Endangered Species Handbook

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Aquatic Ecosystems

Toxic Chemicals

     Some chemicals, such as Polychlorinated Biphenyls (PCBs) and pesticides, have entered aquatic systems, causing birth defects in water birds and other wildlife.  PCBs, manufactured by General Electric, were used for decades in refrigerators and other industrial uses until it was discovered that when released to the environment, they had serious effects on wildlife.  American bald eagles have been among the species affected by PCBs, producing chicks with crossed bills and other defects.

Page 1 (PCBs)
Page 2 (DDT)
Page 3 (Mercury)
Page 4 (Chemical Runoff)
Page 5 (Sewage)
Page 6 (Lead)
Page 7 (Human Population)
Page 8 (Acids)
Page 9 (Dioxides)
Page 10 (United States)
Page 11 (Asia & South America)

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