ch4 Flashcards
population
•is the number of all the organisms of the same group or species, which live in a particular geographical area, and have the capability of interbreeding.
Current Population Trends
- Amplifies all environmental problems
- Largest increase expected in developing countries (approximately 97%)
- Decreasing in some developed countries
Population change equation
Population change = (Births + Immigration) – (Deaths + Emigration)
Crude birth rate
Crude birth rate = births per 1000 people in population per year
Crude death rate
= deaths per 1000 people in population per year
Total Fertility Rate (TFR)
•Number of children a woman has during her lifetime, averaged for population.
same as biotic potential (r)
Replacement Level Fertility
Number of children needed to replace everyone in the population.
•Varies between regions
- 1 with low infant mortality
- 5 with high infant mortality
Zero Population Growth
Birth rate equals death rate.
Sex Ratio-
•Relative number of males and females in a population
Age Distribution
Number of individuals of each age in a population
sex ratio and age distribution
•Together they tell how a population will grow
rapid growth (developing countries)
slow growth (developed countries)
zero growth (developed countries)
Navigation growth (developed countries)