the number of individuals per unit area.
the number of male and females of each age a population contains.
individuals move into a population's range from elsewhere. (population grows)
individuals leave a population's range (decrease in population)
growth where the population gets higher and higher rapidly. under ideal conditions with unlimited resources, a population will grow this way.
occurs when a population's growth slows and then stops, following a period of exponential growth.
the maximum number of individuals of a particular species that a particular enviroment can support.
factor that controls the growth of a population.
density-dependent limiting factors
operate only when the population density reaches a certain level. includes: competition, predation, herbivory, parasitism, disease, and stress from overcrowding.
affect all populations in similar ways, regardless of population size and density. includes: unusual weather such as hurricanes and droughts, and natural disasters like fires.
the study of a human population
dramatic change from high birthrates and death rates to low birthrates and death rates.