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22 Cards in this Set

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