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- W4323364775 abstract "Abstract Organochlorine contaminants (OCs) accumulate in top predators, reaching high levels associated with negative physiological effects. Measuring OCs is key for assessing the accumulation of their loads and evaluating the efficiency of contaminant regulations. Some OCs generate specific signatures in certain areas, which allow us to track potential movements and feeding habits of species. Thirty‐five blubber biopsies were taken from northern elephant seals (NES) during fall at Guadalupe Island (GI), Mexico, an important site for hauling‐out, molting, and breeding. Biopsies were analyzed for dichlorodiphenyltrichloroethane and its metabolites (tDDTs), hexachlorobenzene, chlordanes, and total PCB congeners (tPCBs). tDDTs were higher in adults than in juveniles, suggesting age class‐based bioaccumulation, related to time and differences in foraging and habitat use between age groups. Females had higher variability of OCs than males, attributed to multiple causes, including variation in the use of foraging grounds and niche segregation. The DDT:PCB ratios were the highest, showing similarity with the Palos Verdes (California) contaminant signature, suggesting the use of similar feeding areas in relation to juvenile NES from Southern California. Our baseline of OC levels for NES at GI, allows future monitoring of changes in legacy contaminants over time, and the evaluation of the efficiency of their regulations." @default.
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- W4323364775 date "2023-03-06" @default.
- W4323364775 modified "2023-10-14" @default.
- W4323364775 title "Use of <scp>DDTs</scp> and <scp>PCBs</scp> as chemical tracers in assessing the foraging locations and habits of northern elephant seals from Guadalupe Island (Mexico)" @default.
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- W4323364775 doi "https://doi.org/10.1111/mms.13004" @default.
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