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SC 300 Unit 4. Welcome to Unit 4. Comments and questions? This week in Unit 4 Seminar topic – food chains and food webs Coming up in unit 5. Any questions?. This week in Unit 4. Reading – Chapter 3, 17 Web resource – energy and photosynthesis

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Presentation Transcript
welcome to unit 4
Welcome to Unit 4

Comments and questions?

This week in Unit 4

Seminar topic – food chains and food webs

Coming up in unit 5

this week in unit 4
This week in Unit 4

Reading – Chapter 3, 17

Web resource – energy and photosynthesis

Discussion – Powering Kaplanville with energy

Seminar – food chains/webs

Project – Energy and earthquakes

slide6

Plankton to fish – up the food web

http://marineodyssey.co.uk/resources/_wsb_800x570_Marine+Food+Web.png

grazing food chain based on photosyntesis
Grazing food chain (based on photosyntesis)

Heterotrophs

Zooplankton Nekton

(level 4-5)

Trophic levels 2-3

(herbivores and small carnivores)

Autotrophs

Phytoplankton

Trophic level 1

(primary producers)

slide10

Photosynthesis and eating are complimentary!Primary production (photosynthesis) by plants (autotrophic):6CO2 + 6H20 + solar energy = C6H12O6 + 6O2

pyramid of energy
Pyramid of Energy
  • Illustrates how much energy is present at each trophic level and how much is transferred to the next level
    • Most energy dissipates between trophic levels
  • Explains why there are so few trophic levels
food web and energy transfer
Food web and energy transfer

-the biomass at lower trophic levels provides food for higher trophic levels

-generally, animals are smaller and reproduce faster at lower trophic levels. In addition, the organisms are more numerous at lower levels

-the base of the energy pyramid for marine food webs is chemical or solar energy. The transfer of energy from one trophic level to the one above is only about 10%. So there is a decrease in biomass and number of organisms at higher trophic levels

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