BISC 1112 Lecture Notes - Lecture 22: Nitrogen Fixation, Sewage Treatment, Eutrophication
15 May 2017
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Document Summary
% of food ingested that is assimilated (used by organism) = 100j/200j. % of assimilated energy not used for respiration= 33j/100j. % of energy transferred from one trophic level to next. Tends to decline as you move up the food chain. Enrichment of body of water with excess nutrients (n,p) usually due to runoff from land. Renewable goods or services derived from ecosystems functions that benefit human populations either directly or indirectly. Worth trillion/ year (about twice the global gross national product)
