Abstract
Adult herring gulls, Larus argentatus, were captured on their nests at various colonies on the Great Lakes and retinoids (vitamin A) analyzed in the liver by reverse-phase HPLC. All- trans-retinol and all- trans-retinyl palmitate concentrations showed significant differences between colonies. Colonies having the highest concentrations of 2,3,7,8-tetrachlorodibenzo- p-dioxin had the lowest retinoid concentrations. Particularly low levels of hepatic retinoids occurred in Lake Ontario gulls in 1987; and all- trans-retinol was negatively correlated with liver aryl hydrocarbon hydroxylase activity. Liver retinoids were identified in the white sucker, Catostomus commersoni, using reverse-phase HPLC with diode array detection. All- trans-retinol, all- trans-retinyl palmitate, and 3,4-didehydroretinyl esters were detected. In the case of adult white suckers sampled from a contaminated river near Montreal and a control site, significantly lower levels of all- trans-retinol and all- trans-retinyl palmitate were found in the contaminated population.
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