1.5 Predation

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What is a predator?
An organism that feeds on another organism.
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How do predators evolve?
Faster movement, camouflage, better means of detecting prey.
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How do prey evolve?
Better camouflage, more protective features i.e spines, concealment behaviour.
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What is predation?
When one organism is consumed by another.
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Why are prey normally exterminated by predators in a lab environment?
There are fewer potential refuges. In the wild, some prey can escape so they rarely become extinct.
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Why is it sometimes necessary to observe predator-prey relationships in labs?
It is difficult to count all the individuals in a natural population.
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What does a graph of numbers of predators and prey over time look like?
Fluctuations with prey always higher than predators, and peaks in predators following peaks in prey.
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Why do population crashes create selection pressure?
Only the individuals able to escape predators, or catch prey, will survive to reproduce. Therefore the population becomes better adapted for these things.
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How does an increase in predators cause an increase in prey?
The predators eat the prey, then the smaller population of prey means there is too much competition for food so the predator population crashes. This allows the prey population to boom as they are predated on less.
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Why are the fluctuations in predator/prey population size in natural ecosystems less severe?
The predators eat a range of foods.
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Card 2

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How do predators evolve?

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Faster movement, camouflage, better means of detecting prey.

Card 3

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How do prey evolve?

Back

Preview of the front of card 3

Card 4

Front

What is predation?

Back

Preview of the front of card 4

Card 5

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Why are prey normally exterminated by predators in a lab environment?

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