BIOL 2060 Lecture 26: primary production and energy flow
19 Apr 2016
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Document Summary
Chlorophyll takes in light energy used to synthesize sugars. Sugars stored as biomass and used for growth: consumed by heterotrophs. System absorbs, transforms, stores energy, water, nutrients: in which the physical, chemical and biological structures and processes are inseparable. A biological community plus all abiotic factors influencing it. Lots of npp in tropics: pp decreases as we move away from the tropics north or south, pp low in the oceans around the tropics. Latitudinal and seasonal gradients exist in npp: total npp is solid line, npp of land is dotted line, npp of ocean is dashed line. Trophic level: position in a food web determined by the number of energy transfers from primary producers to the level being observed: 1 primary producers, 2 primary consumers, 3 secondary consumers, 4 tertiary consumers. Global net primary production (npp: npp in the ocean, by season. Stays relatively constant across seasons still see latitudinal increases around subtropics.
