Biotic Factors Affect Populations LT: I will be able to identify biotic factors’ affects on populations Pgs. 43-44 11/01/2012.

Biotic Factors Affect Populations

LT: I will be able to identify biotic factors’ affects on populations

Pgs. 43-4411/01/2012

KnowWhat biotic factors affect an ecosystem?

Evidence

“I don’t know anything.” is not an acceptable answer.

Use complete sentences.

Choose an animal and create a web to show how the biotic factors will affect that animal and its habitat.

Clarifying ?s InformationBiotic Factors That Affect Populations

biotic factors - the living parts of an ecosystem

6 types of biotic factors

1. Predation - one animal hunts and kills another for foodExamples: lions, tigers, bears, humans

Example: plants, animals, bacteria, fungi

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

A. Habitat destruction - major cause of extinction - forests cut down to build human homesB. Poaching - illegal killing or removing of animals from an area

Examples: tropical fish, ivory, exotic birds, rhino hornsC. 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

Summary:

4. Disease - Infectious diseases can spread from one organism to another OR species to species!

Example: Flu, cold, smallpox, polio, HIV5. Carrying capacity - too many organisms - not enough resources

6. Plants - type of plant determines what can live in area.

Example: Lion on the Savannah

3. Humans

Clarifying ?s Information

Summary:

Biotic Factors That Affect Populations

biotic factors - the living parts of an ecosystem

6 types of biotic factors

1. Predation - one animal hunts and kills another for foodExamples: lions, tigers, bears, humans

Example: plants, animals, bacteria, fungi

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

A. Habitat destruction - major cause of extinction - forests cut down to build human homesB. Poaching - illegal killing or removing of animals from an area

Examples: tropical fish, ivory, exotic birds, rhino hornsC. Pollution - Settles into water, air, and soil. Is absorbed by plants and animals. Can affect food chain and cause birth defects.

3. Humans

Example: Birds with malformed beaks4. Disease - Infectious diseases can spread from one organism to another OR species to species!

Example: Flu, cold, smallpox, polio, HIV5. Carrying capacity - too many organisms - not enough resources

6. Plants - type of plant determines what can live in area.

Example: Lion on the Savannah

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