Trophic Levels and Pyramids. Mrs. A. Kay. Trophic Levels. Trophic = feeding level refers to the organisms position in the food chain Autotrophs are at the base (first trophic level). Organisms that eat autotrophs are called herbivores or primary consumers (second trophic level).
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Mrs. A. Kay
Think!! You can’t support a population on a 0.000001% of stored energy.
Ex: 20 000kg of cow
more bacteria on the
bottom, less fish on top
bacteria are microscopic and
have extremely small mass (also reproduce more quickly) so will have small biomass, but supports the system.