BIO 181 Lecture Notes - Lecture 5: Complete Protein, Metal Toxicity, Biomagnification
Document Summary
Interactions of all organism + abiotic factors at a given time and place. Water temp sunlight wind rain = abiotic (nonliving) at a given time/place. All incoming energy radiated back to outer space. About 90% of energy entering a trophic level unavailable to next level about 10% passed to next level. Food energy availability increases at lower trophic levels- meat is energetically expensive! Meat is energetically expensive- grain that could feed 10 humans will, if fed to a cow, feed only one human. Cattle fed on grass convert food unavailable to humans(grass) to available food(meat) Substances such as c, o2, h2o, p, n compounds etc. Decay of dead organisms and wastes releases nutrients back into the environment for use by organisms. Entry point of nutrients into biotic stages of the cycle. Crucial- decay releases nutrients from waters and dead organisms into the environment for reuse this is the major difference between energy flow and nutrient cycling.
