Populations
- Created by: Sophia Dowden
- Created on: 29-05-16 15:13
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- Population
- A population is a group of individuals of the same species living in the same habitat at the same time.
- Populations are also described as DYNAMIC -it will change
- Changes in population
- Birth rate - death rate - Immigration - Emigration - (factors that affect populations density)
- These changes affect the population density i.e the number of individuals per unit area.
- Birth rate increases = population would increase. (in that area)
- These changes affect the population density i.e the number of individuals per unit area.
- Birth rate - death rate - Immigration - Emigration - (factors that affect populations density)
- Abiotic - non-living factors
- Light
- Temperature
- Wind and water currents
- Water availability
- Oxygen availability
- Soil structure
- Mineral content of soil
- Toxic waste
- Weather
- Density independent factors = the effect of these factors on the population will remain the same regardless of it's size.
- Biotic factors -living factors
- Competition
- Predation
- Parasitism
- disease
- Overcrowding
- Density dependent factors = the effect the factor has on a population is dependent of the size of the population size itself.
- Competition
- Intra-specific Competiton
- Competition between individuals of the same species.
- This type of competition is density dependent since, as the population increases, a greater proportion of the population fails to survive.
- This has value to a population since organisms tend to produce more offspring than the habitat can support.
- Those organisms that are best adapted have a better chance of survival.
- This has value to a population since organisms tend to produce more offspring than the habitat can support.
- This type of competition is density dependent since, as the population increases, a greater proportion of the population fails to survive.
- Competition between individuals of the same species.
- Inter-specific competiton
- Competition between individuals of different species.
- Each species occupies a particular place or NICHE, in an ecosystem.
- This is not only the particular physical space it occupies but also the role it carries out within the community.
- In the long term, two species cannot occupy the same niche in a specific habitat.
- This is not only the particular physical space it occupies but also the role it carries out within the community.
- Each species occupies a particular place or NICHE, in an ecosystem.
- Competition between individuals of different species.
- Intra-specific Competiton
- A population is a group of individuals of the same species living in the same habitat at the same time.
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