BELL RINGER!
DEFINE THE FOLLOWING ON PAGE
11 OR 12
• PHOTOSYNTHESIS
• MUTUALISM
• COMMENSALISM
• PARASITISM
• CARRYING CAPACITY
• LIMITING FACTORS
How about the homework??
 Symbiosis
 Parasitism, mutualism, commensalism
 Cooperative
 Competitive
Succession
THE END OF UNIT II ECOLOGY!
Communities
 What is a community??
 Communities differ because…
 they have different combinations of biotic & abiotic factors

Climates differ…so organisms differ


Organisms are limited by resources available (limiting factors)


Examples??
Examples??
most organisms can live only within certain range of conditions
(range of tolerances)
Examples- lizard in cold environment!
Communities
 Communities
change over time
because…



Organisms can
change environment
so it’s unsuitable for its
continued survival
Examples?
The final, stable
community is the
“climax community”
Communities
 Succession – change in communities over time
Communities
Primary succession
Happens
where life has
never been before

Can you think of some examples?
Secondary succession
Happens
where life has
been before

Can you think of some examples?
Ecosystems
 Biomes – areas with similar climate, and therefore
similar organisms
 Can you name some biomes?
Environmental Changes
 Communities are affected by all sorts of changes to
their environments
 What are some examples of…



Geological forces
Cosmic forces
Biological forces
Human Impact on the Environment
 Deforestation

Using trees at rate higher
than can be replaced
Human Impact on the Environment
 Habitat destruction

Clear-cutting,
development, acid rain
Human Impact on the Environment
 Invasive Species

Kill off native species and
irreparably change habitat
Human Impact on the Environment
 Threats to biodiversity



Pollution & habitat loss
destroy organisms
Living things are
interdependent
Brings stability
Human Impact on the Environment
 Pollution



Burning fossil fuels; greenhouse
effect
Eutrophication of lakes from
pollutants
Acid rain
Human Impact on the Environment
 Ozone Depletion



CFC’s in atmosphere;
more UV hitting Earth
Global warming
Long-term catastrophic
effects
Group work page 18
 This is for a check
grade for the notebook
grade!
 Read the directions!