註釋 Liver and blubber samples from 50 juvenile male northern fur seals (Callorhinus ursinus) were collected on St. Paul Island from four different seal rookeries between 1987 and 2007. Samples were analyzed for vitamins and for both legacy and current-use persistent organic pollutants (POPs). The resultant data set provides information on how concentrations of the two groups of POPs are changing with time in the northern fur seal population. Legacy POPs determined included polychlorinated biphenyl congeners (PCBs), dichlorodiphenyltrichloroethane (DDT) and metabolites, chlorobenzenes, toxaphene, chlordane-related compounds, and mirex. With the exception of mirex, all legacy compounds showed statistically significant declines with sampling year consistent with trends observed in marine mammals from other northern areas such as the Canadian Arctic. Overall, concentrations of legacy POPs are similar to levels seen in seal samples from other areas of the North Pacific Ocean and the Bering Sea and are considerably lower (factor of 10 or greater) than observed in marine mammals from temperate regions of the United States. 