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  1. Invasive plants jobs Catalina Island Conservancy internships: June 25-August 17. Information at: www.catalinaconservancy.org Rocky Mountain Biological Laboratory (Gothic, CO) Invasive Plants intern: 40 hrs/week June 12-Aug 11 (8 weeks) Room and meals supplied Management and experiments on smooth brome and Canada thistle Applications reviewed March 1st, accepted until April 1st. Contact: Dr. Jennifer Reithel (jreithel@gmail.com)

  2. Invasive species impacts: reading • Strayer, D., V. Eviner, J. Jeschke, and M. Pace (2006). Understanding the long-term effects of species invasions. Trends in Ecology and Evolution 21 (11):645-651.

  3. Impacts

  4. Impacts • Some observations: • “Tens Rule” From Williamson & Fitter (1996) Ecology 77:1661-1666

  5. Impacts • Some observations: • “Tens Rule” From Williamson & Fitter (1996) Ecology 77:1661-1666 • Only ~10% of imported species escape to wild

  6. Impacts • Some observations: • “Tens Rule” From Williamson & Fitter (1996) Ecology 77:1661-1666 • Only ~10% of imported species escape to wild • Of species that make it to the wild, only ~10% become naturalized

  7. Impacts • Some observations: • “Tens Rule” From Williamson & Fitter (1996) Ecology 77:1661-1666 • Only ~10% of imported species escape to wild • Only ~10% of species that make it to the wild become naturalized • Of species that become naturalized, only ~10% become pests

  8. Impacts • Some observations: • “Tens Rule” From Williamson & Fitter (1996) Ecology 77:1661-1666 • Only ~10% of imported species escape to wild • Only ~10% of species that make it to the wild become naturalized • Only ~10% of naturalized species become pests

  9. Impacts • Some observations: • “Tens Rule” From Williamson & Fitter (1996) Ecology 77:1661-1666 • Only ~10% of imported species escape to wild • Only ~10% of species that make it to the wild become naturalized • Only ~10% of naturalized species become pests • Example: • 1000 imported species

  10. Impacts • Some observations: • “Tens Rule” From Williamson & Fitter (1996) Ecology 77:1661-1666 • Only ~10% of imported species escape to wild • Only ~10% of species that make it to the wild become naturalized • Only ~10% of naturalized species become pests • Example: • 1000 imported species • 100 escape to wild

  11. Impacts • Some observations: • “Tens Rule” From Williamson & Fitter (1996) Ecology 77:1661-1666 • Only ~10% of imported species escape to wild • Only ~10% of species that make it to the wild become naturalized • Only ~10% of naturalized species become pests • Example: • 1000 imported species • 100 escape to wild • 10 become naturalized

  12. Impacts • Some observations: • “Tens Rule” From Williamson & Fitter (1996) Ecology 77:1661-1666 • Only ~10% of imported species escape to wild • Only ~10% of species that make it to the wild become naturalized • Only ~10% of naturalized species become pests • Example: • 1000 imported species • 100 escape to wild • 10 become naturalize • 1 becomes pest

  13. Impacts • Some observations: • “Tens Rule” • Measuring impact is complex • What should be measured and how?

  14. Impacts • Some observations: • “Tens Rule” • Measuring impact is complex • What should be measured and how? • For individual plant, individual species, or multiple species?

  15. Impacts • Some observations: • “Tens Rule” • Measuring impact is complex • What should be measured and how? • For individual plant, individual species, or multiple species? • Over what time frame?

  16. Impacts • Some observations: • “Tens Rule” • Measuring impact is complex • Lack of comprehensive data

  17. Impacts • Ecological • Conceptual model: From Walker & Smith in Lukens & Thieret (1997) • Invasive species affect different community & ecosystem processes