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Energy conversions:

Dive into the intricate world of energy conversions in ecosystems, understanding the efficiency and productivity of photosynthesis, measuring gross and net primary productivity, and exploring the flow of energy among trophic levels. Discover the role of producers and consumers, and how ecological pyramids illustrate energy transfer. Uncover the 10% Rule and trophic efficiency, shedding light on the fascinating dynamics of the energy cycle.

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Energy conversions:

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  1. Energy conversions: Driving the system…

  2. From last lesson…

  3. Continuous process = cycle

  4. The Energy cycle?

  5. The Producers: p. 345 Photosynthetic efficiency

  6. http://wps.pearsoned.com.au/sd3/46/11967/3063571.cw/content/index.htmlhttp://wps.pearsoned.com.au/sd3/46/11967/3063571.cw/content/index.html

  7. Efficiency and productivity • Environmental factors influence photosynthetic efficiency • Productivity can differ between seasons, ecosystems – p.346 • We like to measure these things – how?

  8. Gross Primary Productivity (GPP) Net Primary Productivity (NPP) Like salary after tax… NPP = GPP – energy used for respiration Can be measured by mass (g/m2/year) or energy (kJ/m2/year We’ll take this idea further when we talk about trophic efficiency. • = total organic matter in an ecosystem made during photosynthesis • BUT not all of this is available to consumers – producers need some of it too! • SO we measure…

  9. The consumers: p. 350 • Primary consumers • Secondary consumers • Top consumers • Omnivores • Scavengers • Detrivores (aka detritivores) • Decomposers

  10. Where does the energy go?

  11. Recap Mindmap eg. Efficiency vs. production GPP NPP

  12. Next time: • More on trophic levels and trophic efficiency • Read: pp.344-353 • Look at questions on p.348 and 354

  13. Energy flow revisited

  14. Trophic efficiency • Photosynthetic efficiency = the percentage of light energy that a producer converts to chemical energy (carbohydrates) during photosynthesis • Trophic efficiency = the percentage of chemical energy that is transferred from one trophic level to the next

  15. Trophic efficiency The 10% Rule: • Approximately 90% of energy is lost as we move up each trophic level!

  16. Ecological pyramids

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