GEOG 040 Lecture Notes - Lecture 15: Trophic Level, Biogeography, Ecotone
13 Dec 2018
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Document Summary
Biogeography is the study of the past and present geographic distribution of organisms on. Trophic hierarchy is the connections between and among organisms: shown in food webs which show the flow of energy, minerals and nutrients in an ecosystem. The biosphere uses . 1-. 3% of solar input. Moving up each trophic level, only 10% of the energy is transferred, 90% is lost: this is the 10% rule. Not everything in a lower level gets eaten, not everything that is eaten is digested and energy is constantly lost as heat. Inefficient transfer of energy structures ecosystems (1) producers represent the biggest amount of biomass but as you go up the trophic levels less and less individuals exist due to energy loss. Biomes are large, stable terrestrial ecosystems; 13 globally: characterized and named for specific and dominant plants which is dictated by the dominant climatic conditions. Like earth-sun relationships, topography, latitude, air and ocean circulation, maritime and continental effects.
