While Stevenson-Hamilton believed in 'a balance of Nature', evidence suggests that the natural environment is never in a constant state of equilibrium, and is continuously influenced by weather patterns, fire and fluctuating wildlife populations. Nature is therefore never in a balance, or at least not in the way that humans interpret the term. In the past the Park's biologists sought to manage the system in such a way that fluctuations in wildlife populations were minimised - however, certain management policies were to have a major impact on some species.
Where Stevenson-Hamilton had relied on intuition and experience in managing the Park, the 1950s saw the emergence of a corps of scientists, reliant on scientific methods and statistical analysis, that would dominate the management of the Park for more than 40 years.
Under scientific management it was argued that because the Kruger Park was entirely surrounded by a game-proof fence, constant and careful management was necessary. Not only was the veld burnt at regular intervals, and other fires actively discouraged, but wildlife populations were carefully monitored by conducting an annual census that took over three months to complete.
In 1972, Dr U de V Pienaar wrote, 'the Board is trying, by means of the skillful supply of water and scientific control of grazing, to build up the numbers of all herbivorous animals to an optimum level ... considerable numbers of wildebeest and zebra are being captured in the overpopulated areas of the central district and transferred to the underpopulated areas south of the Sabie River.'
The frequent occurrence of droughts, and the bad press that this generated, was addressed by 'Water for Game' campaigns, which raised substantial sums of money. More than 300 windmills and 65 major dams were constructed, often in areas where no natural water had occurred historically. In the Southern Region alone 22 windmills and 11 dams were constructed from 1960-1971. The water provision programmes allowed water-dependent species such as zebra and impala to increase.
An increase in zebras alters the nature of grasslands and allows lions to colonise vacant territories, thus contributing to the decline of rare antelope such as sable, roan, reedbuck and tsessebe. These antelope require very specific habitats, inhabiting open woodlands and grasslands in prime condition. In the Central Region, 12 new lion prides have become established since the 1950s in areas where artificial water points were provided.
Because water-dependent species thrived as a result of the water provision programmes, scientists then argued that it was therefore necessary to cull elephant, hippo, buffalo, zebra, wildebeest and impala.
A census in 1967 counted 6 586 elephants, and park biologists decided to limit the population to 7 000. Culling of elephant and buffalo commenced in the same year. In time, the necessity for these programmes was questioned as a better understanding of the ecosystem emerged, and eventually all culling campaigns, with the exception of those for elephant, were abandoned.
In March 1999 a revised management plan was approved. Central to the plan is a clear Mission Statement which is: 'To maintain biodiversity in all its natural facets and to provide human benefits in keeping with the mission of the South African National Parks in a manner which detracts as little as possible from the wilderness qualities of the Kruger National Park.'
Two high impact zones have been established, covering 40 per cent of the Park. One extends from just south of Tshokwane up to the Crocodile River, and the other extends from west of Satara Camp up to near Mopani Camp. Elephants will not be culled or captured in these high impact zones for the foreseeable future.
Finally, there are two low impact zones, one extending from the Olifants River to just south of Tshokwane; and the other from Mopani Camp to the edge of the botanical zone around Punda Maria. The low impact zones cover 45 per cent of the Park, and in these areas elephants will be reduced by seven per cent per year by live capture or culling until certain habitat criteria have been met.
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