Studies of Recent Changes in the Status of Some Birds of Prey and Fish- Feeding Birds in Britain

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Abstract
Studies of possible effects of pesticides on populations of wild vertebrates in Britain have principally been confined to the birds of prey, the Heron and the Great Crested Grebe. These were selected after analyses showed they contained higher residues of certain persistent organochlorine pesticides than omnivorous or herbivorous species. The work includes chemical analyses of the birds and their eggs, national surveys of breeding distribution and studies of breeding success in the wild. Species thought to have been adversely affected are being compared with closely allied species showing no significant population changes. Analyses of birds or eggs have been completed for sixteen of the seventeen regular British breeding birds of prey and for the Heron and the Great Crested Grebe; national surveys have been made of eight birds of prey and of the Heron (a survey of the Great Crested Grebe is being carried out this year); breeding studies are in progress for the Peregrine, Golden Eagle, Sparrow-Hawk and Heron.

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