More than 300 workers at the Kruger National Park (KNP) are set to go on strike, KNP said on Thursday.
"They have given us a notice that they will go on strike tomorrow [Friday] because of what they call salary disparity," said spokesman William Mabasa.
The notice was issued by the Commission for Conciliation, Mediation and Arbitration which registered 361 people as the total number who would not work.
Of these, 248 were rangers, sparking concern over the protection of of the animals from poachers, particularly rhino.
The park employs about 400 rangers out of around 2500 staff.
Mabasa said workers believed some employees got more money than others.
In a previous discussion, management explained that salary differences could be due to factors such as experience, or a longer term of employment.
Though the workers were union members, they were striking in their individual capacity and it was not yet clear whether they had resigned their union membership.
KNP had put contingency plans in place, which included using the SA National Defence Force, the police, and volunteer rangers.
Mabasa said visitors could continue with their plans to visit the park. (Sapa)
