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Population Ecology

Population Ecology. Mr. Beaty 2006-2007. Bellringer. Why do you think that it is important to study populations? What properties of populations do you think ecologists study?. Chemistry Retake. The chemistry retake test will be given in the lab on Monday at 3:05.

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Population Ecology

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  1. Population Ecology Mr. Beaty 2006-2007

  2. Bellringer Why do you think that it is important to study populations? What properties of populations do you think ecologists study?

  3. Chemistry Retake • The chemistry retake test will be given in the lab on Monday at 3:05. • Ticket to Get In: You must complete a short research paper on an enzymes. Make sure that you include what the enzyme is used for, how it work, its chemical structure, etc. (Typed, 12pt font, ds)

  4. EQ: How will our population grow? • Population - a group of organisms that belong to the same species and live in a particular area.

  5. Properties of Populations • Size • Density • Dispersion The spatial distribution of individuals within the population

  6. Population Dynamics • Birth rate • Mortality rate • Life Expectancy • Age structure – The distribution of individuals among different ages in a population. • Populations with a high percentage of young individuals have a greater potential for rapid growth.

  7. Age Structure Graphs

  8. Survivorship Curves • Show the likelihood of surviving at different ages.

  9. How will our population grow? • Explain Lab

  10. 3 Types of Survivorship Curves:

  11. Population Dynamics • Growth Rate – (birth rate – death rate = growth rate) • Emigration • Immigration

  12. Bellringer • Explain the following terms: denitrification, nitrification, ammonification, nitrogen fixation • Give examples for type I,II and III survivorship curves. • List the levels or organization beginning with the organism. • How are humans negatively impacting the following biomes: Tropical Rain Forest, Grasslands,

  13. Bellringer • Explain the following terms: denitrification, nitrification, ammonification, nitrogen fixation • Give examples for type I,II and III survivorship curves. • List the levels or organization beginning with the organism. • How are humans negatively impacting the following biomes: Tropical Rain Forest, Grasslands, Deciduous Forest, Tiaga

  14. Exponential and Logistic Models • Exponential model – J shaped curve (the population is continuously growing) • What do you think would eventually happen if this type of growth continues? • The human population is growing exponentially. • Human population – hunter/gatherers, agriculture, industrial revolution

  15. Exponential Growth

  16. Logistics Model • The curve will flatten out after carrying capacity is reached • Carrying capacity – the # of individuals the environment can support over a long period of time. • Logistics growth – birth rate = death rate

  17. Logistics Growth

  18. Population Regulation • Density Independent factors – weather, floods, fires reduce the population by the same proportion regardless of population size • Density Dependent factors – include resource limitations such as shortages of food or nesting sites, and are triggered by increasing population density.

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