EBIO 1030 Lecture 6: ebio dec 6
30 Jan 2019
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Document Summary
Ecosystem-an array of organisms and a physical environment, all interacting through a one way flow of energy and cycling of nutrients. Sustained by ongoing inputs of energy and nutrients. Biotic environment: the living component (all of the other organisms) Trophic levels- level on a food chain. Build organic compounds from co2 and water. Get energy and carbon from organic sources. Detritivores, eat small particles of organic matter (detritus) Decomposers, feed on organic wastes and remains and break them down into inorganic building blocks. Producers take up compounds from the environment. Energy flows one way then is lost. Biomass pyramid depicts dry weight of organisms at each trophic level in an. For some aquatic systems pyramid is inverted. Energy pyramid describes how energy diminishes as transferred up trophic levels. Always bottom heavy (largest tier is always producers) !0 percent of energy available in next trophic level. Substance becomes more concentrated as move up trophic levels.
