apes ch. 5, part 3
TRANSCRIPT
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Ecological Succession
Ch. 5 part 3
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Big Idea #4
Succession is the process of change in the structure of the environment and the composition of species in an ecosystem as the environment changes
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Where do forests come from?
They come about gradually through a process called ecological succession
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2 types
Type 1: primary successionBrand new land
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Primary succession
No soilFirst species to
come are called pioneers Mosses and lichen
Can grow on bare rock
As they grow they break apart the rock and form soil
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Primary succession
After a loooong time, there will be enough soil to support small plants like weeds, grasses, and small shrubs Mosses and lichens die off
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Primary successionFinally enough soil accumulates to
support treesAnd you get a climax community
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2 typesType 2: secondary successionOld land that has been wiped out
somehow
Examples: Abandoned farmlandBurned forestsPolluted streamsFlooded land
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Secondary Succession
The same thing happens, but much more quickly since there is already a soil base
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SuccessionAnimal species change through the
course of succession as well
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