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Populations

Populations. Population or not?. The monkeys in a rainforest. E. coli bacteria growing in a petri dish. Humans on Earth. The cats in my neighborhood. The trees in a forest. BioEd Online. Population. A group of organisms of the same species that live within a given area.

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Populations

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  1. Populations

  2. Population or not? The monkeys in a rainforest

  3. E. coli bacteria growing in a petri dish

  4. Humans on Earth

  5. The cats in my neighborhood.

  6. The trees in a forest

  7. BioEd Online Population • A group of organisms of the same species that live within a given area Ostriches are nomadic, wandering in small groups. Aspen trees are quick to pioneer areas that have been disturbed by fire.

  8. a) Dispersion • Give an example of each type

  9. Gannets nesting

  10. Solitary tree sloth

  11. School of fish

  12. Population density (total population size per unit of area)

  13. c) Growth Rate (Births + Immigrants) - (Deaths + Emigrants) Population Size

  14. One bacterium divides in two in 20 minutes. This process continues for several days. • Sketch the population growth graph.

  15. Exponential growth curve (J shape)

  16. Exponential growth is a rapid population increase due to an abundance of resources.

  17. Logistic growth curve (S shape) isdue to a population facing limited resources. Carrying capacity is the maximum number of individuals in a population that the environment can support

  18. Ecological factors limit population growth • Density-dependent limiting factors are affected by the number of individuals in a given area.

  19. Competition for food, shelter Predation Parasitism and disease Density-dependent limiting factors are affected by the number of individuals in a given area.

  20. Unusual weather Natural disasters Human activities Density-independent limiting factors limit a population’s growth regardless of the density

  21. Density - dependent or density – independent factor? • Tornado • independent • Food supply • dependent • Amount of rainfall • independent • Temperature • independent • Available drinking water • dependent • Spreading of a disease • dependent

  22. Reproductive Strategies

  23. Survivorship curves

  24. Choose type I, II, or III for • Humans • Fish • Lizards • Birds • Insects • Lions • Squirrels • Plants

  25. Population Pyramids

  26. Who are the circled people? What is significant about them?

  27. Most Populated Cities (1/6/2007) http://www.citymayors.com/statistics/largest-cities-population-125.html

  28. Growth curve for the human population

  29. http://www-popexpo.ined.fr/eMain.html hhttp://www-popexpo.ined.fr/eMain.htmlttp:/www-popexpo.ined.fr/eMain.html

  30. Doubling Time • The amount of time needed for a population to double • Doubling time (in years) = 70 annual percent growth rate • The world’s annual growth rate is about 1.75%. What is the current doubling time? • 40 years

  31. What is an ecological footprint? • The demands a person places on the environment in terms of land, water, food, waste, fibers, etc. • Go to www.myfootprint.org and take the quiz. Bring in your results.

  32. "It's up to us to make a global effort to limit population growth - or we can wait until the environment does it for us."

  33. http://www-popexpo.ined.fr/eMain.html Sources cited • http://www.biology.iupui.edu/biocourses/N100H/ch39pop.html • http://ublib.buffalo.edu/libraries/projects/cases/squirrel_monkey/monkey.gif • http://office.microsoft.com/clipart/basket.aspx • http://www.frame37gallery.com/gfo • http://www-popexpo.ined.fr/eMain.htmlrest22.htm • http://www.prb.org/Content/NavigationMenu/PRB/AboutPRB/Population_Today1/may99_pt.pdf

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