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 resources6. 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 resources6. Plants - type of plant determines what can live in area.

Example: Lion on the Savannah

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

be published back onto the Internet unless the pictures are removed.be published back onto the Internet unless the pictures are removed.