|Location||St Helena (to UK), St Helena|
|Central coordinates||5o 45.00' West 15o 59.00' South|
|IBA criteria||A1, A2, A4i, A4ii|
|Altitude||0 - 798m|
|Year of IBA assessment||2001|
Summary Update for site in Prater T. (2012). Important Bird Areas: St. Helena. British Birds 105: 638-653
Site description The site covers the south-western part of the island, south of a line linking Powell Point and The Buoys in the south-east and Horse Pasture Point in the north-west, via Clifford Arboretum in the interior, together with Egg Island (79m), Speery Island (120m) and all other offshore islets, stacks and rocks. All four vegetation zones on the island are represented. Below 350m, c.25% of the area, the landscape is arid with large-scale erosion, dominated by Suaeda, Lantana and Carpobrotus. This gives way to pasture and non-indigenous woodland, up to 500m, dominated by Pennisetum, Cynodon and Digitaria, with Acacia and Pinus. Above 500m lies moist and semi-moist grassland, woodland (dominants include Agrostis, Pennisetum and Stenotaphrum, with Podocarpus, Acacia and Pinus) and flax Phormium tenax plantations. At High Peak is a small remnant native thicket of endemic Dicksonia ferns and Melanodendron cabbage trees. The coast is dominated by imposing sea cliffs, rising mainly to between 300m and 570m. High Peak (798m), in the far north-east, is the highest point. Egg Island, off the north-west lee side, is a mass of pale bedded lavas with an apparent dip towards the south-west, while nearby Peaked Island (32m) is a sharp pyramid of scoriaceous slag. Speery Island is a spectacular steep-sided, jointed monolithic pipe of paler alkaline trachyte, whilst neighbouring Salt Rock (40m) is a remnant of a wide basaltic dyke. The remaining islets and stacks are basaltic. Vegetation (shrubs, grasses, weeds) has been noted only on Lighter Rock, Ladies Chair, Egg Island, Peaked Island and Thompsons Valley Island, all in the lee. Lichens have been found at the summit of Egg Island. The heaviest guano deposits are on Egg, Peaked and Speery Islands. In the south, the Speery Island group of outliers is much more exposed and, but for Speery Island itself, has not been visited by ornithologists and may therefore harbour unrecorded seabirds. Included in the IBA are three important breeding sites for Charadrius sanctaehelenae, i.e. at Broad Bottom, Southern Pastures and Man and Horse. There is an important fossil site at Sandy Bay.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Red-billed Tropicbird Phaethon aethereus||breeding||1988||43 breeding pairs||medium||A4ii||Least Concern|
|St Helena Plover Charadrius sanctaehelenae||resident||2001||100 individuals||good||A1, A4i||Critically Endangered|
|Protected area||Designation||Area (ha)||Relationship with IBA||Overlap with IBA (ha)|
|Norman Williams Nature Reserve||Wildlife Reserve||7||protected area contained by site||7|
|Old Joan Point National Forest||Forest Reserve||560||protected area contained by site||560|
|Land-use||Extent (% of site)|
|nature conservation and research||-|
Other biodiversity As with North-east St Helena (SH003), the endemic invertebrates are of particular importance.
References Ashmole and Ashmole (2000), Benson (1950), Chapin (1954), Cronk (2000), Drucker and Pearce-Kelly (1992), Hartog (1984), Haydock (1954), Maunder et al. (1993), McCulloch (1991, 1992, 1999), McCulloch and Norris (in press), Melliss (1875), Olson (1973, 1975), Pearce-Kelly and Cronk (1990), Rowlands (1992, 1995, 2001), Rowlands and Trueman (1999), Rowlands et al. (1998).
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: South-west St Helena. Downloaded from http://www.birdlife.org on 19/12/2013
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