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=u9cmARsp-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