1 / 15

Trophic Levels Trophic Efficiency Bioaccumulation

Trophic Levels Trophic Efficiency Bioaccumulation. Seatwork. Read pages 24-26 and then answer the following questions. LEAVE SPACE after each answer. Define trophic level and give several examples. Define biomass. Define trophic efficiency Define bioaccumulation. Define biomagnification.

milo
Télécharger la présentation

Trophic Levels Trophic Efficiency Bioaccumulation

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. Trophic LevelsTrophic EfficiencyBioaccumulation

  2. Seatwork Read pages 24-26 and then answer the following questions. LEAVE SPACE after each answer. Define trophic level and give several examples. Define biomass. Define trophic efficiency Define bioaccumulation. Define biomagnification.

  3. Trophic Levels • A trophic level is a category of organisms that is defined by how the organisms gain their energy. Examples: • First trophic level = primary producers • Second trophic level = primary consumers (herbivores) • Third trophic level = secondary consumers

  4. Biomass • Biomass is the total mass of living organisms in a defined group or area. • It includes living cells and tissues that have been assembled by organisms using solar energy. • Plant material is packed with chemical energy that has been converted from solar energy. • Animals indirectly rely on solar energy by eating plants or animals.

  5. Trophic Efficiency • Trophic efficiency is a measure of the amount of energy or biomass transferred from one trophic level to the next higher trophic level. • Trophic efficiencies are quite inefficient – only about 10%. • Organisms use much of the energy from the biomass they consume for life functions and wastes they produce

  6. Reasons for Biomass Decreases Between Trophic Levels • Herbivores don’t eat all of the plant • Not everything that is eaten is digested

  7. Reasons for Energy Decrease between Trophic Levels: • Energy is lost as heat by organisms • Energy is used for life processes

  8. Relative Numbers at Trophic Levels • Because of the inefficiencies of energy transfer among trophic levels, there are usually fewer carnivores than herbivores and fewer herbivores than plants

  9. Water Pollution and Bioaccumulation • Bioaccumulation is a process in which materials, especially toxins, are ingested by an organism at a rate greater than they are eliminated. • Biomagnification is the increase in concentration of a toxin as it moves from one trophic level to the next.

  10. Seatwork • Read pages 25-27 and then answer the following questions: • Explain how the use of DDT and PCB’s are example of bioaccumulation and biomagnification. • Review Questions 5 to 8 on page 27

More Related