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Invasive Species in Canada

What we can do to help

  • we can become more knowledgeable about them and share our knowledge so others can benefit from it
  • we can always be careful to watch out for these species to see how fast they could affect our ecosystem
  • we can try to limit the spread of these species

Invasive Plants

Purple Loosestrife:

  • native to Europe and Asia
  • traveled through ship ballasts
  • roots take up room and decrease living area for animals
  • they are too tall and they clog up irrigation pipes

Water Chestnut:

  • native to Europe,Africa and Asia
  • was purposely introduced
  • have sharp spines which cause cuts
  • let minimum light through to underwater organisms

Invasive Invertebrates

Zebra/Quagga Mussels:

  • freshwater bivalves native to Black Sea

What are Invasive Species?

  • introduced in late 1980s by ballast waters ships carrying larvae,,juveniles, or adult mussels

Invasive Fish

  • multiply very quickly and clog things up
  • •impact fish by growing toxic algal blooms

Goldfish:

Spiny/Fish hook waterflea:

  • small aquatic predators native to Eurasia
  • native to eastern Asia
  • brought to Great Lakes when owners dumped unwanted pets
  • eat native species and disrupt food chain
  • may produce large populations
  • carry diseases such as Koi Herpesvirus
  • introduced to Great Lakes in ballast water from ocean-going ships.
  • reduce food supplies for small fish because they eat zooplankton
  • easily spread and multiply very quickly
  • any types of organisms that were brought to another ecosystem
  • brought accidentally or purposely. (usually by humans)
  • usually cause harm to the ecosystem but can sometimes have a positive effect as well
  • in the U.S are called "An alien species"
  • usually, government of the area would spend tons of money to get rid of pest

Rainbow Smelt:

  • native to coastal regions and few lakes
  • came to great lakes through Erie Canal
  • habits can disrupt food chain by feeding on zoo-plankton and other native species
  • when eaten they cause fish to become contaminated

Invasive Parasites

Koi Herpesvirus:

  • a fish virus; affects only carp, koi, and goldfish
  • fish can die in hours but does not affect humans
  • came to Ontario waters through fish trade
  • the bacteria is in fresh waters
  • reduces fish population

Sea Lamprey:

  • considered as fish and parasites
  • an eel-like fish native to north Atlantic Ocean
  • invade Great Lakes through ship canals
  • suck blood of fish reducing fish population
  • During parasitic phase, can destroy 18 kg fish

Impacts of Invasive Species

  • Some of these species can hurt or sicken humans
  • They can bring diseases
  • They ruin the food chain
  • They may cause extinction of native species
  • Most invasive species have no predators so they multiply
  • most can multiply quickly
  • can take away shelter of animals or humans
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