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Trophic level:
- the position an organism occupies in a food chain
- Where we live: trees/plants are the most important
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Laws of Thermodynamics:
- 1. Energy is not created or destroyed in a closed system
- 2. When energy is transferred or transformed between units in a system, parts of the energy assumes a form that cannot pass any further
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Ecological efficiency:
the rate at which energy or biomass is transferred from one trophic level to the next
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Primary producers energy:
- 5.6% of energy converted to biomass, the rest lost to respiration
- the further up the chain, the less biomass is available
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10% rule:
only about 10% of energy from 1 trophic lvl to the next is converted into biomass (90% lost)
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Producers and Consumers MN Ex:
- Primary producers, primary, 2ndary consumers
- Bur Oak acorns, Muskrat, gold eagle
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Biomass pyramid:
- 10g m2 (2ndary consumers)100g m2 (primary consumers)
- 1000g m2 (producers)
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Carrying capacity:
- ('K'): estimates how many individuals of a particular organism can be supported by a specific habitat.
- (Ex: Producers- many; 2ndary consumers- few)
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From one trophic lvl to the next:
- size and number of individuals often scale by approx. factor of 10
- Ex: #1000, size 1; #100, size 10, etc)
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