Biotic Factors That Affect Populations

Gaiser Life Science

KnowWhat biotic factors affect an ecosystem?

Evidence

Page #

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

Use complete sentences.

After listening to the PowerPoint lecture, come back here and list evidence to explain why your answer to the above question is or is not a good answer. You may also use other outside sources to help you respond.

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

Clarifying ?s Information

Page #

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.

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

Page #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

This PowerPoint was created by Tim Paterek from Charlene Shea’s lecture This PowerPoint was created by Tim Paterek from Charlene Shea’s lecture notes. All pictures came from Google Image Search. To fall within the Fair notes. All pictures came from Google Image Search. To fall within the Fair Use Guidelines, this PowerPoint must be used within the confines of the Use Guidelines, this PowerPoint must be used within the confines of the classroom and may not be published back onto the Internet unless the classroom and may not be published back onto the Internet unless the

pictures are removed.pictures are removed.