Presentation on theme: "3.2 Energy Flow Main source of energy for life on Earth? Sun Less than 1% used by living things *some organisms rely on energy stored in inorganic chemical."— Presentation transcript:
3.2 Energy Flow Main source of energy for life on Earth? Sun Less than 1% used by living things *some organisms rely on energy stored in inorganic chemical compounds
Autotrophs/Producers capture energy from sunlight or chemicals and use it to produce food Plants, algae, bacteria (cyanobacteria, salt marsh) They are VERY important to energy flow in the biosphere
Photosynthetic bacteria cyanobacteria Tidal marsh salt marsh
Trophic Levels Each step in a food chain or food web Producers = 1 st trophic level Consumers = 2 nd, trophic level (3 rd, 4 th, etc) Only about 10% of the energy available within one trophic level is transferred to organisms at the next trophic level
What shapes an ecosystem? Biotic factors-the biological influences on organisms w/i an ecosystem Examples: Abiotic factors-nonliving factors that shape ecosystems Examples:
Biotic and abiotic factors determine the survival and growth of an organism and the productivity of the ecosystem in which it lives Habitat-the area an organism lives (includes biotic and abiotic factors) Niche-full range of physical and biological conditions in which an organism lives and the way it uses the conditions
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