Transcript - PlanbookConnect

Cool organism of the day…
Megalodon
•The largest shark to ever live
•67 feet long and 103 tons
•Lived approx. 25 to 1.5 million years ago
Topic 7 – The Sixth Extinction?
Pg. 66 - 72
• In the last 600 million years there
have been five major declines in the
Earth’s biodiversity.
• The rate of extinction has been
about one species per year over
the history of the planet.
• Today the rate of extinction is
closer to 70 extinctions per day!
• As the rate of extinction increases,
the scales are tipping to an overall
trend of decreasing biodiversity
Over 963 000 species of
insects and other small
organisms!
Human impacts on biodiversity
• How do
human
actions
impact
biodiversity?
Extirpation
• The extinction of a species in a
specific location (localized)
• Examples: grizzly bears, Indian elephant,
Bengal tiger, pandas
Where have the grizzlies gone?
Disappearing Habitats
• Some areas of the world support greater
biodiversity than others.
• One of the largest causes of extinction
has been human interference and the
loss of habitat.
Bioindicator Species
• The population of this species is an
indication of the health/condition of that
ecosystem.
• It is usually an animal on the top of a
food chain. (carnivore)
• Some Bioindicator species include:
–Grizzly bears, wolves
Population Explosion
• As the human population is increasing
there is more need for food and
farmland.
• The burning and destruction of the
rainforest is the largest loss of habitat
and cause for extinction.
• In 2009 the world population reached 6.8
billion.
How high can it go?
Extinct Animals:
a species no longer existing
• Wooly mammoth – hunted to extinction
10,000 years ago
Extinct animals
• Passenger pigeon
– went from being
world’s most abundant
bird to extinction in less
than 100 years! In the
1800’s, hunters killed
about 5 billion
passenger pigeons!
Extinct animals
• Dodo - extinct in the mid 1600s
Extinct animals
• Quagga – hunted to extinction in the 1880s
Endangered Species or Species at Risk
• species that has a low population or loss of
habitat
• is in danger of becoming extinct
• Examples:
–Panda, tiger, whooping crane,
burrowing owl
Whooping cranes
Topic 8 – Pains and Gains
Pg. 73 - 78
• What can we do to stop or
slow down the decline in
biodiversity?
Role of Zoos
•
•
•
•
provide education and information
supports research
captive breeding program
protects endangered species
Calgary
zoo
Seed Banks
• collect samples of seeds to
protect diversity
Global Effort
• Global treaties have been drawn up
to protect endangered plants and
animals
• National parks and wildlife refuges
are created.
CITES
• Convention on International Trade of
Endangered Species
• International laws are established to
prevent the import or export of
endangered plants or animals or animal
products.
• It is illegal to buy or sell animal parts.
Review – key terms
• Extirpation
• Extinct
• Bioindicator species
• Seed banks
• Global treaties
Extirpation
• Grizzly
• Panda
• Tiger
• Raven
• Indian elephant
Check your understanding
• Answer questions 1 – 10 about
topics 7 & 8
• Quiz on topics 7 & 8
tomorrow