The following will be covered in the lesson:

1
The following will be covered in the lesson
Predict how an ecosystem will change as a result
of major changes in an abiotic and/or biotic
factor.
2
SUCCESSION

• Series of predictable changes that occur in a
  community over time.

3
Over time aquatic ecosystems fill in with
sediment and dead plant material creating a land
ecosystem.
4
A colony of beavers dam a stream, creating an
open pond in the forest, and the surrounding
trees die.
As these plants complete their life cycle and
die, they add to the accumulating organic matter
which is making the pond shallower.
Plants that like damp conditions thrive around
the margins of pond.
pond begins to dry out and pond-edge plants
(cattails and sedges) take over inside of dried
pond.
Around the ponds edges the plants are being
replaced by shrubs.
Finally, the shrubs are replaced by trees...
5
PRIMARY SUCCESSION

• Regular pattern of species replacement where
  nothing has lived before.

6
PIONEER SPECIES

• The first species to populate an area where
  succession is starting.
• Able to live in harsh conditions.
• Can grow in poor soil.

7
VOLCANO
When the volcano finishes erupting pioneer
species will slowly begin taking root on the
newly created mountain. This would be primary
succession since nothing has grown there before.
8
SECONDARY SUCCESSION

• Series of changes in an area where the ecosystem
  has been disturbed, but where soil organisms
  still exist.
• Occurs after disturbances such as fires and
  floods.

9
Clear Creek Fire, Salmon-Challis N.F./ 2000
10
This forest in Yellowstone is going through
secondary succession after wildfires burned
thousands of acres.