Helped me get an A+ in Biology in Matric. Summarises everything well making sure in-depth knowledge is attained. This topic is tested in matric and it is reminded that the IEB markers are looking for specific words in your definitions. These definitions given must be word-for-word. Enjoy!
POPULATION ECOLOGY
Interaction of organisms with their physical and biological environment
Terminology
Species
Group of organisms with similar characteristics which can interbreed to
produce fertile offspring
Habitat
Specific type of environment (area) in which a plant or animal species
normally occur
Population
Group of organisms of the same species that occur in a particular area
in a particular time so that interbreeding occurs
Community
Group of populations occurring in a particular area e.g., lion, zebra and
giraffe in a National Park.
Ecosystem
Interaction between the biotic factors and abiotic factors in a particular
area
Ecology
Study of mutual interaction among living organisms and environment in
which they live
Biosphere
Part of the earth where living organisms are found.
Size of a population
the number of individuals in a population
Population density
the number of individuals of the population per unit of area
Population Density = Number of People
Land Area
The unit of land area should be square miles or square kilometers
,Population parameters
Mortality – death rate of a population expressed as the number of death per
thousand individuals per year
How do you calculate the mortality rate
1. Find the number of deaths and the population size reported during
the specified period.
2. Divide the number of deaths by the population size.
3. Choose the exponent, n.
4. Multiply the result by 10ⁿ (eg: 1000) to get the result per every 10ⁿ
people.
Natality – birth rate of a population expressed as the number of live per
thousand individuals per year
, Immigration – one-way movement of organisms into an area
Emigration – one-way movement of organisms out of an area
Migration – moves from one place to another and returns to the original
place
Impact of population parameters
Natality and immigration cause an increase in population size.
Mortality and emigration cause a decrease in a population size.
No immigration or emigration in a closed population e.g. animals on an
island. (The only parameters affecting population numbers will be births
or deaths)
Natality and mortality can affect the population size in a closed
population.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller gracel. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R100,00. You're not tied to anything after your purchase.
