Transcript Succession PPT - Clark

SUCCESSION
Look at these photos. What do you think would happen if
no one ever took care of the sidewalks? What would it
look like in 10 years? In 100 years?
#1.6 Aim:
How do
ecosyste
ms
change
over
time?
How do you get from THIS…
Agenda
QOD (10)
Lesson:
succession
(15)
Activity:
courtyard
scavenger
hunt (15)
Summary
Share (5)
HW #5
#1.6 Aim:
How do
ecosyste
ms
change
over
time?
To THIS…
Agenda
QOD (10)
Lesson:
succession
(15)
Activity:
courtyard
scavenger
hunt (15)
Summary
Share (5)
HW #5
#1.6 Aim:
How do
ecosyste
ms
change
over
time?
Succession – Series of changes in a community
over time
Agenda
QOD (10)
Lesson:
succession
(15)
Ecological communities progress over time.
Activity:
courtyard
scavenger
hunt (15)
Summary
Share (5)
HW #5
Why do you think the smaller plants appear first? (What do they do for
the larger plants?)
#1.6 Aim:
How do
ecosyste
ms
change
over
time?
Agenda
QOD (10)
Lesson:
succession
(15)
Activity:
courtyard
scavenger
hunt (15)
Pioneer species – the first
species
Summary to populate an area. These
Share (5) start making the soil
species
HW #5
Climax community – a
mature, stable community - what
the community would be like if
no disturbances ever occurred.
 Lichens and mosses are an
important pioneer species 
#1.6 Aim:
How do
ecosyste
ms
change
over
time?
Disturbances
Disturbances interrupt regular processes of
the ecosystem.
Agenda
QOD (10)
Lesson:
succession
(15)
Activity:
courtyard
scavenger
hunt (15)
Summary
Share (5)
HW #5
volcanic eruption – lava flow Humans clear-cut a forest
Depending on the type of disturbance, there can be 2 types of succession…
Primary Succession
• Succession that occurs on the surface where no soil
exists
– Example: volcano, glaciers, above ground
explosion
Secondary Succession
• Sequence of changes that takes place after an
existing community is disrupted
• When the disturbance is over, community
interactions tend to restore an ecosystem to its
original condition
– Examples: natural events – forest fires
– Examples: human activities - farming
• After a forest fire
Primary
Succession
Changing ecosystem
from scratch (no living
organisms)
Secondary
Succession
Changing ecosystem
from an existing
ecosystem (there are
living organism)
Which kind of succession
is it?
(primary or secondary?)
wildfire
#1.6 Aim:
How do
ecosyste
(primary
ms
change
over
time?
Which kind of succession is it?
or secondary?)
Agenda
QOD (10)
Lesson:
succession
(15)
Activity:
courtyard
scavenger
hunt (15)
Summary
Share (5)
HW #5
1st: Decomposers
feast on the
decaying meat
And what are the
pioneer
species? What is
the climax
community?
A gray whale dies, and
sinks to the otherwise
barren ocean floor…
#1.6 Aim:
How do
2nd: After a year, most of the whale tissue is eaten.
ecosyste
ms
supports
small fishes and other marine animals
change
over
time?
The carcass still
Agenda
QOD (10)
Lesson:
succession
(15)
Activity:
courtyard
scavenger
hunt (15)
Summary
Share (5)
HW #5
As the whale’s body decays, it enriches its surroundings with its
nutrients. This makes an oasis that attracts sediment dwellers of
marine worms.
#1.6rd Aim:
3 : When only the skeleton remains, heterotrophic bacteria begin to
How do
decompose the oils inside the whale bones, and support a diverse
ecosyste
ms
community
of mussels, worms, crabs, and clams.
change
over
time?
Agenda
QOD (10)
Lesson:
succession
(15)
Activity:
courtyard
scavenger
hunt (15)
Summary
Share (5)
HW #5
#1.6 Aim:
How do
ecosyste
(primary
ms
change
over
time?
Which kind of succession was that?
Agenda
QOD (10)
or secondary?)
What were the
Primary – starting from
Lesson:
a barren ocean floor…
succession
pioneer
species? What
was the climax
community?
(15)
Activity:
courtyard
scavenger
hunt (15)
Pioneer species - decomposers
Summary
Share (5)
HW #5
Climax community: the bacteria
decomposing the oils in the whale
bones that support all the other
species…