Breeding success and organo-chlorine residues in golden eagles in west Scotland.

Published online
22 May 1970
Content type
Journal article
Journal title
Journal of Applied Ecology

Lockie, J. D. & Ratcliffe, D. A. & Balharry, R.

Publication language
UK & Eastern Scotland & Scotland & West Scotland


Dieldrin was banned from use in sheep dips in January 1966. The proportion of golden eagle eyries in western Scotland that produced young increased from 31% in the period 1963-65 to 69% in the period 1966-68. Concurrently, the dieldrin level in eagles' eggs fell from 0.86 ppm to 0.34 ppm, respectively. Eagles in eastern Scotland, where dieldrin levels in eggs are very low, consistently maintained a high breeding success rate between 1963 and 1968. No environmental changes are correlated with the improved breeding success rate in western Scotland.

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