18.3 - Types of Interactions

In a natural community, population sizes vary because...

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• the populations are not affected by each other.

• the populations all affect one another.

• individuals in the populations decide to have big families.

• the populations are able to grow without stopping.

Several frog each lay hundreds of eggs in a small pond.

What happens to the population of frogs in the pond immediately after?

What happens after a few months? Explain your answer.

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A resource so scarce that it limits the size of a population is called...

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• a limiting factor
• an abundant factor
• a nonessential factor
• a surplus factor

Why can't a population just keep growing forever?

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The largest population that an environment can support is called its...

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• population limit
• carrying capacity
• maximum capacity
• environmental threshold

What happens when a population grows larger than its carrying capacity?

Choose an animal and write a short description of what would happen.

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Ecologists have listed four main ways that species and individuals affect each other:

Competition, Predator and prey, ---------, and coevolution.

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When two or more individuals or populations try to use the same resource, it is called...

• Competition

• Symbiosis

• Survival of the fittest

• Coevolution

I have given you several examples of competition. Sort them into groups depending on if the competition is between individuals in a population OR between different populations.

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Groups:

(a) Competition between population members

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(b) Competition between different Population

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List two adaptations predators use to catch prey.

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