Transcript Tuesday, May 30th, 2006 Aim: How does biological

9/26/14
Objective: How are humans
impacting biodiversity?
Do Now: What is the difference between a
threatened and endangered species?
(Finish video clip)
http://www.youtube.com/watch?v=XWBzwt
VXzXc
Endangered
• Endangered in immediate danger
of extincition .
Threatened
• A species that is likely to become
endangered if it is not protected.
What is the #1 cause?
• Habitat destruction leads to species
endangerment
What is biodiversity?
• Biodiversity: the total of genetically different
organisms in an area
A lot of biodiversity: Rainforest
What is biodiversity?
• Biodiversity: the total of genetically different
organisms in an area
litte biodiversity: corn field, desert
How might low biodiversity effect the
stability of an ecosystem?
Levels of Diversity
• Species diversity: # of different species in an area
• Ecosystem diversity: the variety of habitats,
communities within an ecosystem
• Genetic Diversity: different genes within a population
Importance of Biodiversity
Keystone Species
• Keystone species: a species that has a major
impact and role within an ecosystem. Without
them the ecosystem will fall apart.
– Sea otter
(Decrease Sea Otter  Increase sea urchinDecrease Kelp- Decrease Fish spawning
http://www.youtube.com/watch?v=D3W4OCnHyCs (sea
urchin)
http://www.youtube.com/watch?v=5xE1bRt
l4aA (29 min)
Biodiversity Loss- Deforestation
• The clearing of land without replacing it
Hunting and Poaching
• Illegal trade of endangered animals
• Illegal poaching of animals for food, shelter,
trophies
Caspian Tiger- 1970 (Iran,
Afghanistan, Turkey)
Biological Magnification
DDT was eaten by
insects, washed into
soils and streams and
passed through food
webs.
Biological Magnification
What is biological magnification?
• Biological magnification: concentrations of
harmful substances increase through a
food chain/web
• DDT: harmful pesticide used during the
60s to kills insects that pray on crops.
(Planet in Peril- body burden)
Invasive Species
Invasive Species: Species introduced to a
non-native area.
http://www.youtube.com/watch?v=k3N5t70a
J2A
Why is biodiversity important?
• http://www.youtube.com/watch?v=HSaAlPRN-c
Activity
D = Douglas Fir
N= Noble Fir
C= Western Red Cedar
M= Vine Maples
H = Western Hemlocks
W= White Fir
L= Lodge pole pine
WP= Western White Pines
B= Bigleaf Maple
WD= Western Dogwood
Species and Population Survival
Lots of genetic diversity  more likely to survive
environmental change
Bottleneck Effect:
Population shrinks, genetic diversity decreases
Ethics, Aesthetics, and
Ecotorism
• Species have a right to exist
Ecotorism:
 Tourism created to support conservation
sustainable development of ecologically
diverse areas

Rainforests
 Coral reefs
 Tundra
Nonrenewable Resources
 Nonrenewable resources: resources that
cannot be replaced once they are used
 Examples: fossil fuels (gas, coal),
minerals (silicon), metals for packaging
 Using too many nonrenewable resources
will cause their depletion (reduction)
 Recall the Oil graphs
Renewable Resources
 Renewable resources: resources that
can be replaced
 Examples: food, water, solar energy
 Increased consumption can stress the
natural processes that renew some
resources
(ex. Fish)
Preserving our Resources
 How can we help maintain our supply of both
renewable and nonrenewable resources?
Reduce: avoid using resource (walk,
bike, carpool)
Reuse: Use product over and over
(dishes, paper bags)
Recycle: Discard in a way that it can be
used again
Exponential Growth
• Population increases with each generation
 Due to:
- an increase in food production
- an increase in hygiene
- an increase in medicine and technology
Carrying Capacity
• Carrying Capacity: the maximum population
an ecosystem can support.
Carrying Capacity is reached
when…
• A species consumes a particular natural
resource at the same rate at which the
ecosystem produces the resource
• Limiting Factors: can be sunlight,
water, food, space, mineral nutrients,
oxygen, etc.
Carbon Footprint
• The amount of
carbon emitted by
you in your daily
lives.