BIL 160 Chapter Notes - Chapter 55: Primary Production, Photic Zone, Nitrogen Cycle
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28 Apr 2016
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Sum of all organisms living in a given area and the abiotic factors with which they interact. Energy flow and chemical cycling cannot be described using population or community phenomena. Physical laws govern energy flow and chemical cycling: 1st law thermodynamics = energy cannot be created or destroyed, 2nd law = every energy exchange increases entropy of the universe. Law of conservation of mass says matter cannot be created or destroyed: b/c mass conserved, we can determine how much of a chemical element cycles within an ecosystem or gained/lost by it over time. Energy, mass and trophic levels: group species into trophic levels based on source of nutrition and energy, primary producers = autotrophs use photosynthesis (plants) Organisms in above trophic levels are heterotrophs: herbivores which eat plants called primary consumers, carnivores that eat herbivores called secondary consumers, carnivores that eat carnivores called tertiary consumers, detritivores are decomposers that get energy from detritus.
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