Population Change And The Environment Flashcards
How do you calculate a population’s doubling size?
70/growth rate (expressed as a %)
What is the formula for population growth rate?
(Birth-death+immigration-emigration)/pop size x100
What are some examples of density dependent factors?
Competition (for space, food, water, etc), parasitism, predation
What are some examples of density independent factors?
Natural disasters, like hurricanes or eruptions
How many people do we add per second? Per year?
2.5 per second, 79 million per year
What is the current growth rate for humans?
1%
When should zero population growth be achieved?
2100
What was the maximum passenger pigeon size?
5 billion
What country has the highest population? Highest density?
China; Bangladesh
The average number of children born per women during her lifetime is known as
Total fertility rate (TFR)
What is the TFR for the average American woman?
2.1
The TFR that keeps a population size stable is called the
Replacement fertility rate
What is the replacement fertility rate for humans?
2.1
WhT are the four stages of demographic transition?
Preindustrial, transitional, industrial, and postindustrial
In the US, more educated women have more/less children?
Less
