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22 Cards in this Set
- Front
- Back
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Limiting factor
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the factor changes the average or equilibrium density of a pop.
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"bottom up limitation"
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pop abundance limited by available resources
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"top down limitations"
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abundance determined by pop's consumer's
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Regulating factor
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keeps pop within a certain interval around the avrg or equilibrium abundance
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Keystone species
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species that consumes and limits the pop of another species that would otherwise dominate the system
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Disturbance
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event that frees up resources &/or habs by removing orgs
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Peterbation
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more general than a dist, species additions and deletions, gradual changes in factors as well as dists.
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Stress
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anything that lowers the efficiency of an org below optimal level
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Intensity
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strength of dist. force
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Severity
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residue biota left
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Frequency
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return time of dist
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Magnitude
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spatial extent of dist relative to pop distrib.
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Distrib over habitat
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concentrated or patchy
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Timing
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season
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Succesion
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sequential changes, following dist, in the dominant biota occupying and affecting a site
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degradative succesion
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habitat dissapears over time (rotten log)
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primary succ.
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on bare space>>abiotic (volcanic rock)
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secondary succ.
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space has been opened a depop'd but some residual biota has survived
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climax
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late succ. stage where dominant species can replace themselves, they can succesfully recruit. (redwood).
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Early succesional species:
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-r-selected
-can tolerate harsh, abrasive conditions |
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Late Succ. species
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-k selected
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Species of life
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10-30 mill, but only 1.8 identified
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