Ecology - Disturbance Succession
Terms
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- Intermediate disturbance hypothesis
- Moderate levels of disturbance can create conditions that foster greater species diversity than low or high levels of disturbance.
- Non-equilibrium model
- Communities are constantly changing after being buffeted by disturbances.
- Succession
- Sequential changes, following disturbance, in the biota occupying and affecting a site
- Primary succession
- The first species to arrive on a truly bare or sterilized space.
- Secondary succession
- When the space has been opened and depopulated, but some residual biota has survived.
- Degradative succession
- A species that populates a habitat that disappears over time. Examples: rotting log, infested acorn.
- Climax community
- The late succession stage in which the dominant species can replace itself - young of climax species can successfully recruit under established adults.
- Facilitation
- The earlier species has a positive effect on a later species.
- Inhibition
- The earlier species has a negative effect on later species.
- Tolerance
- The earlier species has no effect on a later species.
- Disturbance effect on food chains
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Disturbance may lengthen food chains because:
-Lower trophic levels are generally more susceptible to disturbance mortality.
-Early successional species are generally more edible.