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Journal #______

Journal #______. What is acid Rain? Name at least 3 ways it is harmful to the environment. Day 5. Population Biology. Compare Exponential & Linear Population Growth. Exponential: Occurs when number of organisms increases rapidly Produces J-shaped curve on graph. 2. Linear:

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Journal #______

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  1. Journal #______ • What is acid Rain? • Name at least 3 ways it is harmful to the environment

  2. Day 5

  3. Population Biology Compare Exponential & Linear Population Growth • Exponential: • Occurs when number of organisms increases rapidly • Produces J-shaped curve on graph

  4. 2. Linear: • Shows slow steady growth • Birth & death rates are equal • Produces straight line on graph

  5. Describe carrying capacity • The number of organisms that an environment can support • Limits the population • Affected by: temperature, food supply, reproduction, hunting

  6. Figure 5-4 Logistic Growth of Yeast Population Section 5-1 Carrying capacity Number of Yeast Cells Time (hours) Go to Section:

  7. What are some factors that affect population size? • Predation: • Predators limit number of prey • Pick out the sick, old, young • 2. Competition: • Compete for resources • Water, food, living space, mates

  8. Figure 5-7 Wolf and Moose Populations on Isle Royale Section 5-2 60 2400 50 2000 40 1600 1200 30 20 800 10 400 0 0 1955 1960 1965 1970 1975 1980 1985 1990 1995 Moose Wolves Go to Section:

  9. 3. Environmental changes: • pollution, thermal warming, unfit water, disease, all effect the population number

  10. 4. May cause species to become threatened or endangered • Threatened - when population declines rapidly • Endangered - when numbers are so low that extinction is possible in near future • c. Extinction - disappearance of species

  11. Quiz #4

  12. 1. The number of species that a community can support is called? a. carrying capacity b. limiting factor c. succession 2. _______ growth shows a slow steady growth. A. exponential b. carry c. linear d. predation 3. When a population declines rapidly, this is called _______. A. endangered b. extinct c. unfit d. threatened 4. Name 1 change that could effect populations. Number 5 is on the next slide

  13. 5. What is happening at the top of the graph? A. more deaths than births b. births=deaths c. more births than deaths

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