Unit 3 Flashcards
How can population growth affect the environment
Deforestation
Industrialization
Pollito.
More green house gas emissions in largely populated areas
Four factors that affect a global population growth
Death rate
Birth rate
Immigration rate
Emigration rate
The equation connecting population growth factors
Local: (birth rate - death rate) (immigration rate - emigration rate)
Define exponential growth + graph
Accelerating growth thst occurs when there is a constant growth rate over time
Logistic population growth graph
Exponential growth at first, then graph slices as carrying capacity gets closer
Looks like a slanted S
What is the rule of 70
years it takes for a population to double I’d based on rule of 70
Equation: doubling time = 70/growth rate
Environmental resistance definition
Limits set by environment on population growth
- resources
- Predation
- competition
- disease
- Webster
Carrying capacity, why is it dynamic
Max # if species that an environment can support for an indefinite period of time
Easily fluctuates due to resource availability, weather, habit changes
Reproductive factors that affect how quickly a species population grows
Age of reproduction
Length of reproductive process
# offspring per litter
# reproductive periods per life time
Chances offspring live to adult hood
R selected pecios
High reproduction rate
Minimal parental daré
Short lifespan
Ex. Mosquitos
K selected species
Low reproduction rates
High parental care
Lower lifespans
Ex. Elephant
Current world population
8.2 billion
Why increase in population in 1800
Rise in jobs
Advancements weave to support more people
Total fertility rate , why has it decreased in recent years
Avg # of female of a population in her life time
Decreased because of lower death rates in children more edu. For women, contraceptives, reproductive healthcare
Replacement level fertility
of children a couple has go have to replace themselves (normally 2)
