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