Population
- Created by: rebekah
- Created on: 08-01-14 09:51
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- Population
- Population and ecosystems
- Ecosystem
- Made up of all the ineracting biotic (Living) and abiotic (non living) features in a specific area.
- Two major processes
- The flow of energy through the system
- The cycling of elements within the system
- Population
- Group on interbreeding organisms of one species in a habitat.
- Boundaries are often difficult to define.
- Populations of different species form a community
- Community
- Defined all the populations of different organisms living and interacting in a particular place a the same time.
- Community
- Habitat
- The place where a community live.
- Each habitat-smaller units-sub units with their own micro climate- microhabitat
- Ecological Niche
- Describes how an organism fits into the environment.
- Refers to where an organism lives and what it does their-no two species occupy the same niche.
- Ecosystem
- Investigative populations
- Types of sampling
- Point sampling-Individual points on a map chosen
- Line sampling
- Quadrate sampling-Used to sample a square area.
- Vary in size and shape.
- Can be used to measure:
- Species frequency
- Density
- % cover-scale of abundance
- Point quadrate-
- Gives a more objective assesment
- Record each species that touches a pin
- % cover is calculated by: Hits/pins X 100
- Gives a more objective assesment
- Random Sampling
- Minimizes personal bias
- Takes a sample of a whole area
- Systematic sampling
- sample taken in a regular fashion across an area-good for bias
- Need at least 20 samples
- Transects
- Along a line which systematic samples are taken
- Used to investigate transitions
- Often used with quadrates
- Types of sampling
- Population and ecosystems
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