CHAPTER 22 NOTES

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  • Created by: ALK756
  • Created on: 25-10-15 12:27
If we are taking more of something than it's being replaced what are we doing?
We are overcropping that resource.
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What is abundance?
The abundance of a species is a measure of how many there are in an area.
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What are three factors that affect distribution and abundance?
1. Characteristics of the environment. e.g- light availability, tide movement. 2. Characteristics of the organism. e.g- what conditions they are adapted to. 3. Interactions between organisms. e.g- availability of prey, competition.
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What 4 factors determine population size?
Birth, death, immigration and emigration.
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What is exponential growth?
Occurs mainly in organisms that can reproduce quickly. E.g- insects,bacteria.
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What is intra-specific comptetion?
Competion between members of the same species for an environmental resource that is in limited supply.
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What is carrying capacity?
It's when the birth and death rate equalise.
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When trying to conserve a species, biologists must work out what?
Minimum viable population size.
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What are 2 reasons why chemical control of pests is undesirable?
It is generally expensive and chemicals can build up in ecosystems.
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Card 2

Front

What is abundance?

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The abundance of a species is a measure of how many there are in an area.

Card 3

Front

What are three factors that affect distribution and abundance?

Back

Preview of the front of card 3

Card 4

Front

What 4 factors determine population size?

Back

Preview of the front of card 4

Card 5

Front

What is exponential growth?

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