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Science 9
Lesson 9: Extinction
Unit A
84 mins
Reduction of Biological Diversity
As we as a species continues to grow we put a lot of stress onto Living things around us.
The disappearance of a species from the planet
Moa of New Zealand (Hunted)
SciShow Extinction
He disappearance of a species from a certain area
Grizzlies. Only found in the mountains… although
used to road to Manitoba.
Natural Causes of Extinction and Extirpation
Catastrophic events (Volcanic eruptions,
earthquakes, floods, fire)
Lack of food (due to overpopulation)
Overspecialization: Organisms with a very
narrow niche may become extinct if
conditions change
The panda, relies on bamboo too much
Bulletproof man shot… by an arrow
Human Causes of Extinction and Extirpation
Agricultural Development
Damming of Rivers
Pesticides, Herbicides and Fertilizers
Introduction of Non-Native Species: No
natural predators… out complete native
Over Hunting
Pg. 65 # 1,3,6
Domestic Cats in New Zealand
Passenger Pigeon, Bison
Reducing Out Impact on Biological Diversity
- Protected Areas: Parks, Nature Areas, Game
- Restoration Programs for Ecosystems and
Species: Programs to help bring a species
back from the brink
- Resource Use Polices: Laws
- Controlling the Introduction and Spread of
Exotic Species
Conservation of Genetic Material: Saving
genetic material for another day
Practice: Pg. 78 #1,3,6,7
Ferrets released on New Zealand to kill the
rabbits… they hunted the slower flightless birds
Freezing Sperm, Seed Banks, Zoos