RNR 1001 Chapter : RNR 1001 Jan 30th 5
Document Summary
Primary producers- autotrophs (bottom) --- primary consumers-herbivores- heterotroph---- secondary consumers- carnivores----tertiary consumers (top) Omnivores (eat both animals and plants); detritivores (eating dead animals) ; -- second law of thermodynamics (heat losing when transfer heat) e. g. sun (10,000kcal) to primary (1,000 kcal) to secondary (100 kcal) Trophic web interactions can have profound effects on living resources e. g. endangered species will appear when the change happens ( less food and more chance being ate) --- top-down control/ trophic cascade/bottom-up control: cycling of nutrients. Macronutrients include oxygen, carbon, nitrogen, hydrogen, and phosphorus. Micronutrients include zinc, copper, magnesium, iron and iodine (mass amount toxic) Nutrients levels are fixed, and some do not typically exist in useable forms. Example: nitrogen ---n2 (gas) is the main existence ---(nitrogen fixation: bacteria in the root) -- nh3 ammonia--- (nitrosifying bacteria: nitrosomonas)---- no2----- (nitrifying bacteria: nitrobacter) ----no3- (generally accepted by plants) Nutrients change through biological, geological and chemical processes: Biogeochemical cycle--- allowing the nutrients to flow and recycle.
