19 terms

Biology Chapter 5 - Populations

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population density
Number of individuals per unit area
age structure
Number of males and females of each age in a population
immigration
Movement of individuals into an area occupied by an existing population
emigration
Movement of individuals out of an area
exponential growth
Growth pattern in which the individuals in a population reproduce at a constant rate
logistic growth
Growth pattern in which a population's growth rate slows or stops following a period of exponential growth
carrying capacity
Largest number of individuals of a particular species that a particular environment can support
limiting factor (definition)
Factor that causes the growth of a population to decrease
density-dependent limiting factor (definition)
Limiting factor that depends on population density
density-independent limiting factor (definition)
Limiting factor that affects all populations in similar ways, regardless of the population density
demography
Scientific study of human populations.
demographic transition
change in a population from high birth and death rates to low birth and death rates
geographic range
the area inhabited by a population
population distribution
how individuals in a population are spread out across the range of a population
growth rate
Rate of increase or decrease of a population
factors that can affect population size
birthrate, death rate, rate at which individuals enter or leave the population
examples of density dependent limiting factors
competition, predation, herbivory, parasitism, disease, stress from overcrowding
humans as predators
human activity which limits populations
examples of density independent limiting factors
natural disasters and unusual weather
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