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Biotic Factors Affect Populations
LT: I will be able to identify biotic
factors’ affects on populations
Pgs. 43-44
11/01/2012
Know
What biotic factors affect an ecosystem?
“I don’t know anything.” is not an acceptable answer.
Use complete sentences.
Evidence
Choose an animal and create a web to show how the biotic factors will
affect that animal and its habitat.
Clarifying ?s
biotic factors
6 types of biotic
factors
Biotic Factors That Affect Populations
Information
- the living parts of an ecosystem
Example: plants, animals, bacteria, fungi
1. Predation - one animal hunts and kills another for food
Examples: lions, tigers, bears, humans
Effect on population - Good hunters lower the population.
Poor hunters allow the population to increase.
2. Competition - the struggle between organisms to survive in
a habitat with limited resources
Example: Taller trees casting shade
on shorter trees in a dense forest
3. Humans
A. Habitat destruction - major cause of extinction - forests cut
down to build human homes
B. Poaching - illegal killing or removing of animals from an area
Examples: tropical fish, ivory, exotic birds, rhino horns
C. Pollution - Settles into water, air, and soil. Is absorbed by plants
and animals. Can affect food chain and cause birth defects.
Example: Birds with malformed beaks
4. Disease - Infectious diseases can spread from one organism to
another OR species to species!
Example: Flu, cold, smallpox, polio, HIV
5. Carrying capacity - too many organisms - not enough resources
6. Plants - type of plant determines what can live in area.
Summary:
Example: Lion on the Savannah
Clarifying ?s
biotic factors
6 types of biotic
factors
Biotic Factors That Affect Populations
Information
- the living parts of an ecosystem
Example: plants, animals, bacteria, fungi
1. Predation - one animal hunts and kills another for food
Examples: lions, tigers, bears, humans
Effect on population - Good hunters lower the population.
Poor hunters allow the population to increase.
2. Competition - the struggle between organisms to survive in
a habitat with limited resources
Example: Taller trees casting shade
on shorter trees in a dense forest
3. Humans
A. Habitat destruction - major cause of extinction - forests cut
down to build human homes
B. Poaching - illegal killing or removing of animals from an area
Examples: tropical fish, ivory, exotic birds, rhino horns
C. Pollution - Settles into water, air, and soil. Is absorbed by plants
and animals. Can affect food chain and cause birth defects.
Example: Birds with malformed beaks
4. Disease - Infectious diseases can spread from one organism to
another OR species to species!
Example: Flu, cold, smallpox, polio, HIV
5. Carrying capacity - too many organisms - not enough resources
6. Plants - type of plant determines what can live in area.
Summary:
Example: Lion on the Savannah
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