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Populations have three main characteristics: geographic distribution, density, and growth rate. A population's size is affected by the number of births, deaths, and individuals entering or leaving through immigration and emigration. Exponential growth occurs when a population reproduces at a constant rate with unlimited resources, while logistic growth follows exponential growth as resources become limited, slowing the population's growth until it reaches carrying capacity.
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5-1.ppt
- 2. KWL What are three things you want to know about population growth? What do you know about population growth?
- 3. How Populations Grow Characteristics of Populations –Three important characteristics of a population geographic distribution Density growth rate
- 4. Geographic Distribution Geographic Distribution Geographic distribution, or range, is a term that describes the area inhabited by a population.
- 5. Population Density Population density is the number of individuals per unit area. The population of saguaro cactus in the desert plant community has a low density, whereas other plants in that community have a relatively high density.
- 6. Populations Growth Population Growth Three factors can affect population size: number of births the number of deaths the number of individuals that enter or leave the population. * Simply put, a population will increase or decrease in size depending on how many individuals are added to it or removed from it
- 7. Immigration & Emmigration Immigration the movement of individuals into an area, is another factor that can cause a population to grow. Emigration the movement of individuals out of an area, can cause a population to decrease in size.
- 8. Word Origin Immigration is formed from the Latin prefix in-, meaning “in,” and migrare, meaning “to move from one place to another. If the Latin prefix e- means “out,” then which of the following means “migration out”? A.) emigration B.) migration C.) Immigration
- 9. Exponetial Growth Exponential Growth If a population has abundant space and food, and is protected from predators and disease, then organisms in that population will multiply and the population size will increase.
- 11. Exponential Growth Exponential growth occurs when the individuals in a population reproduce at a constant rate. Under ideal conditions with unlimited resources, a population will grow exponentially.
- 12. Checkpoint Which of the following is NOT a condition for a population to reach exponential growth? A.) presence of unlimited resources B.) Absence of predation and disease C.) movement of individuals out of the population
- 13. Logistic Growth Logistic growth occurs when a population's growth slows or stops following a period of exponential growth. As resources become less available, the growth of a population slows or stops. The general, S-shaped curve of this growth pattern, called logistic growth
- 15. Carrying Capacity Carrying Capacity The number or the largest number of individuals that a given environment can support.
- 16. List three characteristics that are used to describe a population. What factors can change a population's size? What is the difference between exponential growth and logistic growth?
- 17. Using Graphic Organizers Draw a concept map that shows how populations grow. Include the following terms: exponential growth, logistic growth, birthrate, death rate, immigration, emigration. Add any other terms that you think are useful to complete the map