11:216:352 Lecture Notes - Lecture 2: World Population, Nitrogen Fixation, Anthropocene

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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
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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