Types of sampling

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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


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