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Unit 1 Topic 4

Unit 1 Topic 4. How Organisms Interact. Organisms In Ecosystems. A rabbit is chased by a lynx These animals are interacting! What two types of organisms are there? Abiotic (Water, air, soil) Non-living organisms in an environment Biotic (Plants, animals, people)

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Unit 1 Topic 4

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  1. Unit 1 Topic 4 How Organisms Interact

  2. Organisms In Ecosystems • A rabbit is chased by a lynx • These animals are interacting! • What two types of organisms are there? • Abiotic (Water, air, soil) • Non-living organisms in an environment • Biotic (Plants, animals, people) • Living organisms in an environment

  3. Example…

  4. Roles In Ecosystems • We all have different roles in life … • Team member • Student • Brother • Daughter • Just like us … organisms play different roles as well • The roles they fill are called niches

  5. Determining A Niche • In order to determine niche you must examine … • Where “it” lives • What “it” eats • How “it” interacts

  6. Different Niches • Different niches …? • Producers (grass, plants…) • Make life possible for all other organisms • Consumers (fox, rabbit…) • Consume foods, including other consumers!

  7. Consumers Extended • Consumers are split into 3 different categories… • Herbivores • They eat plants and vegetation • Carnivores • They eat meat and other consumers • Omnivores • They eat both plants and animals

  8. Consumers Extended • We can even break them down further! • Predators • The animal doing hunting/eating • Prey • The animal being hunted/eaten

  9. Web of Clarity! Producers Consumers Herbivore Carnivore Omnivore Prey Predator

  10. Food Chains • When you eat something … you eat the energy is contained! • Example: I eat a steak (cow), that ate plants (grass) that used the sun (energy) • Where does energy go? • Let me explain with this …

  11. Energy Flow! The Diagram! 33% Respiration 4% Tissues 63% Gas / Urine Feces 100% Eaten Fart!

  12. Food Webs vs. Chains • How are they different? • Chain = energy flow • Web = all organisms involves and who effects who

  13. Pyramid of Numbers • Webs and Chains show energy transfer but NOT how many organisms are involved! • Enter “The Pyramid of Numbers”! Biomass! Total mass of all organisms in an ecosystem!

  14. The Clean-Up Crew • Why are there few dead bodies laying around the natural environment? • “Clean-Up Crews”!

  15. Decomposers • As materials break down, the stored nutrients are released back into the ecosystem • Other organisms eat them! • So who does this? • Scavengers • Decomposers

  16. Scavengers • Organisms that feed on dead or decaying plant and/or animal matter

  17. Decomposers • They do not eat dead material! • They grow on or in it absorbing nutrients into their own cells • What they do not eat just cycles back it into the ecosystem

  18. Examples … • Decomposers • Ever find moldy bread at your house?

  19. Fungus! • Another example is fungus! • Like the mushrooms you eat!

  20. Topic 4 – Complete!

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