KEY%20CONCEPT%20Ecological%20succession%20is%20a%20process%20of%20change%20in%20the%20species%20that%20make%20up%20a%20community.

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KEY CONCEPT Ecological succession is a process
of change in the species that make up a
community.
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• Succession 1) to create a community in a
  previously uninhabited area (nothing was living
  there before) OR
• is the sequence of biotic changes that
  regenerate (repair) a damaged community

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• There are two types of succession.

1) primary succession the development of an
ecosystem in a previously uninhabited area
(nothing lived there before-IT WAS ONLY ROCK!!!!)
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• Pioneer species- the first organisms that live in
  a new area Ex lichen and some mosses break down
  rock into soil over time

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1- Bare rock is exposed and lichen and moss
break it down to dirt 0-15 yrs 2-Seeds are blown
into the area and small shrubs grow 15-80
yrs 3-As soil grows thicker, small trees take
root 80-115 yrs 4-Different tree species take
root, and replace the old trees 115-200 yrs
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2
1
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2) secondary succession started after a
disaster by the remaining species (soil was left
intact)
There is already soil!
70-100
0-2 yrs
2-18
18-70
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• Why do you think secondary succession takes less
  time than primary succession?
• Secondary succession starts with soil instead of
  bare rock.