Warm Up 4/4
Plant Quiz
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You may use your lab!!
Don’t forget – Plant Project is Due 4/10
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For the next activity, everyone needs a pair of scissors.
Ecosystem Interactions
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Cut out and glue the vocabulary words IN THIS ORDER into a column in
your spiral. Be sure to leave room for the definition and example to the
right of the word.
 Biotic
 Abiotic
 Population Density
 Population Growth
 Exponential Growth
 Logistic Growth
 Carrying Capacity
 Density-Independent Limiting Factor
 Density-Dependent Limiting Factor
 Ecological Succession
 Primary Succession
 Secondary Succession
Ecosystem Interactions

Cut out the definitions.
Match them up to the words, do the best you can.
Now cut out the examples.
Match them up to the words, do the best you can.
We will be going over this in class.

DON’T GLUE TILL YOU KNOW IT’S RIGHT!
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Ecosystem Interactions
& Populations
Biotic Factors


Biological influences that include
the entire living cast of
characters in which an organism
might interact
Examples: bacteria, plants,
bullfrogs, birds, Mrs.Vohl,
Chupacabra
Abiotic factors


Physical or nonliving
factors that shape
ecosystems
Examples: wind,
hurricanes, soil,
temperature, light, this
classroom
Population Density

The number of individuals per unit area
Population Growth

# of births, # of deaths & # of people leaving and/or
entering
Immigration
Population
Emigration
Exponential Growth

Reproduction at a constant rate; unlimited resources
Logistic Growth

Population growth slows or stops after exponential growth;
limited resources
Carrying Capacity

The largest number of
individuals that a given
environment can
support
Density-Independent Limiting Factors


Causes population to decrease regardless of
population size
Weather, natural disasters, human activities
Density-Dependent Limiting Factors

Causes population growth to decrease when density
is high
Types of Density-Dependent Factors
1.
2.
3.
Competition
Predation
Parasitism &
Disease
Ecological Succession
A series of predictable changes that occurs in a
community over time
 Can be caused by slow changes in the physical
environment or a sudden natural
disturbance from
human activity
(clearing a forest)

Primary Succession
Succession that occurs on surfaces where no soil exists
(volcanic eruptions)
 The pioneer species on volcanic rocks are often lichens
(combination of fungus
and algae)

Secondary Succession

A disturbance of some kind changes an existing
community without removing the soil
Password Review
Link
Succession Reading and Worksheet


You have a class set of a reading that talks about
succession happening in a pond.
Read the information and answer the questions.
Cool Down

What is the difference between primary and secondary
succession?
What is the difference between density-dependent and
density-independent limiting factors? Give an example of
each.

Clean up!
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Put your scissors and glue sticks away.
Throw away your trash.
Leave your table tidy!