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number of active nests has declined somewhat in recent years and the number of young hatched remains very low. In early surveys nearly all nests produced two or more young but in the past decade only about one out of 10 nests produces any young and then rarely more than 1 pa* nest. The number of active nests located has declined from more than 40 three years ago to the present level in spite of a greatly stepped-up survey effort.
In most of the nests found, the eggs fail to hatch and are abandoned some time after the normal incubation period has elapsed. When these eggs are examined they have thin shells which either break or fail to protect the developing embryo. It is generally accepted that high concentrations of pesticides such as DDT in adult birds cause their eggs to develop inadequate shells. Eagles and other birds such as ospreys and pelicans with predominately fish diets have proven most susceptible to this malady. The studies will continue but it is doubtful that much can be done with enough immediate effect to reverse the trend.
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Amissyille, Va. 937-4595
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