Populations and ecosystems
Sponsored Links
This presentation is the property of its rightful owner.
1 / 8

Populations and Ecosystems PowerPoint PPT Presentation

  • Uploaded on
  • Presentation posted in: General

Populations and Ecosystems. Population. All the individuals of a species that are living in an area at one time . Milkweed Bug Reflection. How big was your population of milkweed bugs ? Will the population continue to grow? How big will the population be in a month?

Download Presentation

Populations and Ecosystems

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

Populations and ecosystems

Populations and Ecosystems



  • All the individuals of a species that are living in an area at one time.

Milkweed bug reflection

Milkweed Bug Reflection

  • How big was your population of milkweed bugs?

  • Will the population continue to grow?

  • How big will the population be in a month?

  • How big will the population be in a year?

Reproductive potential

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.

Determining reproductive potential

Determining Reproductive Potential

  • What information would you need in order to predict the size of the population in the future?

Milkweed bug reproductive potential

Milkweed Bug Reproductive Potential

  • Entomologists 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.

  • Your observations from last year should have provided similar information for the indoor milkweed bugs.

  • Based on the information at had, 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



  • Predict how many milkweed bugs will be in the population if they start with just one adult male and one adult female bug, and the population reproduces without limitation for a year.



  • 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.

  • Only females produce eggs. Half the population is female.

  • Both male and female bugs are 2 months old when they reach maturity and mate, and the females produce 100 eggs

  • When a generation reaches maturity at 2 months, its parents are 4 months old and they die. Dead bugs must be subtracted from the population

  • The population at any time is the number of immature milkweed bugs plus their parents, minus their grandparents.

  • Login