Download - Investigation 6 1
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Describe the limiting factors
of an ecosystem•What is an ecosystem?
•What are biotic & abiotic factors?
•What is reproductive
potential?•What is a limiting
factor?
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What is a What is a population?population?
• Every population has potential to Every population has potential to increase in sizeincrease in size– Some have potential for slow, steady Some have potential for slow, steady
growthgrowth– Others have potential to increase Others have potential to increase
rapidlyrapidly
• If you have the proper If you have the proper information, you can calculate the information, you can calculate the potential for population growth of potential for population growth of any organismany organism
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Reproductive
Potential
Theoretical unlimited
growth of a population over
time
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What information would you need in order to
predict the size of the population in the future?
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Entomologists have discovered. . .
•Live for 4 months•Female mates at 2 months•Female lays 100 eggs in her
lifetime•Eggs are a ratio of 50
male:50 female
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How many?Without any limitations on population growth, every
egg produces a new individual in the population, and every individual lives out its natural life every 4
months
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11
5050 102
2 months
25050
25002500 5100
4 months
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32 billion bugsCircle the Earth eight
times if they stood in a line, nose to tail
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32 billion bugs
Have a mass equal to about Have a mass equal to about 30,000 typical middle school 30,000 typical middle school
studentsstudents
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Why aren’t we overrun with milkweed bugs?
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Limiting FactorsAny biotic or abiotic
factors that acts in some way to limit the number
of individuals that survive and reproduce in
a population
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Population Limiting Factors
Biotic AbioticDisease Freezing
Predation DroughtStarvation Heat
Competition FloodOld age Storm
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ReflectionReflectionChoose your favorite biotic organism and
illustrate and explain at least 3 limiting
factors to its growth