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Energy Flow through an Ecosystem Review of Ecosystem • “…is a community of living and non-living things that work together” (Ecosystems). • Abiotic: non-living/never been alive • Biotic: living or once was living • Three categories of living organisms – Producer – Consumer – Decomposer • Major parts of an ecosystem – Soil, atmosphere, heat and light, water, and living organisms New Terms • Population: same species • Community: made up of one to many species living in the same location. • Limiting resource: what the population needs to live • Carrying capacity: largest population that can be supported by the limiting resource Energy Budget • Gross productivity: eat or take in • Respiration: energy lost (usually through heat) • Net productivity: the difference between gross and respiration – Also known as biomass Start of energy • How does energy enter an ecosystem? – Plants = Photosynthesis – Balance equation • 6CO2 + 6H2O Sunlight C6H12O6 (food)+ 6O2 • What are plants called? Why are they called that? – Producers because they make their own food Flow of Energy through Organisms • Food web/chain – Determines the flow of energy • Producers, primary consumers, secondary consumers, and tertiary consumers – Energy is lost in the form of heat • Trophic levels – Energy levels – Link to other levels through food webs – Only 10% of energy is transferred to the next level • Example: if you start out with 100, then the next level only get 10% of that so it will have 10. The next level gets only 10% of the 10, so it will have 1. The next level would receive .10, then .01, then .001, and so on. What is the same and what is different?