Transcript Chapter 2 - Perry Local Schools

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 Science
Lesson 4
Changes 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
Climax Community
Lichens secrete acids that
break down rocks
Rocks also
break
down
through
weathering
Formed from seeds carried in
by the wind or animals
PRIMARY SUCCESSION
A climax community is the final step
in primary succession
Definition: A community
that 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 fastgrowing grasses and
non-woody plants and
then moves step-bystep 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
Examples
Ding 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