Principles of Ecology
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Created by:
katfesperman on August 23, 2007
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20 terms
Terms | Definitions |
|---|---|
 abtoitic factor | nonliving parts of an organism's enviroment; temperature, moisture, light and soil |
| biosphere | portion of earth tha supports life; extends from the atmosphere to the bottom of oceans |
| biotic factor | all the living organisms that inhabit an enviroment |
| commensalism | an ecological relationship in wich one organism benefits and the other neihter benefits nor is harmed |
| community | collection of several interacting popultions that inhabit a common enviroment |
| ecology | scientific study of interactions amoung organisms and their enviroments |
| ecosystem | interactions amoung populations in a community; the community's physical surroundings' or abiotic factors |
| habitat | place where an organism lives out its life |
| mutualism | a form of symbiosis in wich both organisms benefit from living togeather |
| niche | role and position a species has in its environment; includes all biotic and abiotic interactions as an animal meets its needs for suvival and reproduction |
| parasitism | symbiotic relationship in which one organism benefits at the expense of the other species |
| population | group of organisms of one species that interbreed and live in the same place at the same time |
| symbiosis | permanet, close association between twoor more organisms of diffrent species |
| autotroph | organisms that use energy from the sun or energy stored in chemical compounds to manufacture their own nutrients |
| decomposer | organisms, such as fungi, that break down and absorb nutrients from dead organisms |
| food chain | beginning with procedures along wich energy is transferred from trophic level to troshic level |
| food web | the interconnected food chains in an ecosystem |
| heterotrogh | organisms that cannot make their own food and must feed on other organisms for energy and nutrients |
| scavenger | animals that feed on animals that have already died |
| trophic level | a feeding level in an ecosystem |
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