Biology 1001A Lecture Notes - Extreme Poverty, Demographic Transition, Niche Differentiation
7 Dec 2012
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Document Summary
Agriculture: humans also don"t have any predators. Different continents have different values for r. Red bar is projected populations for the year 2025. Certain continents (asia, africa) are projected to increase whereas, (eurpoe) population size tends to be stable r reflects age structure. Difference in whether a population will increase or not is majorly due to age structure. Graph on the left (united states) seems like they will have a stable population because they have an equal age distribution \ Graph on the right (mexico)- the population will increase because there are many prereproductive individuals. Increasing n, but decreasing r: globally, r = 0. 012 or 1. 2% (per person per year) Population will increase as long as r is above 0. r is decreasing; however, the population is still growing because r is >0 (still positive) When population size decreases (aprox 2050) the harmful effects on the environment (global warming, pollution) will decrease.
