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Alien Invaders!!

Alien Invaders!!. Impacts of Invasive Plant Species in Oregon Erin Tirone. Road Map. Definitions Examples of Invasive Species Description Impacts on native landscape Eradication Methods Pros/cons Questions. What does it mean to be…?. Native

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Alien Invaders!!

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  1. Alien Invaders!! Impacts of Invasive Plant Species in Oregon Erin Tirone

  2. Road Map • Definitions • Examples of Invasive Species • Description • Impacts on native landscape • Eradication Methods • Pros/cons • Questions

  3. What does it mean to be…? • Native • A plant or animal originating from a particular place or region • Endemic • Native to or confined to a certain region • Invasive • Marked by a tendency to spread • Tendency to intrude or encroach

  4. Why do plants become invasive? • “New” environment similar to native environment • Better competitors than the natives • Efficient adaptations • No natural predators in “new” environment • Opportunistic

  5. Himalayan Blackberry • Native to Eurasia, pervasive in Oregon • Spreads rapidly through underground growth and seed dispersal • Establishes itself in sunny disturbed areas

  6. English Ivy • Europe native • Spreads by extension of runners • Many negative impacts on plant and habitat diversity • Attempts at mitigation in Forest Park

  7. Reed Canarygrass • Native for Europe and Asia (though still being debated whether it is actually native to North America) • Spreads through rhizomes and seed dispersal

  8. Scotch Broom • Scotland native • Grows on open, sunny, disturbed sites • Produced enormous amount of seeds, which are viable for up to 80 years

  9. Japanese Knotweed • Introduced from Asia, perhaps as ornamental plant • Grows through rhizomes • Establishes itself in moist ravines, ditches, and disturbed areas

  10. Morning Glory • Eurasian native • Grow in disturbed areas, commonly found along waterways, fields and roadsides • Grow from rhizomes, are ground creepers

  11. Clematis • Common in disturbed open canopy areas • Spread through wind dispersal of seeds from wispy flowers

  12. Common Methods of Eradication • Pulling out the roots • Cutting canes (blackberry) • Soil solarization • Planting Native plants • Herbicide application • Spraying • Spot application

  13. Works Cited • Invasive and Exotic Species of North America. 2002. USDA Forest Service. http://www.invasive.org • Invasive Plants--A Guide for Dealing with Non-native Species. Beaverton, OR: Natural Resources Office, Tualatin Hills Park and Recreation District • Pojar, J. & A. MacKinnon. 1994. Plants of the Pacific Northwest Coast. Vancouver, B.C.: Lone Pine. • Reed Canyon Enhancement Strategy. Non-native Species Management. 2001. Portland, OR: Reed College. http://web.reed.edu • Taylor, R.J. 1990. Northwest Weeds. Missoula, MT: Mountain Press.

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