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Feeding Relationships

Feeding Relationships. Give Me Energy or Give Me Death!!! (not quite Patrick Henry). All organisms need energy to live. 3 Types of Organisms Producers Consumers Decomposers. Producers. Organisms that make their own food using energy from the sun (photosynthesis) or by other means.

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Feeding Relationships

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  1. Feeding Relationships

  2. Give Me Energy or Give Me Death!!!(not quite Patrick Henry) • All organisms need energy to live. • 3 Types of Organisms • Producers • Consumers • Decomposers

  3. Producers • Organisms that make their own food using energy from the sun (photosynthesis) or by other means. • Ex. Plants, algae, some bacteria

  4. Consumers • Any organism that gets its food by eating other organisms. • Types of Consumers • Herbivores • Plant eaters • Ex. Rabbit • Carnivores • Meat-eaters • Eat herbivores or other carnivores • Ex. Shark, wolves • Scavengers: eat dead things

  5. Consumers • Types of Consumers • Omnivores • Eat both producers and other consumers • Ex. Raccoon, bears, most people

  6. Decomposers • Organisms that feed on the remains or wastes of other organisms. • Recycle the nutrients back into the soil • Often left out of food chain • Ex. Bacteria and fungi

  7. Food Chain • Traces the path of energy as it moves from one organism to the next in an ecosystem. • Shows only 1 energy path in an ecosystem. Notice how all energy begins with the SUN Producer=Photosynthesis Consumers

  8. Food Chain Tertiary Consumer Producer Secondary Consumer Primary Consumer Decomposers

  9. Food Chain Terminology • Producer • Photosynthetic organism that gets energy from sun. • Primary Consumer (1°) • First to feed. • Herbivore • Most energy gets used, some gets lost as heat, and some gets passed onto the secondary consumer. • Secondary Consumer (2°) • Eats the primary consumer (herbivore) • Carnivore, omnivore, or scavenger

  10. Food Chain • Tertiary Consumer (3°) • Eats the 2° consumer • Decomposer • Eats the remains of the consumers. • Obtains the little energy that is left from the consumers.

  11. Food Web • A system of several overlapping food chains. • Provides a more complete picture of the flow of energy in an ecosystem. Third-level Consumers Bobcat Hawk Second-level Consumers Weasel First-level Consumers Desert Cottontail Woodrat Producers Prickly Pear Cactus Mesquite

  12. Energy Flow • As energy is passed from organism to organism it is used to carry out cell processes and some is lost to the environment as heat. • 10% Rule • Only about 10% of the energy present at one feeding level is passed to the next feeding level. • Energy Pyramid • Another way of showing the transfer of energy from one level to the next.

  13. Energy Pyramids Show • That the amount of available energy decreases down the food chain • It takes a large number of producers to support a small number of primary consumers • It takes a large number of primary consumers to support a small number of secondary consumers

  14. 10% Rule & Energy Loss

  15. Summary Questions • Name the three energy roles of organisms in an ecosystem. How does each type of organism obtain energy? • How does the amount of available energy change from one level of an energy pyramid to the next level up? • Name and define the four types of consumers. • What is the source of energy for most ecosystems? • Why are food webs a more realistic way of portraying ecosystems than food webs?

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