Risks from Introductions
•Degradation
of host environment:
–Changes in vegetation
–Changes in water quality
•turbidity, DO, pH, temp., siltation, eutrophication
•Disruption
of host community:
–Competition
–Predation
–Stunting
•Genetic degradation of host
stock:
–Hybridization
•Introduction
of diseases and
parasites
•Spatial alterations
–Aggression
–Overcrowding
Source: Welcomme 1988; Taylor
et al. 1984
