Oregon Most Invasive Species

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Have you seen these critters?

• Feral Pigs
• Nutria
• Mute Swans
• English Ivy
• Oriental Weatherfish
• Gypsy moth
• Bullfrog
• Starlings
• Mud Snails
• Purple loosestrife
• Scotchbroom

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Feral Pigs

• Escaped or released
• domesticated gone wild.
• Soil erosion reduction of
• forest regeneration
• Disease transmission to
• wildlife, livestock, humans
• Transport weed seeds

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Nutria
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• Invasive rodent species w/ orange teeth
• Destroy habitat.
• Cause erosion
• Dont feed nutria
• Disease and aggression

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Mute Swans

• Native to Europe Asia
• Ashland in 1921
• Deschutes River in 1940s.
• Grew from 4 to 56 between 1985 1995
• Pop control reduced again
• compete w/ native birds
• attacks on kids pets
• challenging jet skiers

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English Ivy

• Fast growing, few requirements
• Create monocultures
• Ruin habitat for native wildlife
• Destructive roots
• shoot out attach to anything

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Oriental Weatherfish

• Popular bait fish
• Aquarium fish
• Still or slow moving, shallow waters
• Burrow into mud-bottom
• Inhabit ponds and lakes poor in oxygen
• Can absorb atmospheric O2

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Gypsy Moth

• Native to Asia/Europe
• 1869 brought over for silk
• Lay eggs on anything
• Love Oak, but eat many trees bushes
• Defoliation of trees
• Traps spraying

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Bullfrog

• Native to Eastern/Central US
• Accidentally introduced during trout stockings
• Introduced through aquarium trade and for sport
  and pest control
• Travel 2 km to find new habitat
• Introduced Bluegill fish eats dragonflies which
  eat Bull frog larvae.
• Eat Western pond turtles and just about anything
  they can get into their mouth!
• Bad for wetland diversity

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European Starlings

• Native to Eurasia Africa.
• New York in 1890 by
• Shakespeare fan
• 140 million birds in 1994
• Pest destructive to grains,
• fruit crops, livestock feed
• Affect cost of dairy, egg and
• poultry
• Droppings cause stains
• damage cars stored goods
• Noisy
• Carry mites

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Mud Snails

• Native to New Zealand
• 1/8 inch long or smaller
• Wide tolerance in water temp
• Live days out of water on gear
• Reproduce by cloning, only need one
• Population ½ mill in 1 square yard
• Out-compete native bottom dwelling insects,
  impact fisheries.
• Trout fishermen
• Scrub gear with a brush, disinfectant
• Freeze waders overnight!
• Boil waders for 5 min. _at_ 130 F.

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Purple Loosestrife

• Native to Europe Africa.
• Introduced to US as ornamental
• Used to stabilize roadcuts.
• Seeds survive for 80 yrs.
• Seeds stick to everything
• Seeds carried via runoff from roads into streams
• Makes fields over six ft. tall.
• Diminish habitat for grazing animals, like the
  native Elk.
• Shade out and kill native grassland plants
• Encroaching on farmers' crops and pasture land.

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Scotch broom

• Benton County in 1892.
• Biological control agents 3 insects released to
  eat
• Displace native plant species
• 47 million annually in lost timber.
• Invades disturbed sites, natural areas, dunes and
  forest lands.
• Prolific seed producers
• Seeds long-lived (50 yrs)