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TROPHIC LEVELS & ENERGY FLOW
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Trophic = Food
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each step in a food chain or food web
Trophic Level each step in a food chain or food web
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It all BEGINS with the SUN
Sunlight is the main energy source for life on Earth Less than 1% is used by living things.
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1st Trophic Level Producers
Organisms that can capture energy from sunlight (photosynthesis) or chemicals (chemosynthesis) and use it to produce food from inorganic compounds Known as autotrophs Examples Plants Some algae
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Photosynthesis a process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and high-energy carbohydrates
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Photosynthesis Carbon dioxide + Water Carbohydrates + Oxygen
Light Energy Carbon dioxide + Water Carbohydrates + Oxygen
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Chemosynthesis a process by which some organisms such as certain bacteria, uses chemical energy to produce carbohydrates
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Chemosynthesis
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The Next Trophic Levels
Consumers Organisms that rely on other organisms for their energy and food supply Cannot make their own energy Known heterotrophs Different types of heterotrophs Herbivores Carnivores Omnivores Decomposer
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Herbivores Organisms that obtain energy by eating only plants
Known as 1st Level Consumer Examples Cows Caterpillars Deer
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Carnivores Organisms that obtain energy by eating only animals
Could be 2nd or 3rd Level Consumers Examples Snakes Owls Bobcats
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Omnivores Organisms that obtain energy by eating both plants and animals Could be 2nd or 3rd Level Consumers Examples Humans Bears Crows
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Detritivores Organisms that feed on plant and animal remains and other dead matter Similar to decomposers Example Earthworms Snails crabs
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Decomposers Organisms that break down and obtains energy from dead organic matter Example Mushrooms (fungi) Bacteria 15
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Energy Flow Only about 10% of the energy available within one trophic level is transferred to organisms at the next trophic level. The rest of the energy is lost as heat.
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Energy Flow
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Energy & Biomass Pyramid
PRODUCERS 1st Level CONSUMERS 2nd Level CONSUMERS 3rd Level CONSUMERS SUN 0 % ENERGY LEFT Decomposers Herbivores & Omnivores Carnivores & Omnivores Plants
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Energy & Matter Cycle (90%) (90%) (90%) Chemicals Producers
(What ever is left) Heat Chemicals Sun Basic elements of life: Sulfur, Phosphorus, Oxygen, Nitrogen, Carbon & Hydrogen (90%) Heat Producers Decomposers Bacteria, Moss, Mushrooms, etc. Consumers (90%) Heat (90%) Heat
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Exit Card What is an omnivore? Give me an example.
What is the process called when plants use light energy to convert CO₂ and water into carbohydrates and O₂? What is the percentage of available energy within one trophic level that to be transferred to an oraganism at the next level? What is a producer? Give me an example.
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