Colourful, easy to follow , comprehensive notes on population ecology. Includes index, pictures, diagrams and highlighted important points. Follows both the IEB Sags document as well as the DBE module guide. Perfect for matric and grade 11 last minute exam revision.
Levels of population ecology
Individual – one organism.
Population – many individuals of the same species in a specific area. (Populations
fluctuate seasonally depending on the amount of recourses available.)
Community – many populations interacting within an area.
Ecosystem – biotic and abiotic factors interacting within an area.
What affects the size of a population?
Natality – birth rate. Causes an increase in the population
Immigration – individuals move into a population and stay.
Mortality – death rate.
Emigration – individuals leave a population and do not Causes a decrease in the population
return.
Populations
Population – many individuals of the same species in a specific area.
Stable populations Unstable populations
– fluctuate around the carrying capacity -Population exceeds the carry capacity. (Habitat
- Stable populations have birth and death rates that are deteriorates rapidly)
relatively balanced.
- Unstable populations experience rapid growth or decline
- Fluctuations occur as births and deaths adjust to maintain
due to imbalances in birth and death rates.
equilibrium around the carrying capacity.
- Factors such as sudden changes in resources, predation,
- Environmental conditions, resource availability, and
disease, or environmental disturbances can disrupt the
population density influence birth and death rates in stable
balance, leading to unstable population dynamics.
populations.
, Grade 11 & 12
Life science
Population
ecology
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