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15 Cards in this Set

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Density
number of individuals in some specified area of habitat
Distribution
pattern in which the individuals are dispersed
Immigration
New individuals permanently move into an area.
Emigration
Individuals leave a population.
Migration
Recurring movement of organisms from one region to another, then back.
Zero Population Growth
No overall increase or decrease in population size during a specified interval.
Exponential growth
An increase in population size by a fixed percentage of the whole in a given interval.
Biotic potential
The maximum rate of increase of a population under ideal conditions.
Carrying Capacity
The maximum number of individuals in a population (or species) that a given environment can sustain indefinitely.
Logistic growth
The size of a population increases slowly, then rapidly, then levels off as the carrying capacity is reached.
Density-dependent
Factor that operates at high population density to slow birth rate and/or increase death rate (e.g., disease, competition).
Density-independent
Factor that impacts a population’s birth rate or death rate regardless of density (e.g., fire or flood).
Types I,II,&III
Type I large mammals
Type II birds, lizards, small mammals
Type III invertebrates, fishes, plants, fungi
Total Fertility Rate
TFR. Within a population, the average number of children born to a woman during her reproductive years.
Demographic transitions
A population’s vital statistics (e.g., size, distribution, density, age structure).