0
3-3 Energy in Ecosystems
Concept to UnderstandAs energy flows throughecosystems in food chains andwebs, the amount of chemicalenergy available to ...
Fig. 3-8, p. 46Trophic LevelsAt each level energy is transferred to thenext but some energy is “lost” in the formof heat
Energy Flow in EcosystemsFood chainSequence of organisms, eachof which serves as a source offood for the nextFood webN...
Usable Energy by Trophic LevelEnergy flow follows the second law ofthermodynamics, which is……2nd Law of Thermodynamics: ...
Usable Energy by Trophic LevelBiomass – dry weight of all organicmatter in plants and animals in anecosystem.Biomassdecr...
Fig. 3-10, p. 47Ecological efficiency – typically 10%(10% rule)
Two Kinds of Primary ProductivityGross primary productivity (GPP) – The rate at whichecosystems producers convert solar e...
Two Kinds of Primary ProductivityNet primary productivity (NPP) – is what energy is left overfor the consumers in the eco...
Two Kinds of Primary ProductivityPlanet’s NPP limits number of consumersHumans use, waste, or destroy 10-55% of earth’s ...
Temperate forestAquatic EcosystemsOpen oceanContinental shelfLakes and streamsEstuariesTerrestrial EcosystemsExtreme deser...
3 3 energy in ecosystems
3 3 energy in ecosystems
Upcoming SlideShare
Loading in...5
×

3 3 energy in ecosystems

2,582

Published on

Published in: Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
2,582
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
7
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Transcript of "3 3 energy in ecosystems"

  1. 1. 3-3 Energy in Ecosystems
  2. 2. Concept to UnderstandAs energy flows throughecosystems in food chains andwebs, the amount of chemicalenergy available to organisms ateach succeeding feeding leveldecreases.
  3. 3. Fig. 3-8, p. 46Trophic LevelsAt each level energy is transferred to thenext but some energy is “lost” in the formof heat
  4. 4. Energy Flow in EcosystemsFood chainSequence of organisms, eachof which serves as a source offood for the nextFood webNetwork ofinterconnected foodchainsMore complex than a foodchain
  5. 5. Usable Energy by Trophic LevelEnergy flow follows the second law ofthermodynamics, which is……2nd Law of Thermodynamics: Energycannot be created or destroyed, butchanged.But as energy is changed, someenergy is lost in the form of heat.
  6. 6. Usable Energy by Trophic LevelBiomass – dry weight of all organicmatter in plants and animals in anecosystem.Biomassdecreases withincreasingtrophic level
  7. 7. Fig. 3-10, p. 47Ecological efficiency – typically 10%(10% rule)
  8. 8. Two Kinds of Primary ProductivityGross primary productivity (GPP) – The rate at whichecosystems producers convert solar energy into chemicalenergy in the form of biomassSo the amount ofsolar energyconverted intocellskilocalories/squaremeter/year
  9. 9. Two Kinds of Primary ProductivityNet primary productivity (NPP) – is what energy is left overfor the consumers in the ecosystem.GPP minus the energy the producer need to survive
  10. 10. Two Kinds of Primary ProductivityPlanet’s NPP limits number of consumersHumans use, waste, or destroy 10-55% of earth’s totalpotential NPPHuman population is less than 1% of total biomass ofearth’s consumers
  11. 11. Temperate forestAquatic EcosystemsOpen oceanContinental shelfLakes and streamsEstuariesTerrestrial EcosystemsExtreme desertDesert scrubTundra (arctic and alpine)Temperate grasslandWoodland and shrublandAgricultural landSavannaNorthern coniferousforest (taiga)Swamps and marshesTropical rain forestFig. 3-11, p. 48Average net primary productivity (kcal/m2/yr)800 1,600 2,400 3,200 4,000 4,800 5,600 6,400 7,200 8,000 8,800 9,600
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×