||Cape Verde Warbler, Cape Verde Swamp-Warbler, Cape Verde Islands Cane Warbler, Cape Verde Cane Warbler
||Rousserolle des Iles du Cap-Vert
||AERC TAC. 2003. AERC TAC Checklist of bird taxa occurring in Western Palearctic region, 15th Draft. Available at: #http://www.aerc.eu/DOCS/Bird_taxa_of _the_WP15.xls#.
||14-16 cm. Medium-sized warbler. Dun-brown above with warm buff belly and flanks and creamy throat and breast. Long, pointed bill, black legs and toes. Sexes similar. Voice Loud, explosive song with clear whistles and blurred churring heard throughout the year, but most intense between August and November. Hints Small parties sometimes feed communally in fruiting fig trees Ficus spp., together with Blackcap Sylvia atricapilla (Hazevoet 1995).
|Red List Category & Criteria:
||Taylor, J. & Butchart, S.
||Hazevoet, C., Hering, H. & Hering, J.
||Ekstrom, J., Shutes, S., Symes, A., Taylor, J.
This species is confined to three small islands where, despite its adaptation to artificial habitats, its population is suspected to be declining as a result of successive droughts and an increasing human population. Its future on one island, in particular, is precarious. It is therefore classified as Endangered. The discovery of a relatively large population on Fogo, where it occurs commonly in plantations and crops, suggests that it may be less threatened than was previously feared, and if it is no longer considered to be undergoing continuing declines it may be eligible for downlisting in the future.
|Previously published Red List assessments:|
- 2008 – Endangered (EN) –
- 2004 – Endangered (EN) –
- 2000 – Endangered (EN) –
- 1996 – Vulnerable (VU) –
- 1994 – Vulnerable (VU) –
- 1988 – Lower Risk/least concern (LR/lc) –
|Range Description:||Acrocephalus brevipennis was once believed to be confined to Santiago, Cape Verde Islands, where it is now only locally distributed, mainly in the interior, with a few isolated sites in the south and west. It has apparently died out on Brava (no records since 1969 and formerly scarce) and was believed to have died out on São Nicolau (where it was formerly numerous). However, a previously unreported specimen collected on São Nicolau in October 1970 was discovered in the collection of the Centro de Zoologia, Lisbon, providing the impetus for a thorough search of the island (Hazevoet 1999a) and, in 1998, surveys located eight territories confined to the north-west of the island (though its long-term prospects for survival here are poor) (Hazevoet et al. 1999). In October 2004 a population was discovered on Fogo, and it has since been found to be widespread across the northern half of the island between 200-975 m, with the total population on the island conservatively estimated at 500 pairs (Hering and Hering 2005, Hering and Fuchs 2009). In addition, the species may have formerly occurred on Santo Antão (Hazevoet 1995). On Santiago, the species was recently reported from Tarrafal, far to the north of the species's known range (C.J. Hazevoet in litt. 2007). The total population was estimated at c.500 pairs in the early 1990s (Hazevoet 1995), and thought to number 1,000-1,500 birds based on its known range in 2007 (C.J. Hazevoet in litt. 2007). However the discovery of relatively large numbers on Fogo means that the total is probably considerably higher.|
|♦ Continuing decline in area of occupancy (AOO):||Yes|
|♦ Extreme fluctuations in area of occupancy (AOO):||No||♦ Estimated extent of occurrence (EOO) - km2:||1300|
|♦ Continuing decline in extent of occurrence (EOO):||Yes||♦ Extreme fluctuations in extent of occurrence (EOO):||No|
|♦ Number of Locations:||2-5||♦ Continuing decline in number of locations:||Yes|
|♦ Extreme fluctuations in the number of locations:||No|
|♦ Upper elevation limit (metres):||500|
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||The population was estimated at c.500 pairs in the early 1990s, and was thought to number 1,000-1,500 birds based on its known range in 2007 (C. J. Hazevoet in litt. 2007). However, conservative estimates of 500 pairs on Fogo mean that the total population is likely to be higher, likely numbering 1,500-2,000 mature individuals, roughly equivalent to 2,200-3,000 individuals in total.|
Trend Justification: Despite the discovery of a large population on Fogo in 2004 and a recent report from Tarrafal on Santiago, the overall population is suspected to be declining owing to habitat loss, although substantive evidence of this is lacking (C.J. Hazevoet in litt. 2007). The Fogo population favours coffee plantations and introduced crops and the population may yet prove to be stable.
|Current Population Trend:||Decreasing|
|♦ Number of mature individuals:||1500-2000||♦ Continuing decline of mature individuals:||Yes|
|♦ Extreme fluctuations:||No||♦ Population severely fragmented:||No|
|♦ No. of subpopulations:||2-100||♦ Continuing decline in subpopulations:||Unknown|
|♦ Extreme fluctuations in subpopulations:||No||♦ All individuals in one subpopulation:||No|
|Habitat and Ecology:||Its original habitat was probably scrub on mountain slopes and reedbeds in valleys (Hazevoet 1993). It is now found in a broad range of habitats up to 1000 m (J. Hering and H. Hering in litt. 2004) (though mostly lower, and formerly only thought to range to 500 m (Hazevoet 1995)). The habitats occupied at lower elevations include well-vegetated valleys (especially with patches of reeds), reedbeds, woodland, agricultural areas, and gardens in villages and small towns, notably near running water (Hazevoet 1995). In 2004, a population in the interior of Santiago was noted inhabiting Eucalyptus forest with dense, bushy undergrowth at 800-1000 m (J. Hering and H. Hering in litt. 2004). On São Nicolau, it inhabits small, dense stands of cane Arundo donax along dry riverbeds, often with shrubs and fruit trees (Hazevoet et al. 1999). On Fogo, it inhabits coffee plantations with scattered fruit trees and maize fields with coffee bushes in areas characterised by narrow, shrub-filled ravines at 490-950 m (Hering and Hering 2005, Hering and Fuchs 2009). It breeds mainly in August-November, but the breeding season may be extended in response to local rainfall (Hazevoet 1995). |
|Continuing decline in area, extent and/or quality of habitat:||Yes|
|Generation Length (years):||4.4|
|Movement patterns:||Not a Migrant|