bellwork: wednesday, oct 10th grab your supply bins. get the one that corresponds to the number on...
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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.
Life ScienceLesson 4Changes in Ecosystems
Succession
Definition:
The replacement of one type of community by
another at a single location over a period of
time
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
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
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
PRIMARY SUCCESSION
A climax community is the final step in primary succession
Definition: A communitythat does not undergo further succession
SECONDARY SUCCESSION
• Definition:
A type of succession that occurs in areas that are disturbed, but still have soil
• Example:
A fire or flood
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
SECONDARY SUCCESSION
Climax Community
Intentional Succession
Definition: A type of secondary succession that occurs in areas that are intentionally disturbed
This most often takes place through controlled
burns
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.
Examples
Highbanks Metro Park in Columbus
• Their controlled burn restored the prairie to maintain the bluebird population
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
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