Abstract
of environmental pollutants on passerine birds (George and Mitchell 1947; Dittrich 1966; Mehrotra et al. 1967; Hill 1971, 1972; Jefferies 1971; Pope and Ward 1972). However, the validity of extrapolating results from studies of confined animals to naturally occurring populations has not been confirmed by simultaneous comparisons of the responses of captive and free-living individuals. Our objective was to conduct such a comparison for 2 physiological responses, brain cholinesterase activity and body weight, in captive and free-living starlings (Sturnus vulgaris) exposed to the organophosphate pesticide dicrotophos (3-hydroxy-N,N-dimethyl-cis-crotonamide dimethyl phosphate, purity = 85%). Organophosphate (OP) pesticides act by inhibiting cholinesterase (ChE) activity that causes accumulation of acetylcholine at nerve endings and consequent disruption of nerve function (O'Brien 1967:55).
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