Hydrocarbons, CYP, Histrionicus histrionicus, Enhydra lutris, Congeners, Petroleum - adverse effects, Blood Chemical Analysis, Polychlorinated Biphenyls - blood, Chromatography, Gas, Environmental Exposure, Environmental Pollutants - blood, Ducks - blood, Otters - blood, Animals, Analysis of Variance, Alaska, Environmental Monitoring - statistics & numerical...