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Food Chains / Webs

Learn about food chains and webs, from producers that make their own food to consumers that eat other organisms. Discover the roles of decomposers and specific consumers, and explore the predator-prey and symbiotic relationships in nature.

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Food Chains / Webs

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  1. Food Chains / Webs

  2. What’s to Eat? • Producers: produce their own food • Plants that carry out photosynthesis • Trees, vines, shrubs, ferns, mosses,

  3. Producers

  4. Consumers • Organisms (animals) that obtain energy from eating other organisms • Must eat producers (plants) or other consumers (animals) • Squirrels, owls, deer, coyotes, humans

  5. Consumers

  6. Decomposers • Feed on the wastes of living organisms and on dead, decaying, plants and animals • Release nutrients from the animals waste and decaying matter and return the nutrients to the soil. • Fungi, bacteria, worms

  7. Decomposers

  8. Specific Consumers • Herbivores: plant eating – squirrel, deer, mice, rabbits • Carnivore: meat eating – wolves, tigers, • Omnivore: plant and meat eating – many birds, humans, box turtle,

  9. Predator – Prey Relationship • Predator: hunts other animals for food • Prey: hunted and eaten by other animals • Predator and prey population increase and decrease according to hunting • Lynx / Hare Population

  10. Hare and Lynx Relationship

  11. Close Relationships • Symbiosis: long term close relationship between • plants and microscopic organisms • Animals and plants • Animals and other animals

  12. Parasitism: one organism lives in or on, feeds upon, and harms another organism • Fleas, ticks, leeches

  13. Commensalism: one species benefits, while the other specie seems unaffected • Example: crab spider and flower

  14. Mutualism: all species benefit from the relationship • Example: bees & flowers

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