Ecology: populations
About this set
Created by:
Jiml05 on August 29, 2010
Subjects:
ncea, ncea level 2, biology, ecology
Description:
Ncea level 2 populations under ecology paper
Classes:
NCEA Level Two revision - Kingsway
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22 terms
Terms | Definitions |
|---|---|
 Population | A group of organisms of the same species living in an area |
| Community | All organisms in a particular area |
| Population size | can be found by direct count, sampling over quadrants, or by mark and recapture |
| Population density | the number of organisms per unit area |
| size of population over area of the habitat | formula for population density |
| population distribution | how population is spread out in an area |
| social relationships | Population distribution is often caused by distribution of resources and ______ ___________ |
| Clumped | A type of population distribution where: -individuals attract for protection -individuals gather around resources -plants are limited in dispersal by vegative propagation |
| Uniform | A type of population distribution where: -Individuals repel, giving space to feed, mate, and breed -Individuals gather around evenly distributed resources |
| Random | A type of population distribution where: -individuals do not affect the location of another -Individuals spread around evenly distributed resources -very common for plants |
| vegative propagation | plants often limited in dispersal by: |
| Natality | birth rate is known as |
| Mortality | death rate is known as |
| net migration rate | The net change in the number of individuals per unit of time due to immigration or emigration |
| population growth | Mortality, Natality, immigration and emigration affect the |
| rapid growth | populations becoming established in new areas may experience |
| Environmantal resistance | ________ _________ eventually slows growth and stabilises population |
| Fluctuations | as carrying capacity is reached, there will be ________ due to the variation in death and birth rate in response to the limiting factors |
| New limiting factor | this may reduce the carrying capacity. |
| Carrying capacity | The most individuals an ecosystem can support |
| limiting factors | Conditions in the environment that put limits on where an organism can live |
| population density | disease and predation increase as the ___________ _______ increases |
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