GEO 106 Lecture Notes - Lecture 9: Biotic Material, Minamata Disease, Western Shoshone
3 Dec 2017
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Standing state importance of variance over time. Can divide ecosystems into two parts: abiotic (never living). Temperature, dissolved oxygens in water: amount of abiotic materials at any one time in an ecosystem is called the standing state. Standing crop - total amount of living material in a trophic structure. Primary (feeds off of producers), secondary (eats primary), tertiary (eats secondary and perhaps primary) Relationships between species and trophic levels: what impacts on one will be spread to others. Amount of biomass at higher trophic levels is less than that below it. On average there is a 90% loss when energy is transferred from one level to the next (cid:894)e(cid:454). (cid:271)otto(cid:373) to (cid:373)iddle is 9(cid:1004)%, (cid:373)iddle to top is a(cid:374)othe(cid:396) 9(cid:1004)% (cid:895) Aside: lifestyle can feed more people off vegetation than off cattle on the same amount of land. If materials added to the system do not break down into their component parts the(cid:455) (cid:449)ill (cid:858)(cid:373)o(cid:448)e up(cid:859) the p(cid:455)(cid:396)a(cid:373)id.
