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  1. 1. 2.3 Cycling of Matter
  2. 2. 3 Important Materials That Cycle Through EcosystemsWaterCarbonNitrogenAs well as sulfur, calcium, and phosphorus among others
  3. 3. Energy is lost:at each transition from one trophic level to the nextBut the sun replenishes the energyMatter is recycled!
  4. 4. Matter in the form of nutrients also moves through the organisms at each trophic levelThe atoms of elements that make up the bodies of organisms alive today are the same atoms that have been on Earth since life began
  5. 5. Water cycleplants absorb water through roots 6animals drink water or get it from foodwater is lost through respiration, excretion and decomposition of dead organismsAnimated water cycle
  6. 6. The Carbon Cyclecarbon is found as CO2 in the atmosphere & oceanproducers (terrestrial & aquatic) use CO2 in photosynthesis to make sugarphotosynthesis = CO2 + H2O -> carbs.respiration & decay return CO2 to the atmosphereburning returns CO2 to atmosphere
  7. 7. 10
  8. 8. The Nitrogen Cyclemakes up 78% of the atmosphereliving things cannot use nitrogen in atmospheric formlightening and bacteria “fix’ into usable compounds called nitratesplants convert nitrates into molecules containing nitrogen
  9. 9. The Nitrogen Cycle (cont.)animals change these molecules into animal proteinsduring digestion, humans convert plant & animal proteins into human proteinsdecay returns nitrogen to the atmosphere
  10. 10. The nitrogen cycle (cont.)
  11. 11. 13
  12. 12. The Phosphorus Cycleshort term cycle - plants use phosphorus from the soil into body tissuesanimals get phosphorus by eating plantsdecay returns phosphorus to the soil
  13. 13. The Phosphorus Cyclelong term cycle - phosphorus washed into the sea becomes incorporated into rockyears later rock containing phosphorus is exposed - phosphorus is released