116 Ecological Succession 115 12/9/2014 Starter: Ecological Succession in a Garden ON Next Slide...
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Transcript of 116 Ecological Succession 115 12/9/2014 Starter: Ecological Succession in a Garden ON Next Slide...
116Ecological Succession
115
12/9/2014
Starter:Ecological Succession in a Garden
ON Next Slide
Connection:
Succession Concept Map
Ecological Succession
12/9/2014
Application/Connection/Exit: Notes: Glue here when done
Practice:
What are some factors that affect the environment?
Notes: Glue here when done
Exit:
Explain why secondary succession is important to an ecosystem?
A science class was awarded a grant to start a garden at their middle school. The students chose an open area that was covered with grass. The first step in preparing to plant their garden was to remove the grass and till the soil. Once the area was cleared the students ordered their vegetable seeds. It took two weeks for the seeds to be delivered. After two weeks the students went out to their cleared area to plant their vegetable seeds. What do you think the students found when they visited their area after two weeks? Circle the answer that best matches your thinking. Nothing has changed. The area looks the same as it did after removing the grass. The grass has grown back so it must be removed again. Weeds have taken over the area and are thriving.
Which statement do you agree with?
STARTER
December 9, 2014
AGENDA1 Starter 2.Notes3.Map Objective
TEKS 7.10C observe, record, and describe the role of ecological succession such as in a microhabitat of a
garden with weeds by completing notes and
concept map.
Date Lecture/ Activity/ Lab Page
12/1 Biomes Video 103-10412/2 Biodiversity Lab 105-10612/3 Biodiversity Reading 107-10812/4 Biome Biodiversity Poster 109-11012/5 Biodiversity Writing 111-11212/8 Island Rat 113-11412/9 Ecological Succession 115-116
Ecological Succession Notes
The environment is constantly changing as a
result of weather or the activities
of humans & other organisms.
These changes can naturally happen
slowly over time or quickly as a result of natural disasters or
catastrophic events.
A community of organisms that
occupy an area is also constantly changing and
result in long-term changes in an ecosystem.
All of these changes that occur in an
ecosystem over time result in ecological
succession.
Primary succession
occurs in an area where no
ecosystem existed.
Examples: after a volcanic eruption or bare rock under a
glacier.
The first species to populate an area during primary
succession, called pioneer species…
…are usually mosses or lichens which are able to
grow on bare rock… release acids that begin to break down rock to
create soil.
As colonies of grasses & ferns are established, small animals will move into the area that
feed on the plants.
Larger animals can then move in &
feed on the smaller animals.
More soil is formed that can support larger plants like shrubs which can provide new habitats for more animals.
More soil continues to form & become richer &
deeper so that trees can now be supported
& the community continues to grow.
Given enough time and the right conditions, primary succession may lead to a community in equilibrium that will not change drastically unless the ecosystem is disturbed.
This type of community is known as a climax or mature community.
Secondary succession occurs after a
disturbance in an existing ecosystem
where soil is already established so weeds and grasses can start to grow immediately.
Examples: after forest fires, tornadoes,
hurricanes, floods, etc…
Secondary succession occurs more rapidly
than primary succession to restore the
ecosystem to a state of equilibrium that can be maintained over time.
Stages of primary succession: (forest)
bare rock=> mosses / lichens => grasses &
ferns=> bushes & shrubs=> trees
(young forest) => mature forest (climax
community)
Stages of primary succession
bare rock
grasses & ferns
bushes &
shrubs
trees- young forest
mature forest=>
climax community
mosses &
lichens
Time
Stages of secondary succession: (forest)weeds=> grasses & ferns=> bushes &
shrubs=> trees (young forest) =>
mature forest (climax community)
Stages of secondary succession
weedsgrasses & ferns
bushes &
shrubs
trees- young forest
mature forest=>
climax community
Time
116Ecological Succession
115
12/9/2014
Starter:Ecological Succession in a Garden
ON Next Slide
Connection:
Succession Concept Map
Ecological Succession
12/9/2014
Application/Connection/Exit: Notes: Glue here when done
Practice:
What are some factors that affect the environment?
Notes: Glue here when done
Exit:
Explain why secondary succession is important to an ecosystem?