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Aim: How do abiotic (physical) limiting factors affect growth and survival in an ecosystem ?

Aim: How do abiotic (physical) limiting factors affect growth and survival in an ecosystem ?. HW due Thurs Read chapter 5 pg. 118-127 Do Making Connections pg.127. Ecosystems and Growth.

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Aim: How do abiotic (physical) limiting factors affect growth and survival in an ecosystem ?

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  1. Aim: How do abiotic (physical) limiting factors affect growth and survival in an ecosystem ? HW due Thurs Read chapter 5 pg. 118-127 Do Making Connections pg.127

  2. Ecosystems and Growth One of the features of an ecosystem is that its growth is limited under normal conditions by competition for resources within the system and by external factors such as environmental changes

  3. If the presence or absence of a factor limits the growth of the ecosystems elements, it is called a limiting factor . • There are several abiotic factors that limit ecosystem growth, including temperature, precipitation, sunlight, soil configuration, and soil nutrients.

  4. Observation of ecosystems in very different geographical regions

  5. Identify the maximum and minimum values and describe the overall shape of the graph

  6. Your task… • What limits the North American Tundra ecosystem? Explain your reason and point out evidence from the graphs that support your answer. • What limits the South African Grassland ecosystem? Explain your reason and point out evidence from the graphs that support your answer. • Work in groups – 5 minutes

  7. North American Tundra

  8. South African Wooded Grassland

  9. Interest Grabber What are limiting factors to population growth ? Section 5-2 • A situation that causes the growth of a population to decrease is called a limiting factor. Some limiting factors depend on the size of the population. Other limiting factors affect all populations in similar ways, regardless of the population size. Go to Section:

  10. Different factors can limit population growthHow is the population size affected by these factors?

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

  12. Unlimited resources Absence of predation No disease A Density-Dependent Limiting Factor Exponential Growth Section 5-2 Growth of Aphids Go to Section:

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

  14. Figure 5-7 Wolf and Moose Populations on Isle Royale How would you explain what is happening to the moose and wolf population ? 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:

  15. Human Population Growth Human population growthIs there a Carrying Capacity for Homo sapiens? Section 5-3 Industrial Revolution begins Agriculture begins Bubonic plague Plowing and irrigation

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