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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.
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Biotic Factors Affect PopulationsLT: I will be able to identify biotic factors’ affects on populations Pgs. 43-4411/01/2012
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.
Biotic Factors That Affect Populations Information Clarifying ?s - the living parts of an ecosystem biotic factors Example: plants, animals, bacteria, fungi 6 types of biotic factors 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. Example: Lion on the Savannah Summary:
Biotic Factors That Affect Populations Information Clarifying ?s - the living parts of an ecosystem biotic factors Example: plants, animals, bacteria, fungi 6 types of biotic factors 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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