Why may it sometimes be necessary to do non-random?
1) Habitats where theres a lot of variety in abiotic factors &/ distribution of species in the habitat 2) You want to make sure all the different areas/species are sampled
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Type of non-random?
Systematic sampling
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How to carry out sampling?
1) Choose area 2) Count no. of indivuiausl of each species 3) Repeat 4) Use results to estimate total no. of individuals/total no. of different species
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Where do you take samples in a systematic sample?
Fixed intervals
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What can frame quadrats be used to investigate?
Immobile populations
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3 types of sampling techniques that could be used to investigate plant populations?
1) Frame quadrats 2) Point quadrats 3) Transects
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How to measure rainfall
Rain gauge - rain falls into cylinder and then can measure volume
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How to measure humidity
The amount of water vapour in the air - hygrometer
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How to measure oxygen availability
Oxygen sensor - o2 dissolved in aquatic habitats
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How to measure solar input
Light sensor
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What are edaphic factors?
Soil conditions
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How to measure edaphic factors? (2)
1) pH (indicator liquid/electronic pH monitor) 2) Moisture content (before & after - dried out in oven)
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How to measure topography (2)
1) Relief - GPS 2) Slope angle - clinometer
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Other cards in this set
Card 2
Front
Why should you normally use random?
Back
To avoid bias
Card 3
Front
Why may it sometimes be necessary to do non-random?
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