Chpt.2.3
- 1. 2.3 Cycling of Matter
- 2. 3 Important Materials That Cycle Through Ecosystems Water Carbon Nitrogen As well as sulfur, calcium, and phosphorus among others
- 3. Energy is lost: at each transition from one trophic level to the next But the sun replenishes the energy Matter is recycled!
- 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. Water cycle plants absorb water through roots animals drink water or get it from food water is lost through respiration, excretion and decomposition of dead organisms Animated water cycle 6
- 7. 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
- 11. 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
- 12. 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
- 13. The nitrogen cycle (cont.)
- 16. 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
- 17. 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