Investigating populations
- Created by: emma
- Created on: 20-11-14 20:49
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- Investigating Populations
- Ecology
- Species
- A group of closely related organisms capable of interbreeding and producing fertile offspring
- Population
- All individuals of a species living together in the same area at the same time
- Community
- All individuals of all species living together in the same area at the same time
- Habitat
- Where an organism lives in an ecosystem
- Niche
- Where an organism lives, what it does, what it feeds on and how it interacts with other organisms
- Biotic factor
- Living factor that affects distribution of an organism
- Competition, Predation, Disease
- Abiotic factor
- Non living factor that affect the distribution of an organism
- Light, CO2, PH, Temperature
- Species
- Abundance
- Population density
- Actual count of individuals present
- Percentage cover
- Area of a quadrat covered by a species recorded as percentage of total area
- Frequency
- Proportion of quadrats that contain a particular species
- Population density
- Random Quadratting
- Place two measuring tapes at right angles to one another (create grid)
- Generate random coordinates on calculator
- Place quadrat at intersect
- Measure abundance
- Place quadrat at intersect
- Generate random coordinates on calculator
- What species present and abundance
- Compare two areas
- Compare one area at different times
- Place two measuring tapes at right angles to one another (create grid)
- Systematic sampling
- Place tape measure to create transect line across area
- Generate random numbers to decide intervals the quadrat will be placed at along line
- Place quadrats and measure abundance
- Generate random numbers to decide intervals the quadrat will be placed at along line
- Measure how diversity changes over area
- Place tape measure to create transect line across area
- Mark release recapture
- Method
- Species collected counted and marked
- Species then released and allowed time to redistribute
- Second capture of the species which counts number of species caught and number of them already marked
- N1 X N2 /Nm
- Second capture of the species which counts number of species caught and number of them already marked
- Species then released and allowed time to redistribute
- Species collected counted and marked
- Ethics
- Studied in situ or returned to same spot even if dead
- Few individuals removed as possible
- Minimal damage
- Sites not over used
- Minimal damage
- Few individuals removed as possible
- Studied in situ or returned to same spot even if dead
- Method
- Ecology
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