Transcript Know
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 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 PowerPoint must be used within the confines of the classroom and may not be published back onto the Internet unless the pictures are removed.