴. During 1995-1996, severe fires destroyed much of its habitat at Lisau (Mt Chiradzulu) as well as parts on Zomba⁴ which hold the second largest population of this species⁹. Over the period 1999-2003, Thyolo Forest Reserve was completely cleared for subsistence agriculture, reducing forest on the mountain to a single small fragment on private land¹¹. Soche Mountain has lost 30-40% of its remaining mist-belt forest^9,10 and forest at Ndirande was completely cleared in the 1990s¹³. During the late 1990s, selective logging started at Mt Namuli, and a road passing close to the summit was being built, which was expected lead to large-scale forest exploitation from the densely-populated lower slopes⁷. In November 2007, it was noted that the extent of mid-altitude forest on the eastern slopes of Mt Namuli was in decline and that suitable habitat for the species was almost gone¹⁴. The threats on Mt Namuli include fires, encroachment by settlements and iron-smelting. Limited encroachment (c.5 ha in November 2007) of Ukalini Forest has taken place, small areas of Manho Forest have been cleared for cultivation, and both Ukalini and Manho Forests are threatened by the extraction of Faurea wentzeliana for the trade in construction material. The gaps left by such extraction are detrimental to the species, as it requires a shaded understorey¹⁴. Encroachment by subsistence farmers and logging is expected to occur on Mt Chiperone in the near future⁷, although this may slow at higher altitudes because of steep terrain and local spiritual beliefs¹¹. At Mt Mabu, commercial tea farming will reportedly resume in the near future on abandoned tea estates at low altitudes, and this could lead to a human population influx¹¹. There will soon be very little habitat remaining for the species across its range^4,9,10.

Conservation Actions [top]

Conservation Actions:	Conservation Actions Underway Several sites in Malawi are Forest Reserves, but in reality this provides negligible protection. Forest on Mt Namuli and Mt Chiperone is not protected, although efforts were underway in early 2008 to protect some of this habitat¹⁴. If access to Mt Namuli improves, it is a potential site for ecotourism-based conservation¹. The main stronghold in Malawi of this near-endemic is undoubtedly Mulanje Mountain, which is now the centre of a major GEF programme which will hopefully ensure the survival of the mist-belt forests circling the mountain⁹. Conservation Actions Proposed Initiate a campaign in Malawi of land reform and conservation of water resources through the maintenance of remaining forest reserves^4,5. Protect forest on Mt Namuli from logging⁸. Carry out extensive surveys on Mt Mabu and Mt Chiperone and other areas in northern Mozambique, such as Mt Morrumbala and the highlands near Njesi Plateau¹¹. Conduct surveys to re-assess the species's status on Mt Namuli¹⁴. Once initial surveys have been conducted in all potential areas, assess the species's population size across its range. Once a baseline population estimate has been obtained, continue to monitor population trends. Monitor the rate of forest clearance and extent of habitat degradation.

Conservation Actions:

Conservation Actions Underway
Several sites in Malawi are Forest Reserves, but in reality this provides negligible protection. Forest on Mt Namuli and Mt Chiperone is not protected, although efforts were underway in early 2008 to protect some of this habitat¹⁴. If access to Mt Namuli improves, it is a potential site for ecotourism-based conservation¹. The main stronghold in Malawi of this near-endemic is undoubtedly Mulanje Mountain, which is now the centre of a major GEF programme which will hopefully ensure the survival of the mist-belt forests circling the mountain⁹.

Conservation Actions Proposed
Initiate a campaign in Malawi of land reform and conservation of water resources through the maintenance of remaining forest reserves^4,5. Protect forest on Mt Namuli from logging⁸. Carry out extensive surveys on Mt Mabu and Mt Chiperone and other areas in northern Mozambique, such as Mt Morrumbala and the highlands near Njesi Plateau¹¹. Conduct surveys to re-assess the species's status on Mt Namuli¹⁴. Once initial surveys have been conducted in all potential areas, assess the species's population size across its range. Once a baseline population estimate has been obtained, continue to monitor population trends. Monitor the rate of forest clearance and extent of habitat degradation.

Citation:	BirdLife International 2008. Alethe choloensis. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloaded on 08 February 2012.
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