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Learning Targets for October 8-9 th , 2013

Learning Targets for October 8-9 th , 2013. I can describe the key characteristics of populations. I can describe the different types of population growth. I can differentiate between Density dependent factors and Density Independent factors. I can explain a Life Survivorship Curve.

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Learning Targets for October 8-9 th , 2013

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  1. Learning Targets for October 8-9th, 2013 I can describe the key characteristics of populations. I can describe the different types of population growth. I can differentiate between Density dependent factors and Density Independent factors. I can explain a Life Survivorship Curve. Homework: Read “Winter Plants” in The Forest Unseen

  2. Thinking about Populations

  3. How Populations Grow • Characteristics of Populations: • Three important characteristics of a population are its geographic distribution, density and growth rate. • Population density is the number of individuals in an area. • Population Growth is the number of births, the number of deaths and the number of individuals entering or leaving the population. • Geographic Distribution is how the organisms are arranged (distributed) on earth (not just where they are found).

  4. PopulationDensity

  5. Population Growth: • Key Terms to know: • Logistic growth – when the population growth slows or stops • Carrying capacity – the limit of individuals that the environment can sustain. • Exponential growth – when the individuals are reproducing at a constant rate.

  6. Population Growth:

  7. Population Growth

  8. Human Population Growth

  9. Survivorship Curves • A Survivorship Curve is a plot of the proportion of numbers in a group alive at a given age.

  10. Patterns of Dispersion within a Population Clumped; many organisms are clumped do to resource supply. Uniformed; many organisms are uniformly dispersed due to territories. Random; many organisms are found in random due seed dispersal.

  11. Limits To Growth: • Density Dependent Factors: these limit the population when the density becomes too great. • Density dependent factors include competition, predation, parasitism and disease • Density Independent Factors: limit the population regardless of the population size. • Examples include damming rivers, natural disasters, clear cutting forests, seasonal cycles, etc.

  12. Population Comparison: • Turn to page 123 in your text book. • Answer the question do fruit flies and rabbits show similar trends in population growth?

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