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Energy flow through ecosystems

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Energy flow through ecosystems

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    2. Energy flow through ecosystems Photo credit: © Shutterstock 2009, Elisei ShaferPhoto credit: © Shutterstock 2009, Elisei Shafer

    3. Obtaining energy

    4. Energy availability in photoautotrophs Teacher notes Most of the sun’s energy that reaches the earth’s atmosphere is reflected back into space by clouds and dust or absorbed by the atmosphere. All figures are approximate generalisations and will vary depending on species and abiotic factors. See the ‘Photosynthesis: The Reaction’ presentation for more information the absorption spectra for chlorophyll. Teacher notes Most of the sun’s energy that reaches the earth’s atmosphere is reflected back into space by clouds and dust or absorbed by the atmosphere. All figures are approximate generalisations and will vary depending on species and abiotic factors. See the ‘Photosynthesis: The Reaction’ presentation for more information the absorption spectra for chlorophyll.

    5. Primary production

    6. Ecosystem examples Photo credit (desert): Jupiterimages corporation Photo credit (rainforest): © Shutterstock 2009, Andre Nantel Teacher notes Students could be ask to think about why the ecosystems differ in their net primary productivity.Photo credit (desert): Jupiterimages corporation Photo credit (rainforest): © Shutterstock 2009, Andre Nantel Teacher notes Students could be ask to think about why the ecosystems differ in their net primary productivity.

    7. Ordering NPP of ecosystems

    8. Routes of energy transfer Photo credit: © Shutterstock 2009, WizData, inc. Photo credit: © Shutterstock 2009, WizData, inc.

    9. What is trophic efficiency?

    10. Loss of energy between trophic levels? Photo credit: © Shutterstock 2009, dean bertoncelj Teacher notes Students could be reminded that it is due to this loss of energy between trophic levels that food chains are naturally restricted to a maximum of five trophic levels.Photo credit: © Shutterstock 2009, dean bertoncelj Teacher notes Students could be reminded that it is due to this loss of energy between trophic levels that food chains are naturally restricted to a maximum of five trophic levels.

    11. Comparing trophic efficiencies Photo credit (elephant): © Shutterstock 2009, Johan Swanepoel Photo credit (zooplankton): Spike Walker, Wellcome Images Photo credit (elephant): © Shutterstock 2009, Johan Swanepoel Photo credit (zooplankton): Spike Walker, Wellcome Images

    12. Efficiency of transfers in a food chain

    13. Energy transfer: true or false?

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