Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Alien invasions in indigenous evergreen forest.

Abstract

The introduction to this paper gives a brief description of South African indigenous forests, which now occupy <1% of the land area, having been heavily exploited in the past. The paper goes on to review information relating to the potential for aliens to invade the indigenous forest under natural conditions, and under current land-use practices. Topics covered include: a history of forest disturbance by man, and of alien introductions (exotics, ornamental plants and animals - specifically feral pigs, Sus scrofa); the distribution of invasive species in forest habitats; the processes of invasion and its ecological impacts (establishment of indigenous trees under stands of aliens; dependence by aliens on forest disturbance; establishment of shade-tolerant alien plants in closed forest; invasion by creepers and scramblers; changed food plant preferences in frugivores and their potential effects on forest reproduction; and changes in wildlife ecology); the management and control of alien plants; and conclusions.