Important Bird Area Pilanesberg
SA Number: SA 023
Status: Global (Ai)
Protection: Fully Protected
Site Description
Pilanesberg National Park (called a National Park because it used to belong to the homeland of Bophuthatswana) is managed by North-west Parks Board. It lies c. 160 km northwest of Johannesburg, and is the fourth largest protected area in South Africa. The Park covers a wide range of habitats, including vleis, lakes, streams, thick bush, broadleaved and Acacia woodland, koppies, open grasslands and former farmlands. The Park encompasses the Pilanesberg Mountains, which were formed after a complex chain of events, including several cycles of volcanic eruptions, outpourings of lava, the collapse of craters, ring fracturing around the volcano, and the intrusion of magma into these fractures. The end result was several concentric rings of igneous rock of different ages around the core of a volcano. Since then, there has been a slow subsidence and erosion of the complex from a 7 000m-high volcano to a humble remnant of its former self, rising to only 700 m above the surrounding plains. Strictly speaking, the Pilanesberg is no longer an ancient volcano, but a cross-section through the magma pipes that were located at great depth beneath the volcano. The resulting structure is a ring-complex of concentric koppies composed of a unique suite of alkaline volcanic rocks, the highest being 1 669 m a.s.l., interspersed in a matrix of low-lying plains.
The Mankwe River and its five major tributaries provide most of the Park’s water. In the past, farmers constructed additional water storage dams for livestock in order to supplement non-perennial streams. The largest impoundment, Mankwe Lake, is in the centre of the Park. The area’s annual average minimum and maximum temperatures are 4°C and 32°C respectively, but extremes can range from – 6°C to 40°C. Rain falls mainly in summer, in the form of violent thunderstorms accompanied by much lightning. Rainfall is highly variable between years, but an average of 621 mm p.a. has been recorded.
Birds
Owing to the extensive range of habitats, and the fact that the Reserve is situated on the overlap zone between the dry western and wet eastern parts of the country, the Park holds over 300 species of bird. Situated midway between the Magaliesberg (IBA SA025) and Waterberg (IBA SA007) Cape Vulture Gyps coprotheres colonies, this site regularly holds foraging birds. The Park also holds small numbers of White-backed Vulture
Gyps africanus and occasionally Lappet-faced Vulture
Torgos tracheliotus. The Reserve is good for raptors and supports small numbers of Martial Eagle
Polemaetus bellicosus, Bateleur
Terathopius ecaudatus, Verreaux’s Eagle
Aquila verreauxii, Tawny Eagle Aquila rapax, Wahlberg’s Eagle
Hieraaetus wahlbergi, African Hawk-Eagle
Aquila spilogaster, Brown Snake-Eagle
Circaetus cinereus and Black-chested Snake-Eagle
Circaetus pectoralis. Rocky outcrops are known to hold breeding Cape Eagle-Owl
Bubo capensis and Freckled Nightjar
Caprimulgus tristigma. The Mankwe River holds small populations of African Finfoot
Podica senegalensis and White-backed Night-Heron
Gorsachius leuconotus. A large vlei with mixed grassland at the eastern end of Mankwe Dam provides habitat for African Grass-Owl
Tyto capensis. The surrounding woodland–grassland mosaic is known to hold Secretarybird
Sagittarius serpentarius, Kori Bustard
Ardeotis kori and Blue Crane
Anthropoides paradiseus. Black Stork
Ciconia nigra occurs as an occasional visitor. Other woodland specials include Monotonous Lark Mirafra passerina, Southern Pied Babbler
Turdoides bicolor, White-throated Robin-chat
Cossypha humeralis, Kalahari Scrub-Robin
Erythropygia paena, Burnt-necked Eremomela
Eremomela usticollis, Striped Pipit
Anthus lineiventris, Barred Wren-Warbler
Calamonastes fasciolatus, Marico Flycatcher
Bradornis mariquensis, Crimson-breasted Shrike
Laniarius atrococcineus, Southern White-crowned Shrike
Eurocephalus anguitimens, Great Sparrow
Passer motitensis, Scaly-feathered Finch
Sporopipes squamifrons, Violet-eared Waxbill
Uraeginthus granatinus, Black-faced Waxbill
Estrilda erythronotos and Shaft-tailed Whydah
Vidua regia.
