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Homework – Share out

When we try to pick out anything by itself, we find it hitched to everything else in the universe. John Muir . Homework – Share out. 1 – 2 minutes per team member 1. Identify the situation 2. Describe the graph 3. Explain your conclusion. Biomagnification. www.lab-initio.com. Fig. 11-4

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Homework – Share out

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  1. When we try to pick out anything by itself, we find it hitched to everything else in the universe. John Muir

  2. Homework – Share out 1 – 2 minutes per team member 1. Identify the situation 2. Describe the graph 3. Explain your conclusion

  3. Biomagnification

  4. www.lab-initio.com

  5. Fig. 11-4 p. 231 DDT and Bioaccumulation(absorbed or stored in organs) and Biomagnification(through a food chain)

  6. Biomagnification • Definition: • Biomagnification, is the increase in concentration of a substance, such as the pesticide DDT, that occurs in a food chain

  7. The Problem: Peregrine Falcons Extirpated from much of U.S. http://www.iowaccess.org/main/news/newsimages/peregrine.jpg

  8. Osprey andBald Eagles were declining,as well. http://www.state.tn.us/twra/graphics/BLDEAGLE.jpg http://www.state.tn.us/twra/graphics/OSPREY.jpg

  9. Meanwhile, in Borneo: • Roofs began to fall • Gecko-eating cats began to die, • and thriving rats brought plague and typhus • The World Health Organization began to parachute cats into Borneo, but what was causing these problems? http://www.herpafauna.com/pics/geckos/a-felinus.jpg

  10. The problem magnifies: • MethylMercuryconcentrates just like DDT and damages human Nervous Systems • A person who eats one meal of lake trout from Lake Michigan will be exposed to more PCBs in one meal than in a lifetime of drinking water from the lake!

  11. Mercury Health Effects

  12. Case Study: PCBs PCBs, or polychlorinated biphenyls, are a group of man-made chemicals. Introduced in 1929 and widely used in electrical transformers, cosmetics, varnishes, inks, carbonless copy paper, pesticides and for general weatherproofing and fire-resistant coatings to wood and plastic. The federal government banned the production of PCBs in 1976 PCBs can effect the immune system, fertility, child development and possibly increase the risk of certain cancers

  13. PCBs (polychlorinated biphenyls) PAHs (polynuclear aromatic hydrocarbons) Heavy metals: mercury copper cadmium chromium lead nickel zinc tin TBT (tributyltin) mercury from gold mining cyanide selenium The number of new molecules we introduce into our environment continues to increase. The Problem is ongoing:

  14. The Ultimate Solution? • Models are being developed to predict toxicity of new chemicals • Pollution control must be intensified: Zero Tolerance in the Great Lakes? • Education: Increase awareness so everyone will decrease use and dispose of chemicals properly.

  15. Biomagnification Through the Food Chain

  16. Horton, in Dr. Seuss’s Horton Hears a Who • “We’ve GOT to make noise in greater amounts! So, open your mouth, lad! For every voice counts!”

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