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Southeastern Africa: South Africa, Mozambique, Botswana, Zambia, Zimbabwe, Swaziland, Namibia, and Malawi

Zambezian and Mopane Woodlands are dispersed throughout southern Africa, bounded by the Luangwa River in the north and the Pongola River in the south. Mopane tree (Colophospermum mopane) woodlands mix with Zambezian woodlands in lower-elevation areas, often along major river valleys. Although the ecoregion, particularly the mopane communities, is considered to be poor in endemics, it supports some of the largest and most significant wildlife populations in Africa, particularly those of the endangered elephant (Loxodonta africana) and critically endangered black rhino (Diceros bicornis). Important populations of predators are also found in the Zambezian and Mopane Woodlands. The abundance of wildlife can be largely attributed to the high level of protection in the ecoregion, in which more than 45 percent of the habitat is devoted to various forms of state and private conservation. Two cross-border conservation efforts are set to further increase the extent of protected lands in the near future.

  • Scientific Code
    (AT0725)
  • Ecoregion Category
    Afrotropical
  • Size
    182,700 square miles
  • Status
    Relatively Stable/Intact
  • Habitats

Description
Location and General Description
Zambezian and Mopane Woodlands are widespread throughout the lower-lying areas in the eastern half of southern Africa. This ecoregion is characterized by the dominance of the tree Colophospermum mopane (Caesalpiniaceae), which is the sole canopy species throughout much of its range (White 1983; Wild and Fernandes 1967). Elevation and rainfall are the major environmental factors separating Zambezian and Mopane Woodlands from its three major neighboring ecoregions: Central Zambezian Miombo Woodland, Eastern Miombo Woodland, and Southern Miombo Woodland. All three occur on the escarpments and uplands of the Great African Plateau in regions of higher rainfall (White 1983). Elevation also forms the basis of this ecoregion’s separation from the Southern African Bushveld and Drakensberg Montane Grassland, Woodland, and Forest ecoregions. The Southern Zanzibar-Inhambane and Maputaland Coastal Forest Mosaics form additional boundaries on the coastal zone. Zambezian and Mopane Woodlands diminish in the east, in the region of the Kalahari Sands (White 1983), where Zambezian Baikiaea Woodlands and Kalahari Acacia-Baikiaea Woodlands are found.

The Zambezian and Mopane Woodlands consist of several discontinuous units in southern Africa. The Luangwa and Pongola Rivers define the ecoregion’s northern and southern boundaries, respectively, while the Zambezi River broadly describes the east-west axis. The largest portion of this ecoregion ranges from Swaziland through northeastern South Africa, north through Mozambique, and divides into southeastern Zimbabwe and northern Zimbabwe, along the Zambezi Valley. A smaller portion of the ecoregion runs through northern Botswana and the eastern extremity of Namibia’s Caprivi Strip up through almost all of Zambia, including the Luangwa Valley in northeastern Zambia. Additional portions occur in southern Malawi in the Shire River Valley area. The ecoregion includes several of southern Africa’s major rivers, occupying the bulk of the Zambezi, Luangwa, Shire, and Limpopo River Valleys. Other regionally important rivers found within the Zambezian and Mopane Woodlands are the Save, Crocodile, and Nkomati Rivers.

The ecoregion falls largely within the tropical summer-rainfall zone, with precipitation largely confined to the period of November to April (White 1983). Annual average rainfall generally varies between 450 mm to 710 mm (Low and Rebelo 1996, Wild and Fernandes 1967, White 1983, Farrell 1968, Smith 1998), although parts of the ecoregion, particularly the higher elevations to the south, may receive up to 1,000 mm (White 1983, Low and Rebelo 1996). Minimum average rainfall may be as low as 250 to 325 mm in places (White 1983, Low and Rebelo 1996). Temperatures range between -4° and 46° C (Low and Rebelo 1996), with a mean annual temperature of 18° to 24° C (White 1983).

Terrain is generally flat or gently undulating along the floors of the major river valleys, with average elevations ranging from 200 m to 600 m (White 1983, Smith 1998). Parts of the ecoregion may occur at slightly higher elevations in rolling or broken country above 760 m (White 1983). The southeastern portion of the Zambezian and Mopane Woodlands occurs on the plains and foothills east of the Drakensberg escarpment, with elevation generally ranging from 170 m to 800 m (Low and Rebelo 1996), although heights of 1,525 m are attained in places (White 1983). The ecoregion’s geology is composed primarily of Precambrian granites and gneisses, with basalt and Permian sedimentary rocks being important in certain areas.

The ecoregion is composed of portions of three of White’s (1983) vegetation mapping units falling within the Zambezian regional center of endemism: mopane woodlands and scrub woodlands; north Zambezian undifferentiated woodland and wooded grassland; and south Zambezian undifferentiated woodland and scrub woodland. The first of these units is dominant in the ecoregion, particularly in the central, western, and northern areas (White 1983), and is characterized by the dominance of the mopane tree. Mopane often forms pure stands to the exclusion of other species, but is generally associated with several other prominent trees and shrubs, such as Kirkia acuminata, Dalbergia melanoxylon, Adansonia digitata, Combretum apiculatum, C. imberbe, Acacia nigrescens, Cissus cornifolia, and Commiphora spp. (White 1983, Low and Rebelo 1996, Wild and Fernandes 1967, Smith 1998, Farrell 1968).

Within this area mopane communities show considerable variation in height and density (White 1983). Trees in dense woodland or in more open savanna woodland may reach heights of 10 m to 15 m on deep alluvial soils, and attain 25 m in the "cathedral mopane" of Zambia (Smith 1998). Mopane tends to be stunted and shrubby (1 to 3 m) where it occurs on impermeable alkaline soils (White 1983, Smith 1998, Wild and Fernandes 1967). These two structural forms, and grades in between, often occur together in a mosaic depending on micro-climatic factors and soil conditions (White 1983, Smith 1998). Soil conditions may vary, but mopane soils generally possess an impervious B-horizon, or zone of accumulation (White 1983, Smith 1998).

The herbaceous component of mopane communities differs according to soil conditions and vegetation structure: dense swards are found beneath gaps in the mopane canopy on favorable soils, while grasses are almost completely absent in shrubby mopane communities on heavy, impermeable alkaline clays (Low and Rebelo 1996, Smith 1998, White 1983). Typical grasses include Aristida spp., Eragrotis spp., Digitaria eriantha, Brachiaria deflexa, Echinochloa colona, Cenchrus ciliaris, Enneapogon cenchroides, Pogonarthria squarrosa, Schmidtia pappophoroides, Stipagrostis uniplumis, and Urochloa spp. (Low and Rebelo 1996, Smith 1998, Wild and Fernandes 1967).

The eastern and northeastern areas of the ecoregion contain White’s (1983) north Zambezian undifferentiated woodlands and wooded grasslands. Here, drier riparian woodlands grow on alluvium with large trees frequently exceeding 20 m, and communities of mostly secondary woodland grow on fertile, well-drained, and slightly basic soils at elevations intermediate to the river valleys and uplands (White 1983). This floristically diverse community is distinguished by a lack of dominant species representative of mopane woodland types, and the various miombo communities (White 1983). Characteristic woody plants are Acacia spp., Albizia spp., Combretum spp., Adansonia digitata, Diospyros mespiliformes, Ficus sycomorus, Kigelia africana, Lonchocarpus capassa, Trichilia emetica, Xanthocercis zambesiaca, and Xeroderris stuhlmannii.

The south Zambezian undifferentiated woodlands and scrub woodlands form the southeastern part of the ecoregion, and are transitional between the Zambezian Center of Endemism and phytochoria to the south (White 1983). Soils range from sandy loams on crests, to well-structured, often sodic clays on the bottomlands, with black to red clays overlying basaltic or doleritic areas (Low and Rebelo 1996). Important woody constituents of these generally dense communities are Acacia gerrardii, A. nigrescens, A. nilotica, Combretum apiculatum, C. collinum, Dichrostachys cinerea, Kirkia acuminata, Peltophorum africanum, Piliostigma thonningii, Sclerocarya birrea, and Terminalia sericea (White 1983, Low and Rebelo 1996). Average canopy height within this type ranges from 7 m to 9 m (White 1983). The herbaceous component is variable: poorly developed in drier areas, and tall and dense where rainfall exceeds 600 mm (Low and Rebelo 1996). In drier areas, grass species such as Themeda triandra, Panicum maximum, Heteropogon contortus, Enneapogon cenchroides, and Urochloa mossambicensis figure prominently, while thatch grass species Hyperthelia dissoluta and Hyparrhenia hirta are important in moister areas (Low and Rebelo 1996).

Biodiversity Features
The flora of the Zambezian and Mopane Woodlands ecoregion is not characterized by high species diversity throughout its range, although White’s (1983) two Zambezian woodland types mapped within this ecoregion are considered floristically rich. As many as 2,000 vascular plant species have been recorded from South Africa’s Kruger National Park (19,624 km2) in the southeastern portion of the ecoregion (The Peace Parks Foundation 2000a). However, plant species richness rarely exceeds 283 species per 625 km2, and only occasionally exceeds 614 species/625 km2 (Stalmans and Emery 1999). While greater plant diversity may occur in the Zambezian woodland component of the ecoregion, the mopane tree characterizes the entire ecoregion, and in many places dominates to the exclusion of other species, particularly trees (White 1983, Wild and Fernandes 1967). Mopane trees are ecologically important as browse for numerous animals, notably elephants (Coates-Palgrave 1983, Funston 1993), and economically the wood is prized for building and fuel (Liengme 1981, Grundy et al. 1993). In addition, the tree is the major host for the seasonally abundant mopane worm (Gonimbrasia belina), the larval stage of a moth which is characteristic of the mopane woodlands (Pinhey 1978). The mopane worm is an important human food and economic resource (Liengme 1981, Cunningham 1996). Other important taxa in the ecoregion are the families Combretaceae and Mimosaceae, which are represented by 34 and 56 tree and shrub species respectively (Coates-Palgrave 1983). The extreme south of the ecoregion contains the critically endangered endemic cycads Encephalartos heenanii and E. paucidentatus, which are largely confined to Songimvelo Nature Reserve. The ecoregion is also home to several of the known remaining populations of the medicinally important and severely over harvested perennial herb, wild ginger (Siphonochilus aethiopicus) and the pepperbark tree (Warburgia salutaris) (Cunningham 1988).

The Zambezian and Mopane Woodlands are significant from an evolutionary perspective, because the Trans-Botswana transition belt – the changeover zone between the tropical and subtropical biomes – broadly corresponds to the mopane vegetation in the southern part of the ecoregion (Endrödy-Younga 1978). This belt has played an important role in faunal evolution, as various taxa representative of one biome or the other have dispersed through this zone to speciate on the other side (Endrödy-Younga 1978).

This ecoregion is one of the most important areas for vertebrate diversity in southern Africa, particularly for mammals (The Peace Parks Foundation 2000a, Turpie and Crowe 1994). The biota and associated natural processes remain largely intact as a result of the extensive and well-maintained system of national parks and reserves in the ecoregion (Huntley 1978). Vegetation here is more nutritive than surrounding ecoregions with higher rainfall, and as a result, the area is well known for supporting large concentrations of ungulates (Mills and Hes 1997, Huntley 1978). This includes some of the most significant remaining populations of the critically endangered black rhino, the endangered elephant (Hilton-Taylor 2000), as well as white rhino (Ceratotherium simum), hippopotamus (Hippopotamus amphibius), buffalo (Syncerus caffer), blue wildebeest (Connochaetes taurinus), giraffe (Giraffa camelopardalis), kudu, and nyala (Tragelaphus angasii) (Stuart et al. 1990). The Zambezian and Mopane Woodlands can be clearly distinguished from moister savannas represented by miombo woodlands based on differences in their faunal assemblages: species such as side-striped jackal (Canis adustus), sable antelope (Hippotragus niger), roan antelope (Hippotragus equinus), and Lichtenstein’s hartebeest (Alcelaphus buselaphus licthensteini) are associated with the miombo, while the black-backed jackal (Canis mesomelas), kudu (Tragelaphus strepsiceros), and impala (Aepyceros melampus) are identified with the Zambezian and Mopane Woodlands (Huntley 1978).

Although large blocks of this habitat remain, in many areas natural migration routes have been restricted by manmade obstacles, such as the western boundary fence of Kruger National Park and the cattle and veterinary fences in northeastern Botswana. These restrictions on migration have particularly affected the blue wildebeest (White 1989, Stuart et al. 1990, Huntley 1978). The majority of the southern African populations of Lichtenstein’s hartebeest are contained within the Luangwa Valley, Kruger National Park, and Gonarezhou National Park (Stuart et al. 1990). Sharpe’s grysbok (Raphicerus sharpei), a little known, probably rare antelope, is well represented in this ecoregion (East 1998), where it favors dense mopane vegetation (Mills and Hess 1997).

Predators are also abundant, and the full assemblage of lion (Panthera leo), cheetah (Acinonyx jubatus), spotted hyena (Crocuta crocuta), and leopard (Panthera pardus) is found in a number of the ecoregion’s large protected areas, mostly notably Kruger National Park and its adjoining private reserves. Other important protected areas include the national parks and game management areas of the Luangwa and Zambezi Valleys, and Chobe National Park and Moremi Game Reserve in Botswana (The Peace Parks Foundation 2000a, Stuart et al 1990). The endangered wild dog (Lycaon pictus) is found in significant numbers within the protected areas of the ecoregion (Stuart et al 1990). Chobe National Park is one of the main breeding sites for the rare slaty egret (Egretta vinaceigula, VU), and the eastern population of the white stork (Ciconia ciconia) uses the Luangwa Valley as its wintering ground (Stuart et al. 1990, Harrison et al. 1997).

Although the Zambezian and Mopane Woodlands are rich in vertebrate species, they tend to be poor in endemics (Crowe 1990, Pinhey 1978). Only five birds can be considered near-endemics to the ecoregion: Lilian's lovebird (Agapornis lilianae), black-cheeked lovebird (Agapornis nigrigenis), pink-throated twinspot (Hypargos margaritatus), Chaplin's barbet (Lybius chaplini), boulder chat (Pinarornis plumosus), and lemon-breasted canary (Serinus citrinipectus). One mammal species, Juliana’s golden mole (Amblysomus julianae), is near-endemic. Two endemic ungulate subspecies, Cookson’s wildebeest (Connochaetes taurinus cooksoni) and Thornicroft’s giraffe (Giraffa camelopardalis thornicrofti), are confined to the Luangwa Valley (Stuart et al. 1990, East 1998). The ecoregion contains higher reptile endemism, with strict endemics including Lang’s worm lizard (Chirindia langi), collard flat lizard (Platysaurus torquatus), and Sabi quill-snouted snake (Xenocalamus sabiensis).

Elephant browsing activity and fire are the two major natural factors shaping the vegetation and associated fauna within the Zambezian and Mopane Woodlands (White 1983, Trollope et al. 1998). Elephants crop the larger trees in savannas and woodlands, creating openings exploited by grasses, thus increasing fire frequency and intensity (Smith 1998, White 1983, Trollope et al. 1998). This interplay between fire and elephants normally results in an open, two-tiered savanna, consisting of large trees interspersed with shrubs at varying stages of growth (Smith 1998, Trollope et al. 1998).

Current Status
The Zambezian and Mopane Woodlands enjoy a healthy conservation status. The poor agricultural potential of the region means that the majority of habitats are still relatively intact (Huntley 1978). Some land transformation has occurred, especially in the extreme south of the ecoregion, where dense human populations border Kruger National Park in South Africa. In these areas, as much as 43 percent of the land has been changed by agriculture and settlement, while livestock grazing and resource-use activities heavily impact the bulk of the remaining natural habitat (Peel and Stalmans 1999). Aside from the southeastern portion of the ecoregion in South Africa and Swaziland, the majority of Zambezian and Mopane Woodlands occur in areas of low human population density (The Peace Parks Foundation 2000a, Murphree 1990 as cited in Els and Bothma 2000).

The agricultural marginality of the Zambezian and Mopane Woodlands and the large attendant mammal populations have encouraged the establishment of an extensive protected area network in the ecoregion (Huntley 1978). Government conservation areas protect over 40 percent of the ecoregion with private game ranches, nature reserves and conservancies in South Africa, Zimbabwe, and Botswana adding a further 5 to 10 percent to the total area conserved. The most significant national parks are Kruger in South Africa, Gonarezhou in Zimbabwe, and Banhine, Gorongosa, and Zinave National Parks in Mozambique. These parks cover much of the large southeastern portion of the ecoregion.

Protected areas in this southeastern portion are scheduled to increase threefold by 2003, with the opening of the 95,700 km2 Gaza-Kruger-Gonarezhou Transfrontier Conservation Area (TFCA), which will join four existing national parks and their intervening lands in South Africa, Mozambique and Zimbabwe (The Peace Parks Foundation 2000a). The Dongola/Limpopo Valley TFCA is another cross-border national park, which will span 4,900 km2 of South Africa, Botswana, and Zimbabwe (The Peace Parks Foundation 2000b). Other important conservation areas in the ecoregion are the North and South Luangwa National Parks and their surrounding Game Management Areas in the Luangwa Valley, as well as the Zimbabwean and Zambian national parks and game management/safari areas in the Zambezi Valley. Chobe National Park and Moremi Game Reserve conserve a large portion of the ecoregion in Botswana.

Types and Severity of Threats
The most widespread threat to the ecoregion is poaching and exploitation of wildlife (Stuart et al. 1990). Black rhino and wild dog are species of special concern. Black rhinos are still threatened by demands for rhino horn products and wild dogs are often destroyed by livestock farmers, who perceive them as pests (Stuart et al. 1990). In many areas of the ecoregion, poaching is rife due to poor levels of protection provided by understaffed local authorities, particularly in Zambia and Mozambique (IUCN 1992). However, great efforts have been made in the past few years to rejuvenate and expand many of Mozambique’s protected areas (The Peace Parks Foundation 2000a), so an improvement in the quality of wildlife protection is likely.

Land transformation and degradation through agriculture, settlement and livestock grazing poses some threat to the ecoregion, particularly in South Africa and Swaziland, where population densities are as high as 174 persons per km2 (Els 1996) and large-scale agricultural plans have been introduced (Stalmans and Peel 1999). In the near future, steadily growing populations (particularly those bordering Kruger National Park) could force the South African government to cede portions of the park and other protected areas to communities demanding space and resources (Els and Bothma 2000). The Zambezi Valley portion of the ecoregion in Mozambique may also be at risk from the steady influx of people and development as stability returns following the civil war. The cattle industry in Botswana threatens wildlife populations, as ranching activities supplant indigenous ungulates, destroy predators, and cattle and veterinary fences impede the movements of migratory mammals (Stuart et al. 1990). Illegal livestock grazing, settlement in protected areas, and uncontrolled bush fires are all threats to the ecoregion in Zambia (IUCN 1992), as well as the overuse of natural resources exacerbated by a declining economy (NESDA 2000). Another concern is the potential habitat destruction caused by uncontrolled elephant populations in some parts of the ecoregion, particularly in Botswana and Zambia (Stuart et al. 1990, IUCN 1992). Culling and translocations are used to regulate elephant populations within protected areas and research into immunocontraception has also been undertaken.

Invasive alien plants are posing an increasing threat to the ecoregion. Current data from the southeastern portion of the ecoregion show that alien plants cover 0.1 to 5 percent of the entire ecoregion in South Africa and Swaziland, with alien cover exceeding more than 20 percent in places (CSIR, undated). Among the more prolific invaders are the shrub and tree species Lantana camara and Melia azederach, cactii of the genus Opuntia, and the water weeds Salvinia molesta and Eichornia crassipes. Invasive plants are supplanting indigenous vegetation and destroying faunal habitats, as well as altering hydrological and nutrient cycles (CSIR, undated; IUCN 1997/1998).

The most immediate threat to the ecoregion is the present land invasion crisis in Zimbabwe, in which a large percentage of private farms have been occupied since the beginning of 2000. Zimbabwe’s private conservation industry has been particularly affected, notably the large Save Valley and Chiredzi Conservancies in southeastern Zimbabwe near Gonarezhou National Park (Sharman 2000). The land invasions have coincided with a sharp increase in poaching, which have already caused huge losses to wildlife, as well as the application of slash-and-burn farming methods to areas unsuitable for agriculture, particularly in the mopane woodlands and scrub woodlands (Sharman 2000). Community conservation initiatives, such as the CAMPFIRE program, are also reported to have collapsed in the areas where land invasions have occurred (Sharman 2000).

Justification of Ecoregion Delineation
This ecoregion defines the eastern mopane woodlands of the larger Caesalpinoid woodland complex of southern Africa. This ecoregion, particularly from the Okavango to Lake Malawi, reflect White’s (1983) ‘Colophospermum mopane woodland and scrub woodland’ and portions of the ‘North Zambezian undifferentiated woodland.’ It is separated from surrounding ecoregions by its lower elevation and rainfall, and is characterized by the dominance of the tree Colophospermum mopane (Caesalpiniaceae), which is the sole canopy species throughout much of its range (White 1983; Wild and Fernandes 1967). The southern boundary diverges from White around the Limpopo River Valley to delineate the higher elevations of Southern Bushveld ecoregion. The southern border of this ecoregion thus encompasses a portion of White’s ‘Northern Zambezian undifferentiated woodland’ stretching around the Limpopo River, towards a section of ‘South Zambezian undifferentiated woodland’ and ‘Transition to Tongaland-Pondoland bushland undifferentiated woodland’ into Swaziland.

This ecoregion is part of larger complex of Caesalpinoid woodland ecoregions that support wet and dry miombo, mopane, thicket, dry forests, Baikiaea woodland, and flooded grassland habitats, among others. The dominance of Caesalpinoid trees is a defining feature of this bioregion (i.e., a complex of biogeographically related ecoregions). Major habitat types (e.g., mopane and miombo) and the geographic separation of populations of large mammals are used to discriminate ecoregions within this larger region. All of these ecoregions contain habitats that differ from their assigned biome or defining habitat type. For example, patches of dry forest occur within larger landscapes of miombo woodlands in several areas. More detailed biogeographic analyses should map the less dominant habitat types that occur within the larger ecoregions.

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Prepared by: Lyndon Estes,Leticia Greyling
Reviewed by: In progress

 

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