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Transcript
Warm-up 2/21/12:
What is the difference
Biomagnification
Bioaccumulation
Get out your Projects!
Essential Question
• What happens when humans introduce a
new species into an area?
NON-NATIVE SPECIES
A MODERN-DAY CAUSE OF
COMPETITION AND
EXTINCTION
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
accidentally
introduced into an
ecosystem by
humans.
What are Invasive Species?
• A species introduced into an environment
that is able to outcompete and displace
the native species
• http://www.youtube.com/watch?v=u9cmA
Rsp-BE&feature=related
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
south.
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
attacked.
• 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