1 / 17

Ecosystems Food Webs Energy exchange

Ecosystems Food Webs Energy exchange. Questions. Which of the following would represent a good investigative experiment testing for affects of a drug on pregnancy? 1) A pregnant mouse given 1 ml of a drug and a non-pregnant mouse given 1 ml of a placebo.

Download Presentation

Ecosystems Food Webs Energy exchange

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Ecosystems Food WebsEnergy exchange

  2. Questions • Which of the following would represent a good investigative experiment testing for affects of a drug on pregnancy? • 1) A pregnant mouse given 1 ml of a drug and a non-pregnant mouse given 1 ml of a placebo. • 2) A pregnant mouse given 1 ml of a drug and a non-pregnant mouse given 1 ml of a drug. • 3) A pregnant mouse given 1 ml of a placebo and another pregnant mouse given 1 ml of a drug. • 4) A non- pregnant mouse given 1 ml of a drug and a non-pregnant mouse given 1 ml of a placebo.

  3. Ecosystems • On a blue index card: Write down a definition of an ecosystem. Time limit is 2 minute. • Pair-Share your definition and then on a green index card write a shared definition between you and your partner.

  4. Ecosystems • A community of organisms (i.e. plants and animals) living together with their environment (non-living aspects), functioning as a unit.

  5. Energy Flow, NutrientCycling, & Feeding Relationships • Nutrients (purple) neither enter nor leave cycle • Energy (yellow) is not recycled • Captured by producers • Transferred through consumers (red) • Each transfer loses energy (orange)

  6. Primary Productivity: Photosynthesis O2 releasedto air Energyfromsunlight • Life uses < 0.03% of the sun's incident energy • Most is lost as heat from respiration CO2 absorbedfrom air Sugarsynthesized Growth Photosynthesis H2O absorbedfrom soil Mineralsabsorbedfrom soil

  7. Colored index cards • Use a purple index card. It has been said that all flesh is grass. Explain in a couple of sentences why that statement could be true.

  8. Food Chains • (a) A simple terrestrial food chain. • (b) A simple marine food chain. • 10% law determinesthe population sizeof each trophic level • More organisms at lower trophic levels

  9. 4 3 4 3 2 2 2 1 2 2 3 1 2 3 3 2 4 3 2 A Food Web • Simple food web on a short-grass prairie • Numbers represent trophic levels 1=producer 2=primary consumer 3=secondary consumer 4=tertiary consumer

  10. Energy Transfer and Loss Heat SecondaryConsumer PrimaryConsumer Producer Heat DetritusFeeders Chemicals Heat

  11. Energy transfer • Only 10% of the total energy is used at each level • In other words if a producer has 100 calories of useable energy then an herbivore has only 10 calories of useable energy and a carnivore only has 1 calorie

  12. An Energy Pyramid for aPrairie Ecosystem: The 10% Law

  13. Food web exercise • Grab a name tag • Wait for instructions • Producers = candy • Dinoflagellates=tootsie rolls • Green algae=butter toffee • Diatoms=hard candy • Brown algae=butterscotches • Consumers • Primary=Turquoise • Secondary=dark green • Tertiary=Fluorescent green • Primary pickup as many candy as possible in 30 seconds • Secondary tag as many producers as possible • Tertiary tag as many secondary

  14. Food web exercise • Goal: ? • 10 % rule • Modify for fourth graders?

  15. Questions Which of the following statements best describes the movements of energy through an ecosystem? • 1. Energy flow through • 2. Energy cycles • 3. Energy increases • 4. Energy recycles

  16. Questions • The amount of life that can be supported by an ecosystem is determined by the • 1) Efficiency of the consumers • 2) Number of producers and their efficiency • 3) Number of heterotrophs and their efficiency • 4) Number of decomposers and their efficiency

  17. Questions • If a wolf eats a rodent that ate a smaller insect that ate a plant, the wolf would be a(n): • 1) primary consumers • 2) decomposers • 3) producers • 4) secondary consumers • 5) tertiary consumers

More Related