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Life Sciences Population Ecology IEB
These slides comprehensively cover population ecology as covered in the IEB syllabus
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POPULATION ECOLOGYBased off of Mind Action Series Book: Tayla Owen-Jones
, Some Terms to know
Ecology: Study of the interactions of organisms with their physical and biological
environments and how these interactions determine the distribution and make up of
population within an ecosystem
Population Ecology: Fluctuations in population size and the factors that regulate
populations
Population: Group of organisms of the same species that also occupy the same are
can breed freely with each other, such as Elephant in the Kruger Park
Species: A group of organisms that share characteristics and are able to breed amon
themselves but with no other groups
For example: Different Breeds of dog’s can breed together but they cann
breed with cats
, Population Size and Factors that
can affect this
Population Size: Refers to the number of individuals in a population
This can increase due to Natality ( birth into the population) with both animals and
production of seeds
It can decrease due to Mortality (the death rate increasing) and can also be affected
Emigration ( Individuals leave a population and do not return) and Immigration
( individuals move into a population)
Populations will grow when birth and immigration exceed death and emigration and vis
They are stable when they equal each other
In a closed population ( no Immigration and Emigration) it will only be affected by birt
death rates
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