# Samping Methods (Ecology)

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• Created on: 04-05-16 18:57
A square used to estimate the population size of a species, they are usually 1m².
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Define sample/sample size.
A smaller representation of a population is called a sample.
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Define random sampling.
A sample that is taken with no system in place i.e. blind.
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Define population.
The total number of organisms of a particular species found in an ecosystem at any one time.
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How do you use a quadrat?
Place the quadrat on the area you are investigating/ Count the organisms in your quadrat/ Repeat this in 2 different areas of the place being investigated/ Calculate the average.
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When you use a quadrat and calculate the average, what does the average represent?
The population of organisms in your chosen area.
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How do you estimate the population size?
Work out the average number of species per m², multiply this by the total area.
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What is an artificial ecosystem?
In an artificial ecosystem you can control the temperature, light and "rain".
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Example of an artificial ecosystem?
A zoo.
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What is a natural ecosystem?
Not controlled by man, they have a greater and more diverse range of species in them compared to artificial ecosystems.
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Example of a natural ecosystem?
The rainforest.
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What is a pitfall trap?
Device useful in sampling active, mobile animals.
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What is a pooter used for?
Small insects.
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How do you use a pooter?
The user breathes in through the mouthpiece which has a piece of net covering it. The insects are sucked into the holding chamber via the inlet tube.
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Where are sweep nets used?
They are used in areas of long grass to catch organisms. They can also be used in ponds.
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What are Pitfall traps used for?
To catch small, crawling insects.
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How do you use a pitfall trap?
They can be set up and left overnight to catch nocturnal species. All organsisms caught should be released unharmed.
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How do you use a line transect?
By counting species on a line e.g. 10m.
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## Other cards in this set

### Card 2

#### Front

Define sample/sample size.

#### Back

A smaller representation of a population is called a sample.

### Card 3

#### Front

Define random sampling.

### Card 4

#### Front

Define population.

### Card 5

#### Front

How do you use a quadrat?