Transcript Succession in Ecosystems

Succession in
Ecosystems
Mrs. Karim
Successiona gradual changes in a
community over a period of time.
new populations of organisms
gradually replace existing ones
There are three different
stages to succession:
1. Primary succession
2. Secondary succession
3. Climax Community
Primary successionLife start forming in rocks, no
Soil.
Examples:
– Lichens grow bare rock
Primary successionNew bare rock comes from 2
sources:
1. volcanic lava flow cools
and forms rock
Primary successionAnd the other source of rocks
2. Glaciers retreat and expose
rock
Pioneer Speciesthe first organisms to colonize
or grow in anew site
Ex: lichens are the first to
Colonize lava rocks
Secondary successionsequence of community changes
that takes place when a
community is disrupted by
natural disaster or human
actions – takes place on
existing soil
Secondary successionEx:
A fire levels
portions of a
forest
Soil will be
left behind to
start
secondary
succession
Secondary successionEx:
A farmer
plows his
field
Climax communitya stable, mature community that
undergoes little or no
succession
Climax communityEx: In most of Virginia, the climax
community would be a deciduous
oak–hickory forest
Vocabularies
Biotic : living things. Give example
Abiotic: non living things. Give examples
Producers: plants …. Why?
Consumers: human, animals,bacteria,… why?
Stages of succesion
Rock
Label the stages of
succession
Secondary succession-
Secondary succession-
Explain the stages of
ecological succession
Succession video
https://www.youtube.com/watch?v=E0qdW
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