EAS100 Lecture Notes - Lecture 26: Gaia Hypothesis, Photosynthesis, Logistic Function

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November 19 2014
ESB 3-27
Final Exam
Monday December 15
2:00 - 4:50pm
CCIS L2-200 (two floors down from main)
Photosynthesis
CO2 + H2O + energy -> CH2O + O2
Respiration
CH2O + O2 -> CO2 + H2O + energy
Given aundant resources, most populations show spectacular growth
If growth rate per individual is constant, population can grow exponentially.
Eventually, 'carying capacity' is reached, and then birth rate = death rate
"Logistic curve"
Self-regulating cycles
Increased vegitation productivity -> more O2 -> more forest fires -> less O2
Gaia Hypothesis
1) life has altered the enviroment at global scale throughout Earth history
2) Life tends to stabalize the enviroment as global scale by reducing
variability of physical and chemical factors
3) These alterations increase probability of persistance of life
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