1. Introduction and Extinction of Species in an Eco System
Zebra Mussel

2. Example of an ecosystem
Species Introduction
“Introduced species are species that have become able to survive and reproduce outside the habitat where they evolved or spread naturally.”
-United States Environmental Protection Agency
Example of an ecosystem

3. Example of an invasive species
Introduced Species
Species can be classified in two classes
1)Invasive
2)Non-invasive
Both types of introduced species are brought to a new environment by human activity, either accidentally or deliberately.
Example of an invasive species
:Zebra Mussels

4. Simpsons did it https://www.youtube.com/watch?v=3f5viRoaZNw

5. Definition of Non-Invasive Species
A non-invasive species is an organism that is not native to the ecosystem, but doesn't have any negative effects on the ecosystem.
Examples include peaches and tomatoes.  
Peaches originated in China, and Tomatoes originated in South America, but these plants are now grown worldwide, but still require human intervention to keep growing.

6. Definition of Invasive Species
An invasive species is an organism that is not native to the ecosystem, and has negative effects on the ecosystem.
Examples include the zebra mussel which originated in Russia, and are now found in rivers worldwide, and cause damage by clogging pipes and contaminating the water.
A colony of Zebra mussels that are attached to a larger mussel

7. What do invasive species do, anyway, and why do they pose such a threat
Invasive species cause harm to wildlife that is foreign to it. These species are new which causes them to be more aggressive. The new species may not have any predators, and their numbers will spread rapidly and uncontrollably, along with taking over an area. Native wildlife wont be able to protect it’s self against the new invasive species

8. New Zealand

9. Invasive species videos!

10. Extinction Definition
The death of a species. It is considered to be the death of the last member of the species.
The two types of extinction are:
Global Extinction
Local Extinction

11. Global Extinction Defined as the total disappearance of a species
Examples include the Dinosaurs and the Dodo, both of which are extinct worldwide.
Dodo Bird
Extinct dinosaur

12. Local Extinction
Defined as the disappearance of a species in a certain ecosystem, but the species lives in a different ecosystem.
 Local extinction can be fixed by replacing the missing organisms with the same species from other locations.
An example of local extinction is that saltwater crocodiles used to live in Vietnam, but are now extinct in that specific location.
Salt water crocodile

13. Effects of the Extinction of a Species
If a species is eliminated, it can cause many problems with the other trophic levels. For example, the species that it feeds on can become overpopulated and begin to die out, affecting the next trophic level, and so on.
This is called the cascade effect.

15. Practice

16. Questions
1) What is the definition of extinction?

17. The death of a species

18. What are the two types of Extinction

19. Global and local extinction

20. What are two examples of global extinction

21. Dinosaur and Dodo Birds

22. What is an example of local extinction

23. Salt water crocodiles

24. What are the two types of introduced species

25. Invasive and non-invasive species