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.
- Variety of genes. Humans have around 25,000
- Habitat diversity
- 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
- Conditions of habitat. E.g.
- 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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