Ecology Notes: 2/9/16-2/11/16
Ecology Notes: 2/9/16-2/11/16 ECOL1000
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This 0 page Class Notes was uploaded by Savannah Peat on Thursday February 4, 2016. The Class Notes belongs to ECOL1000 at University of Georgia taught by Dr. J Vaun McArthur in Spring 2016. Since its upload, it has received 22 views. For similar materials see Environmental Issues in Business at University of Georgia.
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Date Created: 02/04/16
21116 POPULATIONS Introductions 0 Let s look at E Coli 0 If it was unchecked it would cover the earth this is exponentllll growth 0 What limits growth Shown by Sigmoid 18 Curve 0 Human populations are growing exponentially too Predicting Human Population Growth 0 Thomas Malthus lived in 1700 s observed population growth in American colonies and saw that well being would decrease due to rapid human growth Limits to Growth Malthus studied human pops Darwin studied wildlife 0 Disease bubonic plague pops 0 War 0 Disease 0 Pestilence loctus and rats 0 Predation 0 Famine crop failure 0 Competition 0 Climatic A annofrnnkin BUBONIC PLAGUE 0 some local populations were limited but not overall population growth EXCEPT THE Back to the Sigmoid S curve 0 K carrying capacity of environment total N supportable 0 Human eming capacity max number of persons that can be supported in perpetuity on an area with given technology and consumptive habits without environmental degradation 0 At K birthsdeath 0 R 0001 and N does not grow 0 Every organism follows this law S Law cannot be broken 0 Ex Caddo Lake in Texas 0 Exponential growth is determined by an exponent 2A3 2A9 0 N0 number of individuals at beginning of observation period 0 Nt1 number of individuals at end of observation period How does N change over time 0 19 people who have lived are alive today 0 r intrinsic rate of increase 0 if r populations is growing 0 if r population is declining What in uences r 0 1 Birth rate 0 2 Death rate 0 3 immigration 0 4 emigration Or grows for people because of 0 modern medicine 0 better nutrition 0 less predation O cultural and religious enhancement 0 this population corresponds With ecological footprints What in uences ecological footprint 0 Population size 0 Consumption pattern 0 Impact population x a luence x technology Present world average 113
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