science: chpt. 4 big quiz Flashcards
The study of human population size, density, distribution, movement, and birth and death rates
Demography
When birthrate equals death rate
Zero population growth (ZPG)
The maximum number of individuals in a species that an environment can support
Carrying capacity
Use to describe the number of individuals moving away
Emigration
Use to describe the number of people coming into a population
Immigration
What are some density–independent factors?
Abiotic factors such as flooding, extreme heat or cold, tornadoes, hurricanes.
What are density–dependent factors?
Biotic factors such as predation, disease, parasites, and competition.
Number of organisms per unit area
Population density
The pattern of spacing in a population with in an area
Dispersion
What are the three types of dispersion?
- Uniform
- Clumped
- Random
