1. Populations

2. Population Change
Population Change = (birth-death) + (Immigrants-emigrants)
The maximum population depends on the biotic potential ( the maximum birth rate - the minimum death rate and the environmental resistance (limits of food space, predation and pollution and parasitism.

3. Growth Rate
The growth rate ( r ) = birth rate ( b ) - death rate ( d )
Example if birth rate is 1500/10,000 and death rate is 500/10,000 then r = .1 or 10%
The population growth would them be 10, %(10,000) or 11,000
The starting population for the next year would be 11,000

5. Exponential Growth The graph of exponential growth is a J shaped curve
The biotic potential depends upon the age of reproduction, the frequency of reproduction, the average number of offspring, the reproductive life span, and the average death rate

7. Some Examples
Bacteria divide every 20 minutes or 3 times an hour, if the population were not limited then in 48 hours a single bacterium would produce a layer 7 feet deep around the earth.
The current population of manatees approximately Females become reproductive at about age 3 and produce a single calf every other year for years. Only 1 in three infants survive. About 60 manatees die in boating accidents every year. What is happening to the population ??