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Energy Flow Through Ecosystems Chapter 5 section 1

Explore energy transfer in food webs, determine ultimate energy source, and study feeding relationships in ecosystems. Learn how energy diminishes through trophic levels and the impact of toxins in food chains. Discover the significance of biomass in driving ecosystems.

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Energy Flow Through Ecosystems Chapter 5 section 1

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  1. Energy Flow Through Ecosystems Chapter 5 section 1

  2. OBJECTIVES: OUR objectives: - Examine and characterize energy transfer in food webs and chains. - Determine the ULTIMATE source of energy. - Examine feeding relationships at work in ecosystems

  3. WHAT IS THE ULTIMATE SOURCE OF ENERGY FOR MOST FOOD WEBS AND CHAINS?

  4. Trophic Levels Food chain- simple model that shows how matter and energy move through an ecosystem Direct Feeding Relationship

  5. Trophic Levels Food web- shows all possible feeding relationships in a community at each trophic level Multiple Feeding relationships • Represents a network of interconnected food chains

  6. Food chain Food web (just 1 path of energy) (all possible energy paths)

  7. Trophic Levels • Each link in a food chain is known as a trophic level. • Trophic levels represent a feeding step in the transfer of energy and matter in an ecosystem.

  8. Trophic Levels Biomass- the amount of organic matter comprising a group of organisms in a habitat. • As you move up a food chain, both available energy and biomass decrease. • Energy is transferred upwards but is diminished with each transfer.

  9. Trophic Levels E N E R G Y Tertiary consumers- top carnivores Secondary consumers-small carnivores Primary consumers- Herbivores Producers- Autotrophs

  10. Energy pyramid • At each trophic level 90% of the energy is USEDand only the remaining 10% is passed….so if you eat an apple 90% of the potential energy that the apple possesses is your body using it. • If an alligator were to eat YOU he would only get 1% of the apples potential energy.

  11. THE POINT • ENERGY decreases as you move UP the food chain. • Video 1 • 2 • 3

  12. Gotcha! • Video • Umm…song • Video 2 • hoot

  13. Toxins in food chains- • While energy decreases as it moves up the food chain, toxins increase in potency. • This is called biological magnification Ex: DDT & Bald Eagles

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