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Ch. 3 Communities
Community Ecology
| Term | Definition |
|---|---|
| communities | a group of interacting population that occupy the same area at the same time |
| tolerance | the ability of any organism to survive when subjected to abiotic factors or biotic factors |
| limiting factor | any abiotic or biotic factor that restricts the numbers, reproduction, or distribution of organisms |
| range of tolerance | for any environmental factor, there is an upper limit and lower limit that defines the condition in which an organism can survive |
| ecological succession | a change in an ecosystem that happens when one community replaces another as a result of changing abiotic and biotic factors |
| primary succession | establishment of a community in as area of exposed rock that does not have any topsoil |
| cause of primary succession | volcanic eruption followed by a large lava flow |
| secondary succession | the orderly and predictable change that takes place after a community of organisms has been removed but the soil has remained intact. |
| causes of secondary succession | flooding, tornado, hurricane, fire |
| climax community | the stable, mature community that results when there is little change in the composition of species |
| pioneer species | first organisms to appear after primary succession, form on bare rock and secrete acids to break down the rock, forming soils |
| examples of pioneer species (2) | lichens, moss |
Created by:
rajeckit
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