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number of individuals per unit of area or volume, e

Biology

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1. number of individuals per unit of area or volume, e.g. persons/sq mile
2. the general patter in which the population members are dispersed through its habitat, may be: Clumped (most common), Uniformly dispersed (rare), or Randomly dispersed
3. defines the relative proportions of individuals of each age: Pre-reproductive, Reproductive, and Post-reproductive
4. population size is dependent on births, immigration, deaths, and emigration
5. designates a near balance of births and deaths
6. G = rN
   G = Population growth per unit time
   r = rate of increase
   N = the number of individuals
7. one variable increases much faster than the other (J shaped graph)
8. population lives under ideal conditions.
   the maximum rate of increase under ideal conditions.
   few populations live under ideal conditions because a number of factors limit their growth
9. any resource that is in short supply, e.g. food, minerals, light, living space, refuge from predators, etc.
10. maximum number of individuals of a species or population a given environment can sustain. Each habitat can only support so many individuals