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Warm-up 2/21/12:
What is the difference
Get out your Projects!
Essential Question
• What happens when humans introduce a
new species into an area?
What Are Native Species?
• Native species are those that normally live
and thrive in a particular community. They
occupy specific habitats and have specific
niches in their native environment. They
have natural predators that help to keep
their populations in check.
What Are Non-Native Species?
• Species that
migrate into an
ecosystem or are
deliberately or
introduced into an
ecosystem by
What are Invasive Species?
• A species introduced into an environment
that is able to outcompete and displace
the native species
Africanized Honeybee (Killer Bees)
• 1957 African honey be crossed with native
honey bee to produce an overly aggressive
bee in Brazil which escaped.
• Displaced the native honeybee through
competitive exclusion and migrated
northward at a rate of 200 miles per year.
• Northward migratory rate slowing down
due to climate (frost).
• Will global warming allow their migration to
move northward over time?
• Problems: They are so aggressive, they
not only out-compete native bee
populations, but pose great health threats
to humans.
Geographic Distribution of
Africanized Honey Bees in USA
Fire Ants
• Late 1930’s introduced by accident in Alabama
in shiploads of lumber and cargo.
• Interspecific competition reduced native ant
species by 90%!
• Fire ants are very aggressive and through direct
combat reduced native species.
• Since there are no natural predators, they
produced more colonies than native ants and
increased their population density significantly in
Fire Ants
• Interference Competition – fire ants consumed
food and invaded habitat of native ant species
(competitive exclusion principle).
• They release sulfuric acid when they bite and
can kill deer fawn, lizards, birds, livestock, pets,
and human babies.
• Fire ants have invaded trucks and caused
roadside accidents when drivers have been
• Chew through underground cables and disrupt
electric and phone service and have started
electrical fires in the south.
Fire Ants
• They are pesticide resistant
(Directional Natural Selection
of r-strategists)
• USDA (US Department of
Agriculture) has introduced a
non-native parasitic fly that
deposits eggs on the fire
ants. When the larvae
develop, they eat the heads
of the fire ant. CHAOS!
Fire Ant Distribution in the USA
(Degrees Celsius)
What does the Competitive
Exclusion Principle Say?
• No two species can occupy the same
“niche” at the same time.
• A “niche” is the role an organism plays in
the Ecosystem. (It’s job!)
Article Jig Saw
• Each group will do a case study on a
different invasive species.
• Job 1- read the article aloud- highlight
important information
• Job 2- fill in the graphic organizer with
information concerning your invasive
• Job 3- Take Cornell Notes on your article
• Job 4- Make note cards about your article
• Job 5- Create a graphical representation
of your article
Important Information
Country of Origin
Current Distribution
Method of introduction
Native Species it is affecting
Method of control