1 / 19

Items (plastic) removed from the gullet of a fledgling Laysan albatross

Today: Toxins in the Environment... W and F: Overpopulation (human). Movie tonight- 7pm in Welch 1.308. Items (plastic) removed from the gullet of a fledgling Laysan albatross http://gadgets.boingboing.net/2007/08/31/plastic-litters-our.html. Human impacts:

warias
Download Presentation

Items (plastic) removed from the gullet of a fledgling Laysan albatross

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. Today: Toxins in the Environment... W and F: Overpopulation (human) Movie tonight-7pm in Welch 1.308 Items (plastic) removed from the gullet of a fledgling Laysan albatross http://gadgets.boingboing.net/2007/08/31/plastic-litters-our.html

  2. Human impacts: Dead zone in Gulf of Mexico from Mississippi River http://blog.nola.com/times-picayune/2007/06/despite_promises_to_fix_it_the.html

  3. Published in 1962

  4. Resources move from producer to consumers,and so do toxins.

  5. Bald eagle populations decreased because of DDT and other toxins.

  6. The accumulation of toxins in the eagle causes “fragile egg syndrome”

  7. In the late 1700's there were an estimated 100,000 bald eagles in the continental U.S. By 1963 there were 417 nesting pairs.

  8. 1967-73 bald eagle listed as endangered 1972 DDT use banned in the U.S. 2007 bald eagle delisted http://www.fws.gov/midwest/eagle/population/chtofprs.html

  9. Even though the bald eagle is no longer listed as endangered, there are still problems...

  10. On Catalina Island, CA only about 18% of bald eagle eggs have hatched over the past 15 years, largely because of DDT contamination in the eggs. http://www.iws.org/bald_eagles/Incubation%20Facility.html

  11. Catalina Island egg hatching 2005- 3 of 9 fertile eggs 2006- 5 of 8 2007- 7 of 9 http://www.iws.org/bald_eagles/Incubation%20Facility.html

  12. Bald eagles in New York have been found with elevated mercury levels. http://www.nytimes.com/2008/11/25/science/25eagl.html

  13. We add thousands of chemicals to the environment each year...

  14. BPA is an estrogen mimic; it binds to estrogen receptors. BPA estrogen

  15. BPA • U.S. produces more than 2.3 billion pounds per year • Linked to health problems in animals and humans • Debate about amount that is safe and exposure

  16. BPA has been found in over 90% of urine samples in people around the world.

  17. What criteria should be used to determine the safety of a chemical? What should the balance be between convenience, economy, and safety? How should conflicting or controversial data be interpreted? Who should make these decisions?

  18. Today: Toxins in the Environment... W and F: Overpopulation (human) Movie tonight-7pm in Welch 1.308 Items (plastic) removed from the gullet of a fledgling Laysan albatross http://gadgets.boingboing.net/2007/08/31/plastic-litters-our.html

More Related