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Ecosystems (Key terms (Habitat (The place where an organism lives),…
Ecosystems
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Quadrats
If more quadrats are analysed, it is more valid
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If you are looking for a change, place the quadrats in consistent measured intervals
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Collecting ogranisms
Pooters
It has two tubes - one goes into your mouth so you can apply suction, and the other goes over the insect so that is sucked into the jar.
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Pitfall traps
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The top of the container is level with the soil surface, and it is covered by a piece of wood with a slight gap to allow insects to climb in
It is important to check the trap regularly to avoid the animals escaping or being eaten before they are counted.
Sweep nets
Useful when collecting insects from bushes, long grass and ponds
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Capture mark recapture
Method
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- Animals are marked in a harmless way and released
- traps are used again a few days later
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- the population size is estimated
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Abiotic factors
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pH
The pH of soil, rainwater, and water in rivers and ponds, can be measured using a pH probe and meter