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Conditions Which Enhance Invasive Potential
  • Conditions e.g. climate change that result in rapid growth biosec02 300 and early sexual maturity resulting in:
    • High reproductive output
    • High dispersal of young

  • Tolerance of a broad range of environmental conditions
  • High phenotypic plasticity and allelopathy (the ability to alter one's growth to suit current conditions)
  • Association with humans; in particular humans repeated patterns of movements from one location to another allow for species to have multiple opportunities for establishment (i.e. a high propagule pressure)
  • Where a species can manipulate its environment through chemicals or manipulation of abiotic factors, usually to make it less favourable for other species to compete.
    • Changes in fire regimes e.g. moorland management through burning, is another form of facilitation. Normal succession would favour certain native grasses but with the introduction of a species that can multiply and spread faster than native species, the balance is changed.(N and P are often limiting factors in this type of situation)
    • Habitat modification can also benefit other species e.g. zebra mussels increase habitat complexity and nutrition from waste products of filter feeding to increase the diversity and density of invertebrate communities

  • Disturbed landscape often prone to INNS with adverse effects on local ecosystems
  • Multiple successive introductions of different INNS can have interactive effects where the introduction of a second INNS can enable the first INNS to flourish
  • Invasive species can change the functions of ecosystems and if closely related to native species can hybridise with harmful effects even extinction of local species