ecological succession a series of predictable changes that occur in a community over time. ...
TRANSCRIPT
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Ecological Succession
A series of predictable changes that occur in a community over time.
Ecosystems change over time especially after disturbances, as some species die out and new species move in.
Ecological model: a model scientists use to predict changes that will happen in an ecosystem that occurs over a long distance or over a long period of time.
number of different species present typically increases.
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How many changes over time can you find?
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Primary Succession Succession that begins in an area with no remnants of an older
community
No life present
only rock and eventually soil
Occurs at a very slow rate
Examples:
retreating glaciers
emerging islands
formation of new lake
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Secondary Succession
The existing community almost completely destroyed by disturbances.
Proceeds faster than primary succession, because soil is present.
As a result, new and surviving vegetation can regrow rapidly, reach climax community faster
Examples:
Fire
Floods
Bulldozers
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Climax Community Last stage of succession
Succession does not always follow the same stages for every community.
Healthy ecosystems will often reach the original climax community.
Example: succession caused by storms and forest fires
Some ecosystems, due to extensive human caused disturbances, may never fully recover
Examples: succession due to clearing and farming of tropical rainforests (deforestation)
Caused by pollution