2.3 Flash Cards
Study
What Factors affect population growth rates?
- Sex Ratio (# females vs # males)
- Age Structure (# of females at reproductive age in the cohort)
- Generation Time (age at which females reproduce)
What is the Sex Ratio?
The number of females vs the number of males in a population
What is Age Structure?
The number of females at reproductive age in a population
What is Generation Time?
The age at which females reproduce in a population
What concerns are there with human population growth?
- Increased extraction of resources from the environment
- Burning of fossil fuels
- Increased use of fresh water
- Increased ecological impact (destruction of forests, etc)
- Increased fishing and hunting
- Spread of Invasive species
- Transmission of diseases
How many stages of demographic transition are there?
Five
Stage One of Demographic Transition
Birth Rate - High
Death Rate- High
Natural Increase- Stable or Slow Increase
Population Pyramid- Curves inward with a point at the top
Stage Two of Demographic Transition
Birth Rate- High
Death Rate- Falls Rapidly
Natural Increase- Rapid Increase
Population Pyramid- Equilateral triangle shape
Stage Three of Demographic Transition
Birth Rate- Falling
Death Rate- Falls more slowly
Natural Increase- Increase slows down
Population Pyramid- Equilateral triangle with a rectangle as the base
Stage Four of Demographic Transition
Birth Rate- Low
Death Rate- Low
Natural Increase- Falling then stable
Population Pyramid- Fingernail shaped
Stage Five of Demographic Transition
Birth Rate- Yet to be seen (Possibly falling further, possibly rising again)
Death Rate- Low
Natural Increase- Little Change
Population Pyramid- Fingernail shaped with a flared base
What type of programs would lead a Population from Stage 1 to Stage 4 of Demographic Transition?
- Education
- Women Empowerment
- Labor Market
- Family Planning
- Maternal and Child Health
Population Growth Formula
[(birth-death) / (population size)] * 100
What sex is more important when predicting off-spring?
Female
What will happen to resources with a bigger population size?
Resources will be deplenished