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Warm-up

Warm-up. What is one fact about your biome you remember from the research on your biome?. What if humans suddenly went extinct?. https://www.youtube.com/watch?v=7ZPKw9fKhD0. Succession intro activity. What would happen if the SAHS football field was abandoned?

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Warm-up

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  1. Warm-up What is one fact about your biome you remember from the research on your biome?

  2. What if humans suddenly went extinct? https://www.youtube.com/watch?v=7ZPKw9fKhD0

  3. Succession intro activity What would happen if the SAHS football field was abandoned? Draw pictures (using color) to show what the field might look like in the future…10 years…25…50…100 years down the road.

  4. Ch. 3 Communities & Biomes

  5. Succession • Series of predictable changes that occurs in a community over time

  6. Primary Succession • The 1st stage • On land where there are no living organisms. • Pioneer Species: 1st species to populate the area

  7. Secondary Succession • When a disturbance changes the existing community, things must grow again • Ex. Land is cleared for farming, then abandoned, trees begin to grow again

  8. Biomes • Complex of terrestrial community that covers a large area • Has a certain soil & climate • Has particular plant & animals

  9. Warm-Up An uncut lawn becomes a meadow and eventually a forest. This process is an example of ___________. • Primary Succession • Secondary Succession • Limiting Factor • Tundra

  10. Biome Presentations • Respect every group. • I will deduct points from your entire group if you talk or interrupt other presentations. • Write one fact from each presentation to turn in. • Relax (not all of you) and have fun while you are PRESENTING but take notes while you watch.

  11. Ch. 4: Populations

  12. Characteristics of Populations • Geographic Distribution • Density • Growth rate

  13. Factors that Affect Population Growth • # of Births • # of Deaths • # of individuals that enter or leave the population.

  14. Exponential Growth • Individuals reproduce at a constant rate • Unlimited growth • J shaped curve

  15. Carrying capacity Number of Yeast Cells Time (hours) Logistic Growth • As resources become less available, the growth of a population slows or stops • Carrying capacity: The largest number of individuals that an environment can support. • S shaped curve

  16. Population Growth can be Logistic growth Exponential growth S-shaped curve Limits on growth J-shaped curve No limits on growth Unlimited resources Constant growth rate which cause a Falling growth rate Concept Map Section 5-1 characterized by represented by characterized by represented by

  17. Limiting Factors • A factor that causes population growth to decrease. • Nutrients, competition, predation, parasitism, water, humans

  18. Density Dependent Factors • Depend on population size • Competition, predation, parasitism, disease

  19. 60 2400 50 2000 40 1600 1200 30 20 800 10 400 0 1955 1960 1965 1970 1975 1980 1985 1990 1995 Moose Wolves How do increases and decreases in the moose population affect the wolf population?

  20. Density Independent Factors • Affect all populations in similar ways (do not depend on size) • Weather, Seasons, Natural Disasters, Human Activities

  21. Human Population Growth • Until about 500 years ago, the world’s human population remained fairly stable. Then, as advances in medicine, agriculture, and technology occurred, the human population began growing very rapidly. Today, the world’s human population is greater than 6 billion people, and it continues to grow, but at a slower rate.

  22. Human Population Growth Industrial Revolution begins Agriculture begins Bubonic plague Plowing and irrigation

  23. U.S. Population Rwandan Population Males Females Males Females Age Distribution

  24. The human population is increasing by about 1.4% each year. If the population is 6 billion (6,000,000,000) this year. How large will the population be next year? • 6,000,000,000 X 0.014 = 84,000,000 people, so the population would be 6,084,000,000 people. • If the human population continues to grow at a rate of 1.4 percent per year, the population would double in size (to 12 billion people) in only 51 years!

  25. What effect might this increase in population have on the environment and on other people?

  26. What will happen when humans reach their carrying capacity on Earth? • What do you think the carrying capacity of humans on the Earth is?

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