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# Monahan10 - Monahan 10 Ch 53(Dont need to stuff in the book...

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Monahan 10 Ch 53 (Don’t need to stuff in the book unless it’s covered in lecture) Fig 53-22 : Graph of human populations. - 6.5 billion people in 2000 - 1650 : human population increased relatively slowly until 1650, then it began to grow exponential. (due to change from open sewers to closed sewers) Video clip of “lots of people to feed and many needs to be met” Global carrying capacity - How many humans can the biosphere support? - Human carrying capacity potentially limited by food, water, energy, space, non- renewable resources, buildup of wastes, etc - Carrying capacity estimates range from 10-15 billion people Exponential Growth - use of differential calculus to express population growth as growth rate at a particular instant in time - change N/ change t = rN - N= population size, t= time, r = per capita rate of increase ( r = birth – death ) Fig 53.10 : J curves of population size as a function of number of generations - r = slope of graph Logistic model describes how a popuation grows more slowly as it nears it carrying capacity - exponential growth cannot be sustained for long in any population - a more realistic population model limits growth by incorporating carrying capacity - carrying capacity (K) is the maximum population size the environment can support. Logistic Growth Model

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Monahan10 - Monahan 10 Ch 53(Dont need to stuff in the book...

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