Common invasive species traits include the following:
Fast growth
Rapid reproduction
High dispersal ability
Phenotype plasticity (the ability to alter growth form to suit current conditions)
Tolerance of a wide range of environmental conditions (Ecological competence)
Ability to live off of a wide range of food types (generalist)
Association with humans[18]
Prior successful invasions[19]
Typically, an introduced species must survive at low population densities before it becomes invasive in a new location.[20] At low population densities, it can be difficult for the introduced species to reproduce and maintain itself in a new location, so a species might reach a location multiple times before it becomes established. Repeated patterns of human movement, such as ships sailing to and from ports or cars driving up and down highways offer repeated opportunities for establishment (also known as a high propagule pressure).[21]