Influencing Factors
There are several factors that influence propagule pressure. They include size and frequency of the initial invasion, the pathway of invasion, characteristics of the species involved and the rate of the immigration (Groom, 2006). When studying propagule pressure one must ask the question; do these factors affect persistence independently or interact together? (Leung et al., 2004) The dynamics of the invasion are influenced by propagule pressure even after establishment has taken place. The carrying capacity of the nonnative species remains variable while adapting to their new environment.
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