BIOLOGY - St. Francis Preparatory School
BIOLOGY Class Notes 10-2
Aim: How is population growth limited?
A) LIMITING FACTORS
o Limiting factors: factors that cause population growth to decrease
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← All of the above listed are examples of limiting factors which have a direct affect on population size
B) DENSITY DEPENDENT FACTORS
← Density dependent factors: limiting factors that depend on population size
← they only become limiting factors when the population density reaches a certain level
← density dependent factors usually do not affect smaller populations
← Examples are:
1. Competition
2. predation
3. parasitism and disease
C) DENSITY INDEPENDENT FACTORS
← Density independent factors: affect all populations regardless of population size
← Examples are:
1. unusual weather
2. natural disasters
3. seasonal cycles
4. human activities
Check out the Power Point below on Ecology.
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