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Section 2: Energy Flow in Ecosystems

Section 2: Energy Flow in Ecosystems. Alec Haase , Brandon Geddis , Aalia Khan, and Travis Reed. Life Depends on the Sun. Photosynthesis: The process by which plants, algae and some bacteria use sunlight, carbon dioxide and water to produce carbohydrates and oxygen

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Section 2: Energy Flow in Ecosystems

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  1. Section 2:Energy Flow in Ecosystems Alec Haase, Brandon Geddis, Aalia Khan, and Travis Reed

  2. Life Depends on the Sun • Photosynthesis: The process by which plants, algae and some bacteria use sunlight, carbon dioxide and water to produce carbohydrates and oxygen • Energy from the sun enters ecosystems when plants use sunlight to make sugar molecules

  3. Producers • An organism that can make their own food are called producers, autotrophs, or self-feeders • Plants are all considered producers

  4. Consumers • An organism that get their energy by eating other organisms are called consumers • Consumers are also called heterotrophs or other-feeders

  5. Cellular Respiration • The process by which cells produce energy from the carbohydrates; atmospheric oxygen combines with glucose to form water and carbon dioxide. • Also known as the process by which cells break down food to yield energy • An organism obtains energy from the food it eats • Food must be broken down within its own body • During cellular respiration, cells absorb oxygen and use it to release energy from food. • Through cellular respiration, cells use glucose (sugar) and oxygen to produce carbon dioxide, water, and energy.

  6. Food Chains and Food Webs • A food web shows how many feeding relationships that are possible in an ecosystem. • Ecosystems almost always have more than one food web. • A food chain is a sequence in which energy is transferred from one organism to the next as each organism eats another. • Each time an organism consumes another an energy transfer occurs.

  7. Trophic Levels • Each time energy is transfer , some of the energy is lost as heat. • Therefore, less energy is available to organisms at higher trophic levels. • One way to visualize it is with an energy pyramid.

  8. Energy Loss affects Ecosystems • Decreasing amounts of energy at each trophic level affects the organization of an ecosystem. • Energy loss affects the number of organism at each level • Energy loss limits the number of trophic levels in an ecosystem.

  9. Video • http://www.youtube.com/watch?v=NVd9Ch44s_Y

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