what is an invasive species? - mrs. logan...
TRANSCRIPT
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WHAT IS AN INVASIVE SPECIES?
• Invasive species are plants, animals, or other organisms that are introduced to a given area outside their original range and cause harm in their new home.
• Because they have no natural enemies to limit their reproduction, they usually spread and reproduce quickly.
• Invasive species are recognized as one of the leading threats to biodiversity and impose enormous costs to agriculture, forestry, fisheries, and other human enterprises, as well as to human health.
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TYPES OF INVASIVE SPECIES
•Animals
• Plants
• Pathogens (virus/bacteria)
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WHAT IS THE PROBLEM WITH AN INVASIVE SPECIES?
• Can cause an imbalance in the natural environment
•Outcompete native organisms for resources
• Threaten agriculture
• Endanger the health of plants and animals
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HOW DO INVASIVE SPECIES TRAVEL?
• Humans- Can simply carry a organism• Some invasive species can stow away on a ship or
plane.
• Wind- Seeds can be carried great distances
• Water- Organisms can be transported on
natural “rafts”
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SOME EXAMPLES OF INVASIVE SPECIES:
• Zebra mussel
• Kudzu
• Red fire ants
These three invasive species are found in Tennessee.
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ZEBRA MUSSEL
•Originally from the Caspian and Black Sea.
• Introduced to the Great Lakes in 1988.
• Can be found in Tennessee
• Cause many problems:
• Can harm other fresh water mussels
• Can block intake pipes for power plants
• Can cause problems for recreational activities
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Zebra Mussel
Zebra mussels
covering a crayfish
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KUDZU
• It is a climbing, coiling, and trailing vine native to
southern Japan and south east China.
• It occurs as an invasive species in the U.S. and is
found in Tennessee.
• It is considered a harmful weed that climbs over
trees or shrubs and grows very rapidly.
• Kudzu kills other plants due to its heavy shading
from the sun.
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KUDZU
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RED FIRE ANTS
• The red fire ant is an insect that originated in South
America and was accidentally introduced to
Alabama in 1930s. They reside in Tennessee as
well.
• Red fire ants are aggressive. They attack with
painful venom and chance of allergy.
• Red fire ants may also damage fruits, berries and
young crops.
• Red fire ant mounds are a hazard to farm
equipment and can damage electrical boxes.
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RED FIRE ANTS
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PREDATOR – PREYRELATIONSHIPS
What if kudzu was introduced to this food web and killed the
producers?