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Ecosystem Dynamics Lesson - Understanding Autotrophs, Heterotrophs, and Food Webs

Learn about autotrophs, heterotrophs, food chains, and energy flow in ecosystems. Engage in activities to understand ecological pyramids and trophic levels. Homework assignments and interactive learning goals included.

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Ecosystem Dynamics Lesson - Understanding Autotrophs, Heterotrophs, and Food Webs

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  1. Unit 7, Day 3

  2. Homework Quiz (6) • Open Note (stamp) • Autotrophs (all types) • Heterotrophs (all types) • Food Chains • Food Webs • Producers and Consumers (all trophic levels) • Energy, Biomass, and Numbers Pyramids

  3. Agenda (1) • Homework Quiz • Agenda • Homework Debrief • Learning Goal • String Activity • Activity Analysis • Pyramid Activity • Island Application (Research) • Homework

  4. Homework Debrief (6) • Autotrophs (all types) • Heterotrophs (all types) • Food Chains • Food Webs • Producers and Consumers (all trophic levels) • Energy, Biomass, and Numbers Pyramids

  5. Learning Goal (1) • Objective 2.5.F (Energy Models) – I can describe how energy flows through an ecosystem and I can model this with food chains, food webs, and ecological pyramids.

  6. String Activity (15) • If possible, find the person with the same word • Together, hypothesize if/who you consume AND if/who consumes you • There may be multiple answers! • Approach those other organisms. IFF they agree with your hypothesis, then place a string between you. • Try to keep string untangled • Please do not push through strings

  7. Activity Analysis (10) • Based on what we as a class determined, work with your table to draw a food web. • Determine what each organism is: primary producer, primary consumer, secondary consumer, tertiary consumer, detritivore, or decomposer • It’s okay for you to be incorrect! Take a risk. • Alligator Lizard, Bacteria, Cricket, Dead Animals, Dead Leaves, Earthworm, Fox, Fungus, Hawk, Maggots,Maple Tree Leaves, Millipede, Mushrooms, Pillbugs, Robin, Rotting Log, Sun

  8. Activity Debrief (3)

  9. Notes (4) • Detritivores CONSUME detritus • Detritus = dead plants/animals, feces • Millipedes, woodlice, dung flies, slugs, worms, sea stars, sea cucumbers, fiddler crabs • Decomposers CAN’T EAT. They ABSORB & BREAK DOWN cells. • Bacteria (dec. meat), fungi (dec. fruits/veggies)

  10. Pyramid Activity (4) • On panel 1: • Ecological Pyramids • Graphs of trophic structure • Trophic levels (feeding position) • Primary producer = autotroph • Primary consumer = herbivore • Secondary/Tertiary consumer = omnivore/carnivore

  11. Pyramid Activity (8) • Panel 2 • Pyramid of Energy • Flow of energy • Lose 90% of energy as heat • Only 10% of energy available for next trophic level • Base has 100% of energy available

  12. Pyramid Activity (8) • Panel 3 • Pyramid of Biomass • Biomass per area • Biomass = mass of each individual x number of individuals at each trophic level • g/m2

  13. Pyramid Activity (8) • Panel 4 • Pyramid of Numbers • # of individuals per area • Large # of producers at base • Lower # of carnivores at top • (Usually)

  14. Island Application (22 + 3 cleanup) • Must have primary producers, primary consumers, secondary consumers, tertiary consumers, and decomposers. • Must contain autotrophs, herbivores, omnivores, carnivores, and detritivores. • Create a food web that contains at least 3 organisms at each trophic level + decomposers + detritivores • Humans do not count!

  15. Homework (1 min) • Due Wed 4/17 or Thu 4/18 • YouTube Video: Biogeochemical Cycles • Homework Quiz: Biogeochemical Cycles • Homework quiz is open note • Suggestion: Draw each cycle!!!

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