Guidelines for use

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• Guidelines for use
• This presentation was created by staff of The
  Nature Conservancy's Wildland Invasive Species
  Team. It describes many of the consequences of
  non-native plant species invasions in wildlands.
  If you use this presentation unaltered, please
  include the first page which gives us credit for
  creating the presentation. If you alter the
  presentation, please note during your
  presentation (either verbally or by a slide) that
  your presentation is based on one created by our
  team.
• The images in this presentation were produced
  either by our team, were given to our team for
  our own use, or were provided for this slide show
  by www.invasive.org. They may be used in other
  presentations. However, anyone who wishes to use
  these images for other web sites or for
  publication must contact our program to discuss
  image rights.
• This slide can be removed before you present the
  show.

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Understanding the impacts of invasive plants in
natural areas

• John M. Randall
• The Nature Conservancy
• Wildland Invasive Species Team
• University of California, Davis
• http//tncweeds.ucdavis.edu
• May 2003
• - v. 1.1 -

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• "On a global basis...the two great destroyers of
  biodiversity are, first habitat destruction and,
  second, invasion by exotic species - E.O.
  Wilson

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1998-1999 Survey of The Nature Conservancy field
staff

• 110 TNC staff from 50 states responded
• 49 said INVASIVE PLANTS were among the top 3
  threats
• 84 said INVASIVE PLANTS were among the top 10
  threats
• Only 5 said INVASIVE PLANTS were not a problem
• 271 INVASIVE PLANT taxa were reported

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• WEED
• EXOTIC ALIEN NON-NATIVE NON-INDIGENOUSINVAS
  IVENOXIOUS

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• Conservation GoalsConservation Targets(What
  are you managing for?)

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• Ecosystem Level Impacts - Disturbance regimes
  (i.e. fires)
• - Hydrology
• - Geomorphological processes (i.e. erosion,
  sedimentation)
• - Soil chemistry (i.e. nutrients)
• Community and Population Level Impacts
• - Vegetation structure
• - Community composition
• - Resource competition
• - Negative impacts on native animals
• - Promotion of non-native invasive animals
• - Population reductions, eliminations
• - Reduced recruitment of natives (succession)
• - Hybridization with native species
• Positive Impacts
• Lack of Impacts

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Ecosystem Level Impacts

• Disturbance regimes (i.e. fires)
• Hydrology
• Geomorphological processes(i.e. erosion,
  sedimentation)
• Soil chemistry (i.e. nutrients)

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Community and Population Level Impacts

• Vegetation structure
• Community composition
• Resource competition
• Negative impacts on native animals
• Promotion of non-native invasive animals
• Population reductions, eliminations
• Reduced recruitment of natives (succession)
• Hybridization with native species

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Lack of Detectable Impacts
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• Guidelines for use
• This presentation was created by staff of The
  Nature Conservancy's Wildland Invasive Species
  Team. It describes many of the consequences of
  non-native plant species invasions in wildlands.
  If you use this presentation unaltered, please
  include the first page which gives us credit for
  creating the presentation. If you alter the
  presentation, please note during your
  presentation (either verbally or by a slide) that
  your presentation is based on one created by our
  team.
• The images in this presentation were produced
  either by our team, were given to our team for
  our own use, or were provided for this slide show
  by www.invasive.org. They may be used in other
  presentations. However, anyone who wishes to use
  these images for other web sites or for
  publication must contact our program to discuss
  image rights.
• This slide can be removed before you present the
  show.