Types of sampling
- Created by: beebsbubbly
- Created on: 04-05-21 15:18
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- Types of sampling
- Random
- How is it carried out: sample sites in habitat randomly selected through the use of random number generator to select pairs of coordinates
- Advantages: data not biased
- Drawbacks: some areas in a habitat may be missed, species with a low presence missed causing an underestimat-on of biodiversity
- Non random - Opportunistic
- How it is carried out: sampler specifically and deliberately selects an area where they know the species are present
- Advantages: Easier and quicker
- Drawbacks: data may be biased and overestimate biodiversity (species evenness)
- Non random - Stratified
- How it is carried out: dividing a habitat into areas which visibly appear different and sampling each separately
- Advantages: ensures all areas of habitat are sampled, species are not underestimat-ed
- Drawbacks: Could possibly overestimate biodiversity if lots of samples are taken in small areas that look different but aren't
- Non random - Systematic
- How it is carried out: samples taken at fixed intervals across habitat using line transects and belt transects
- Advantages: very useful where the habitat shows a clear change across it e.g. from sea shore to sand dunes to woodland
- Drawbacks: only species within belt or that touch line are recorded and others could be missed, could underestimate biodiversity
- Line transects: very narrow sample as only sample things along the line
- Belt transects: sample inbetween so is more representative. You can use a quadrat at fixed intervals
- Random
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