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Chlorinated Hydrocarbons and Eggshell Changes in Raptorial and Fish-Eating Birds
Joseph J. Hickey and Daniel W. Anderson
New Series, Vol. 162, No. 3850 (Oct. 11, 1968), pp. 271-273
Published by: American Association for the Advancement of Science
Stable URL: http://www.jstor.org/stable/1725067
Page Count: 3
You can always find the topics here!Topics: Eggshells, Eggs, Birds of prey, Chlorinated hydrocarbons, Egg shell thickness, Population dynamics, United States history, Population decline, Birds, Insecticides
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Catastrophic declines of three raptorial species in the United States have been accompanied by decreases in eggshell thickness that began in 1947, have amounted to 19 percent or more, and were identical to phenomena reported in Britain. In 1967, shell thickness in herring gull eggs from five states decreased with increases in chlorinated hydrocarbon residues.
Science © 1968 American Association for the Advancement of Science