Populations and ecosystems
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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?

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Populations and Ecosystems

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Populations and ecosystems

Populations and Ecosystems


Population

Population

  • 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


Prediction

Prediction:

  • 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.


Reminders

Reminders:

  • 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.


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