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Ch. 53 Population

TermDefinition
Population Ecology How factors affect a population’s size, dispersion, & age structure Ex: # loggerhead turtle hatchlings: survival affected by predation and light
Density # individuals per unit area or volume (Ex: 12 Oak trees/km2) Estimated by sampling Affected by birth/death rates & immigration/emigration Linked to pop's resources
Survivorship curves y= number of maximum individuals surviving, x = percentage of maximum life expectancy
Density Dependent mechanisms Density-dependent birth and death rates are an example of negative feedback that regulates a population’s growth
Life history traits that affect an organism’s schedule of repro and survival 3 Variables: When repro begins How often reproduce Number offspring per repro episode
K-selected: traits advantageous at high densities Seen in populations close to carrying capacity (K) Ex. Mature trees/old growth forest, humans, elephants
R-selected maximize repro success in uncrowded environments Seen in low density pops with little competition Ex. Weeds growing in empty field, rodents, insects
Footprint The land and water required by each person to produce all the resources they consume and to absorb all of the waste they generate.
Created by: nuhaSalim
 

 



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