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DDT Residues in the Eggs of the Osprey in the North-Eastern United States and Their Relation to Nesting Success

Peter L. Ames
Journal of Applied Ecology
Vol. 3, Supplement: Pesticides in the Environment and Their Effects on Wildlife. (Jun., 1966), pp. 87-97
DOI: 10.2307/2401447
Stable URL: http://www.jstor.org/stable/2401447
Page Count: 11
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DDT Residues in the Eggs of the Osprey in the North-Eastern United States and Their Relation to Nesting Success
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Abstract

The Osprey (Pandion haliaetus) population in coastal Cormecticut has been declining for 9 years by 30 % annually, due to embryonic death before hatching (0.40-0.54 eggs hatch per nest). Hatchability and egg pesticide values were compared with those of an apparently stable colony in Chesapeake Bay, Maryland (1.3-1.6 eggs hatch per nest). Osprey populations in Maine, Massachusetts, Rhode Island and New York are also declining. DDT residues found were 350 μ g per egg (5.1 μ g/ml) in Connecticut, 205 μ g per egg (3-0 μ g/ml) in Maryland. Total DDT residues in fish from Connecticut nests were 5-10 times higher than in Maryland. A laboratory study of Japanese Quail showed that 10 and 50 ppm DDE and DDT in the diet rapidly produced residues in the eggs. In the few analyses so far completed, 50 ppm DDE caused linear increase to 60 μ g/ml after 60 days. 50 ppm DDD caused a stable level of 3.5 μ g/ml in the eggs. These studies are continuing.

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