11:216:352 Lecture Notes - Lecture 2: World Population, Nitrogen Fixation, Anthropocene
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Published on 27 Feb 2018
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Chapter 1 Web of life
● Concept 1 : Events in the natural world are interconnected
○ Can be direct or indirect
● Concept 2: Ecology is the scientific study of interactions between organisms and their
environment
● Concept 3: Ecologists evaluate competing hypotheses about natural systems with
observations, experiments, and models.
Ecosystems & biosphere- translational ecology
● Ecology is the scientific study of how organisms affect, and are affected by, other
organisms and their environment.
World Human population growth
● River dams, water use, fertilizer use
Human domination
● Agricultural and urbanization
● Climate change
● Extinctions and invasive species
● Acidification(unintended consequence), nutrient enrichment, and deoxygenation of water
Anthropocene- human age domination
Nitrogen fixation
Haber- Bosch Process
1918 Nobel Prize awarded to Haber for synthesis of NH3
N2(g) + 3H2(g) = 2NH3(G)
Nitrogen increased dramatically over last 150 years(Used for fertilizer)
100lb N lost 86% to environement. Ends up in rivers(25%)
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