Important Terms - Lecture 20

Ecosystems and the Biosphere

Syllabus	Schedule	Critique guidelines
Sample exam questions	Intro bio mission statement	Lecture list
	Previous lecture	Discussion questions

Ecosystem	Precipitation, evapotranspiration
Biosphere	Carbon cycle
Primary producers	Nitrogen cycle
Primary & secondary consumers	Nitrogen fixation
Detritivores	Nitrification
Energy flow	Denitrification
Gross vs. net primary productivity	Ammonification
Biomass	Phosphorus cycle
Standing crop	Leaching, sedimentation
Biogeochemical cycles	Gaia hypothesis

Describe some of the effects that humans have had on ecosystems.

How can increasing CO2 levels in the atmosphere act as a stimulant for plant growth? What about for plants that live in areas where nitrogen is extremely limiting?

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