Biodiversity

  • Created by: farahh24
  • Created on: 13-09-18 10:42
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  • Biodiversity
  • Types of biodiversity
    • Habitat diversity
      • Number of different habitats found within an area, e.g. meadow, woodland, etc
    • Species biodiversity
      • Species richness: number of different species in an area
      • Species evenness: comparison of number of individuals of each species
    • Genetic biodiversity:
      • Variety of genes. Humans have around 25,000
        • More genes = better adapted to a changing environment, more likely to be resistant to diseases.
  • Types of sampling
    • Random: mark out grid, use random numbers to determine coordinates
    • Non-random
      • Opportunistic: conveniently available. Least representative
      • Stratified: divided into strata/ subgroups based on characteristics and proportional sample taken from each strata
      • Systematic: different areas in habitat sampled separately.
  • Sampling: taking measurement of limited number of organisms.
  • Reliability
    • Sampling bias: can be reduced with stratified sampling
    • Chance: can be reduced with a larger sample groups
  • Sampling techniques
    • Pooter: for small insects
    • sweep nets - insects in areas with long grass
    • Tree-beating: invertebrates in trees/bush
    • Quadrats
    • Pitfall traps: crawling invertebrates
  • Calculating Biodiversity
  • Abiotic factors:
    • Conditions of habitat. E.g.
      • Wind speed - anemometer
      • Light intensity - light meter
      • Humidity - humidity sensor
      • pH - pH probe
      • Temperature - temp. probe
      • Oxygen content in water - dissolved oxygen probe
  • Reliability may also be affected by the individual's choices - e.g. being drawn to an area that appears more abundant in plants.

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