aim: what kind of negative impact does the introduction of invasive species have on the environment?...
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Aim: What kind of negative impact does the introduction of invasive
species have on the environment? Do Now:
What do you think the term “invasive species mean?”
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What is an invasive species? A non native species that becomes
established in a new new environment and out competes native species
Does anyone have an example of a invasive species?
Types of invasive species Animals Plants
Pathogens (bacteria)
What is the problem with an invasive species?
Uncontrolled population growthOut compete native organisms for food/space/resources
Endanger the health of other plants and animals.
How do invasive species travel? Humans
Wind Water
Humans- Can simply carry a organism.
Some invasives can stow away on a ship or plane.
Wind- Seeds can be carried great distances.
Water- Organisms can be transported on natural “rafts”
Examples of Invasive Species: Zebra mussel (Dreissena polymorpha) Giant Hogweed (Heracleum mantegazzianum) Asian Tiger Mosquito (Aedes albopictus) Lionfish (Pterois spp.)
Zebra Mussel(2)
Originally from the Caspian and Black Sea.
Introduced to the Great Lakes in 1988. Cause many problems:
Can harm other fresh water mussels Can block intake pipes for power plants Can cause problems for recreational
activities.
Zebra Mussel
Zebra mussels Covering a Crayfish
(3b)
Zebra Musselshowing bysall threads(3a)
Giant Hogweed(2)
Native to Eurasia Introduced to the United States in 1917. Originally used as an ornamental plant It out competes other plants for
resources. It produces a toxic sap.
Asian Tiger Mosquito(2)
Originally from Asia. Introduced to Hawaii in the late
1800’s. Continental United States in 1985.
Can be a vector for disease. Ex. West Nile Virus
Asian Tiger Mosquito (5)
Lionfish(2)
Native to the Pacific Ocean Introduced to the water around the
United States in 1992 through the aquarium trade.
Preys on native species. Has poisonous spines.
Lionfish (6)
Lionfish video (6)
What can you do?
1. Obey the rules. Do not transport
plants and animals when you travel.
2. Never release pets into the wild.
3. Learn about invasive species in your area for identification.
4. Use native plants.
Regents Question
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