Biology - Distribution of organisms

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What physical factors affect the distribution of organisms?
Temperature, amount of light and the availability of light/nutrients/oxygen/carbon dioxide.
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What are two things are used to help collect quantitive data about organisms in their habitat?
Transects and quadrats.
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What is a transect?
A line across a habitat or part of a habitat, can be simple as a piece of string or rope placed in a line on the ground.
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Where is the number of organisms or species observed and recorded?
At regular intervals along the transect.
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What is a quadrat?
Usually a square made of metal and may contain further wires to mark smaller areas inside.
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How are the number or organisms observed and recorded?
The number of tehm in the quadrat or small section of a quadrat are counted.
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How is a representive sample taken using a quadrat?
It should be placed randomly.
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The more quadrats that are anylysed, the better the what?
The vadility and reproductivabilty of the results.
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What can quadrats also be used for apart from organisms?
For slow moving animals.
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Other cards in this set

Card 2

Front

What are two things are used to help collect quantitive data about organisms in their habitat?

Back

Transects and quadrats.

Card 3

Front

What is a transect?

Back

Preview of the front of card 3

Card 4

Front

Where is the number of organisms or species observed and recorded?

Back

Preview of the front of card 4

Card 5

Front

What is a quadrat?

Back

Preview of the front of card 5
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