Do Now Collect materials from the front of the room Turn in Symbiosis worksheet (if you didn’t do it yesterday) Take your seat Remember: QUIZ ON Friday.

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Presentation transcript:

Do Now Collect materials from the front of the room Turn in Symbiosis worksheet (if you didn’t do it yesterday) Take your seat Remember: QUIZ ON Friday Start working on Ecological Relationships Model 1

Objective analyze population growth graphs and explain how limiting factors affect carrying capacity. By the end of class, students will be able to:

Populations A population is all of the organisms of one species inhabiting a particular place

Population Size Populations can increase or decrease in size depending on different factors.

Population Size What can cause a population to grow in size?

Population Size What can cause a population to grow in size? BirthsImmigration

Population Size What can cause a population to decrease in size?

Population Size What can cause a population to decrease in size? Deaths Emigration

Population Growth Models Exponential vs. Logistic Growth

Exponential Growth J curve Unlimited resources

Logistic Growth S Curve Limiting factors

Which Occurs More in Nature?

Logistic Growth! Why?

Exponential Growth J curve

Why is the water overflowing in the picture below?

Capacity The maximum amount something can hold How does this relate to logistic growth of populations?

Carrying Capacity The population size an area can support Note: specific to the area and to the species!

What determines carrying capacity?

Limiting factors Density-dependent factors Density-independent factors

Density Dependent Predation Competition Infectious disease Prey availability

Density Independent Genetic diseases Weather

Populations can exceed their carrying capacity … for a while

Please finish Questions 1-9, 11-13

Speaking of overpopulated

Exit Ticket Silently without notes! Why do populations have a carrying capacity? (In other words why can’t populations continue to grow forever?)

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