Objective: What are the factors that affect population size?

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Presentation transcript:

Objective: What are the factors that affect population size?

 Take the page and divide it into 6 equal boxes  Number the boxes Notes: Populations

 Geographic distribution: the area the population lives in  Population Density: number of individuals per unit area  Growth rate: how quickly a population increases or decreases

 # of births  #deaths  # of individuals that enter or leave the  Immigration: enter into an area  Emigration: leave an area

 J-shaped graph  Under ideal conditions: unlimited resources TIME POPULATION SIZE

 Quick growth in beginning  As resources become limited growth slows or stops  Carrying Capacity: max # of individuals an environment can support Carrying capacity Time Population Size

 Anything that’s causes population growth to decrease  Examples:  Competition  Disease  Natural Disaster

Talk it Over: 1) A food chain 2) Name 3 abiotic factors in this ecosystem 3) Identify 3 different limiting factors

Copy down and fill in with:, or = Population increase = birth rate _____ death rate Population decrease = birth rate _____ death rate Population stable = birth rate _____ death rate > < =

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