BIOL 1113 Lecture Notes - Lecture 7: Detritivore, Trophic Cascade, Photosynthesis

• School: Acadia University
• Department: Biology
• Course: BIOL 1113
• Professor: Dave Shutler

Document Summary

Trophic levels: autotrophs (= 1 degrees producers) convert only ~1. 5% of available solar energy to chemical (plants ~5%, solar panels ~15%, heterotrophs (= consumers) incl. most bacteria, all fungi and all other organisms on the planet, take energy. ), so food web (vs. chain: these food types, populations can change over course of year. More or less available, predators then change what foods they eat or avoid. Can change very quickly in very small spatial scale. Productivity: gross 1 degree = c initially fixed (units?) All c that is converted into sugars: net 1 degree = biomass produced by plants less resp. Is not usable (feces and urine) might be available to decomposers, but lost from that trophic level. Why so few big fierce animals: 100 g plants, ~10 g 1 consumer, ~1 g 2 consumer, ~0. 1 g 3 consumer .