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Warm up

Warm up. Define: B iomass Tropic level What % of energy is passed on to the next level ?. Warm up. Define biomass, trophic levels…what % Biomass : the total organic matter in an ecosystem Trophic Levels: Functional Role in a feeding relationship through which energy flows

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Warm up

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  1. Warm up • Define: • Biomass • Tropic level • What % of energy is passed on to the next level?

  2. Warm up • Define biomass, trophic levels…what % • Biomass: the total organic matter in an ecosystem • Trophic Levels: Functional Role in a feeding relationship through which energy flows • 10% of energy of one kilogram of energy is passed to the next level

  3. Reminder- Test Tomorrow • PRACTICE QUESTION: Construct a food web on the students observations Label the producers, level of consumers, and decomposers (bacteria) Read below and see what some students saw: • Herbivorous insects were found only on the grass meadow • Spiders, birds, and toads were harder to find after a snakes came to the meadow • Birds sat in the grass where the insects were present • Some spiders were seen eating the insect eggs in the grass

  4. Objective • Students will demonstrate knowledge of trophic levels as evidenced by creating a model of mono lake trophic variation

  5. Review that food/ sun gives energy

  6. Question: Is all the energy from one organism consumed by the creature that eats it? • Use page 20 in the FOSS ecology textbook to find the answer to this

  7. Only 10% gets passed on to the next organism • Solve this: A brine shrimp eats 10 grams of algae in its life before the gull eats it…does the gull get 10 grams of food energy from the brine shrimp?

  8. Biomass Models • Each bead represents 1 kg of biomass in Mono Lake. (One bead is not one organism.) • Different colors represent different organisms. • We can use these beads to make a physical representation of the tropic levels in Mono Lake.

  9. What Color? • Dark Green: Benthic algae • Light Green: Planktonic algae • Red: Brine shrimp • Black: Brine flies • Gray: California gulls

  10. The Challenge • Construct 1 kg of gull biomass.

  11. Wrap Up: • Does a healthy ecosystem produce the same amount of biomass at each level? • If the amount of biomass varies, which trophic level has the most biomass? Why?

  12. Wrap Up Answers: • Does a healthy ecosystem produce the same amount of biomass at each level? • No • If the amount of biomass varies, which trophic level has the most biomass? Why? • The greatest biomass has to be in the producers. • They are the foundation of the food web. The more producers, the more primary consumers, etc.

  13. Wrap Up: • If brine shrimp eat 10 kg of algae to produce 1 kg of brine shrimp biomass, where does the other 9 kg of biomass go? • What happens to an ecosystem if one population fails?

  14. Wrap Up: • If brine shrimp eat 10 kg of algae to produce 1 kg of brine shrimp biomass, where does the other 9 kg of biomass go? • Biomass is consumed for energy to run the processes of life. 90% is converted into energy, simple chemicals (carbon dioxide and water) and waste. • What happens to an ecosystem if one population fails? • Populations at trophic levels higher than the failure might experience stress or failure due to lack of food. • Populations at lower trophic levels might thrive if there are less predators.

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