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Last time we talked about how the number of individuals in a population changes over time. Who remembers what this is called?

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Presentation on theme: "Last time we talked about how the number of individuals in a population changes over time. Who remembers what this is called?"— Presentation transcript:

1 Last time we talked about how the number of individuals in a population changes over time. Who remembers what this is called?

2 Sometimes a population of organisms will grow too much When there are too many organisms in a population, this is called overpopulation

3 Overpopulation is bad because too many organisms in an ecosystem will use up all of the ecosystem's resources Resources include food, water, and places to live

4 Every ecosystem has something called a carrying capacity The carrying capacity is the number of organisms an ecosystem can keep alive with its resources For example, ecosystems with lots of resources have a high carrying capacity

5 1) There are two ecosystems with different carrying capacities. Ecosystem 1 has lots of resources Ecosystem 2 has few resources Which ecosystem has a larger carrying capacity?

6 When an ecosystem has more organisms that its carrying capacity, overpopulation has occurred. Once overpopulation has occurred, serious changes start to happen in an ecosystem

7 Let's practice... 1) What is it called when there are too many organisms in an ecosystem? 2) What happens to the resources in an ecosystem when overpopulation occurs?


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