11energy - BIO 20 ENERGY 1 ENERGY FLOW 1. ECOSYSTEMS...

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BIO 20 ENERGY 1 ENERGY FLOW 1. ECOSYSTEMS ecosystem - community plus physical environment abiotic components - sunlight, soil, weather, inorganic autotrophs = producers - photosynthesis (green plants) - chemosynthesis (sulfur bacteria) heterotrophs - consumers (herbivores, carnivores) - decomposers (saprophages) 2. ENERGY FLOW sun - source of all energy on earth - thermal energy & light energy - 70% light reflected/absorbed by atmo 30% reach earth’s surface - plant capture 10% (assimilate 1%) energy flow - not closed in biosphere - originate outside, released into space primary productivity - rate energy captured by photosynthetic plants - lowest in tundra, desert, open ocean - high in trop. forest, coral reef, estuary secondary productivity - nutrients eaten eaten by consumers minus energy for metabolism 3. FOOD CHAINS food chain - linear sequence of energy transfer herbivores - food plentiful-low quality carnivores - primary or secondary
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This note was uploaded on 08/12/2010 for the course BIO 20 taught by Professor Hom during the Spring '08 term at City College of San Francisco.

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11energy - BIO 20 ENERGY 1 ENERGY FLOW 1. ECOSYSTEMS...

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