Terms in this set (9)
any event that has rapid and drastic effects on the community and ecosystem
can be small, localized (tree falling and creating a gap in the forest canopy)
can occur regularly (prairie fires or insect outbreaks)
a community that resists change and remains stable in spite of a disturbance (ecosystems with large biodiversity)
intermediate disturbance hypothesis
In general, we expect to see the highest species diversity at intermediate levels
Rare disturbances favor the best competitors, which outcompete other species.
Frequent disturbances eliminate most species except those that have evolved to live under such conditions.
At intermediate levels of disturbance, species from both extremes can persist.
Severe disturbances may eliminate all or most of the species in a community, initiating a series of changes
succession begins with the colonization of pioneer species
Pioneer species, spread over long distances easily, are adapted for growing quickly, and have a quick reproduction rate.
species that overtake pioneer species and out-compete them, helping restore the ecosystem to its prior disturbance state
An ecological succession that begins in an area where no biotic community previously existed, a disturbance removes all plant and soil life
Succession following a disturbance that destroys/alters a community without destroying the soil
ex: farming, fire, storms, and landslides
a community that is changed by a disturbance but returns to its original state
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