p and s successions
DESCRIPTION
Primary and secondary successionsTRANSCRIPT
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Changes in Ecosystems:.
Ecological Succession
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• Do all ecosystems stay the same all the time?
• What are some things that cause changes to ecosystems?–Natural and unnatural (Quickly and
slowly)
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Ecological succession
• DEFINITION:
• Series of predictable changes that occur in a community over time. Caused by:– Physical environment– Natural disturbance– Human disturbance
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Primary Succession
• Begins in a place without any soil – Sides of volcanoes
– Landslides
– Glacier melting
• Starts with the arrival of living things such as lichens that do not need soil to survive, called PIONEER SPECIES.
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Pioneer species
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http://www.life.uiuc.edu
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http://uisstc.georgetown.edu
http://www.uncw.edu
Primary Succession
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Reaching a mature community can
take CENTURIES.
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Secondary Succession
• It´s the series of changes that occur in an area where the ecosystem has been disturbed, but where soil and organisms still exist.
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• Succession following a disturbance that destroys a community without destroying the soil
• Natural Human disturbance– Hurricane - Farming– Fires - Forest clearing
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Secondary succession
• Unlike primary succession, secondary succession occurs in a place where and ecosystem currently exists.
• And occurs more rapidly than primary succession.
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http://www.geo.arizona.edu
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http://www.ux1.eiu.edu
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References:
• http://www.slideshare.net/radhakrishnan1962/ecological-succession-1
• Science explorer Prentice Hall. Environmental Science
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CLASSWORK
• PAGE 35