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Investigation 6: Population Size

Investigation 6: Population Size. Part 1: Reproductive Potential. Recall that a population is all the individuals of a species that are living in an area at one time. Part 1: Reproductive Potential. Every population has the potential to increase in size.

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Investigation 6: Population Size

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  1. Investigation 6: Population Size

  2. Part 1: Reproductive Potential • Recall that a population is all the individuals of a species that are living in an area at one time.

  3. Part 1: Reproductive Potential • Every population has the potential to increase in size. • Some populations have the potential for slow, steady growth; others have the potential to increase rapidly. • If you have the proper information at hand, you can calculate the potential for population growth for any organism. • The theoretical unlimited growth of a population over time is its reproductive potential.

  4. Part 1: Reproductive Potential What information would you need in order to predict the size of the population in the future?

  5. Part 1: Reproductive Potential Milkweed Bug

  6. Part 1: Reproductive Potential • Look at Milkweed-Bug Reproductive Potential Data Sheet • Entomologist have discovered some general information about the lives of milkweed bugs living in the wild. • That information is written on your sheet in the question and answer chart. • Based on the information at hand, you should be able to figure out how many bugs will be in the population after a month, 2 months, or a year, if nothing limits population growth.

  7. Part 1: Reproductive Potential • Complete worksheet. – Keep the following thoughts in mind: • You start with one male and one female. • Only the females reproduce. • Half of the offspring are females and half are males. • The offspring from the previous generation are the parents in the next generation. • Milkweed bugs live 4 months. • Population reduction is the number of parents in the previous generation.

  8. Part 1: Reproductive Potential • Without any limitation on population growth, every egg produces a new individual in the population, and every individual lives out its natural life, 4 months. • A pair of milkweed bugs has the potential to produce a population of almost 32 billion bugs in one year.

  9. Part 1: Reproductive Potential • This number of milkweed bugs would circle Earth eight times if they stood in a line, nose to tail. • They would cover eight football fields if they all crowded together, but didn’t crawl on top of one another. • Have a mass equal to about 30,000 typical middle school students. • Fill about 12 typical middle school classrooms floor to ceiling.

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