| A | B |
|---|
| Population density | The number of organisms per unit area |
| Disperson | The pattern of spacing within a population within an area |
| Density-independent factor | Any factor in the environment that does not depend on the number of members in a population: usually abiotic factors like weather events |
| Density-dependent factor | Any factor in the environment that depends on the number of members in a population: usually biotic factors like predation, disease, parasites, and competition |
| Population growth rate | How fast a given population grows |
| Emigration | The number of individuals moving away from a population |
| Immigration | The number of individuals moving into a population |
| Carrying capacity | The maximum number of individuals in a species that an environment can support for the long term |
| Limiting factor | Biotic or abiotic factors that keep a population from continuing to increase indefinitely |
| R-strategist | Organisms with a shorter life span who produce many offspring: usually smaller organisms |
| K-strategist | Organisms with a longer life span who produce less offspring but invest in the care for the young: usually larger organisms |
| Demography | The study of human population size, density, distribution, movement, and birth/death rates |
| Demographic transition | A change in a population from high birth/death rates to low birth/death rates |
| Zero population growth (ZPG) | Occurs when births plus immigration equals deaths plus emigration |
| Age structure | The number of males and females in each of three age groups: pre-reproductive, reproductive, and post-reproductive |
