Size structure analysis of the dominant trees in a South African savanna.
The population dynamics of Burkea africana, Terminalia sericea, Combretum molle, Sclerocarya birrea ssp. caffra, Acacia tortilis ssp. heteracantha and A. nilotica ssp. kraussiana in the Nylsvley savanna were inferred from their present size structures. Apart from S. birrea ssp. caffra, the species show approximately stable age structures. Reduced numbers in some size classes indicate that the population of mature trees in the future will fluctuate, regardless of future conditions. S. birrea ssp. caffra has a markedly unstable structure, with no immature trees and no evidence of successful regeneration.