Chapter 5 Bio Cars
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12 terms
Terms | Definitions |
|---|---|
 Population density | the number of individuals per unit area. |
| age structure | the number of male and females of each age a population contains. |
| immigration | individuals move into a population's range from elsewhere. (population grows) |
| emigration | individuals leave a population's range (decrease in population) |
| exponential growth | growth where the population gets higher and higher rapidly. under ideal conditions with unlimited resources, a population will grow this way. |
| logistic growth | occurs when a population's growth slows and then stops, following a period of exponential growth. |
| carrying capacity | the maximum number of individuals of a particular species that a particular enviroment can support. |
| limiting factor | 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. |
| density-independent factors | 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. |
| demography | the study of a human population |
| demographic transition | dramatic change from high birthrates and death rates to low birthrates and death rates. |
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