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Bellwork: Wednesday, Oct 10th
• Grab your supply bins. Get the one that corresponds to the number on your table!
• Complete pg 41 #5 & pg 102 #6
• Pull out your carrying capacity worksheet from yesterday.
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Life ScienceLesson 4Changes in Ecosystems
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Succession
Definition:
The replacement of one type of community by
another at a single location over a period of
time
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PRIMARY SUCCESSION
Definition: A community that starts to grow in an area that has no soil such as •a cooled lava field•bare rock field caused by a retreating glacier
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Primary Succession, continued
The 1st organisms to live in the lifeless area are called pioneer species, such as lichens.
In a forest lichens are followed
by mosses, grasses, shrubs,
heath mat, pines, and ending
in hardwoods
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PRIMARY SUCCESSION
Lichens secrete acids that break down rocks
Rocks also break down through weathering
Formed from seeds carried inby the wind or animals
Climax Community
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PRIMARY SUCCESSION
A climax community is the final step in primary succession
Definition: A communitythat does not undergo further succession
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SECONDARY SUCCESSION
• Definition:
A type of succession that occurs in areas that are disturbed, but still have soil
• Example:
A fire or flood
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SECONDARY SUCCESSION
• Begins with fast-growing grasses and non-woody plants and then moves step-by-step toward a climax community just as
primary succession
does
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SECONDARY SUCCESSION
Climax Community
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Intentional Succession
Definition: A type of secondary succession that occurs in areas that are intentionally disturbed
This most often takes place through controlled
burns
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Controlled Burn
Controlled burning stimulates the
germination of some desirable forest trees,
thus renewing the forest. Some cones, such
as sequoia require heat from a fire to open
cones to disperse seeds.
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Examples
Highbanks Metro Park in Columbus
• Their controlled burn restored the prairie to maintain the bluebird population
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ExamplesDing Darling Wildlife Refuge on Florida’s
Sanibel, Island
• The purpose of their burn was to remove unwanted growth, reduce risk of a wildfire, and to promote native natural habitat