3 Important Materials That Cycle Through EcosystemsWaterCarbonNitrogenAs well as sulfur, calcium, and phosphorus among others
Energy is lost:at each transition from one trophic level to the nextBut the sun replenishes the energyMatter is recycled!
Matter in the form of nutrients also moves through the organisms at each trophic levelThe atoms of elements that make up the bodies of organisms alive today are the same atoms that have been on Earth since life began
Water cycleplants absorb water through roots 6animals drink water or get it from foodwater is lost through respiration, excretion and decomposition of dead organismsAnimated water cycle
The Carbon Cyclecarbon is found as CO2 in the atmosphere & oceanproducers (terrestrial & aquatic) use CO2 in photosynthesis to make sugarphotosynthesis = CO2 + H2O -> carbs.respiration & decay return CO2 to the atmosphereburning returns CO2 to atmosphere
The Nitrogen Cyclemakes up 78% of the atmosphereliving things cannot use nitrogen in atmospheric formlightening and bacteria “fix’ into usable compounds called nitratesplants convert nitrates into molecules containing nitrogen
The Nitrogen Cycle (cont.)animals change these molecules into animal proteinsduring digestion, humans convert plant & animal proteins into human proteinsdecay returns nitrogen to the atmosphere