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Transcript
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.
Extinction
The disappearance of a species from the planet
Moa of New Zealand (Hunted)
SciShow Extinction
https://www.youtube.com/watch?v=FlUes_NPa6M
Extiration
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)
Disease
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
-
Urbanization
Construction
Agricultural Development
Logging
Damming of Rivers
Pollution
Pesticides, Herbicides and Fertilizers
Introduction of Non-Native Species: No
natural predators… out complete native
species
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
Preserves
- 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
instead
Freezing Sperm, Seed Banks, Zoos