|Document Type:||Journal Article|
|Title:||Time trends of persistent organic pollutants in benthic and pelagic indicator fishes from Puget Sound, Washington, USA|
|Author:||James E. West, Sandra M. O'Neill, Gina M. Ylitalo|
|Journal:||Archives of Environmental Contamination and Toxicology|
|Keywords:||Pacific herring,english sole,Persistent Organic Pollutants,"Puget Sound, WA"|
We modeled temporal trends in polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), and dichlorodiphenyltrichloroethane and its metabolites (DDTs) in two indicator fish species representing benthic and pelagic habitats in Puget Sound, Washington, USA. English sole (benthic) index sites and larger-scale herring (pelagic) foraging areas represented a wide range of possible contamination conditions, with sampling locations situated adjacent to watersheds exhibiting high, medium and low development. Consistency in analytical data throughout the study was maintained by either calculating method-bias-correction factors on paired samples as methods evolved, or by analyzing older archived samples by current methods. PCBs declined moderately in two herring stocks from a low-development basin (2.3% and 4.0% annual rate of decline), and showed no change in the highly developed and moderately developed basins over a 16-year period. PCBs increased in English sole from four of ten sites (2.9% to 7.1%), and the remaining six exhibited no significant change. PBDEs and DDTs declined significantly in all herring stocks (4.2% to 8.1%), although analytical challenges warrant caution in interpreting DDT results. PBDEs declined in English sole from two high-development and one low-development site (3.7% to 7.2%), and remained unchanged in the remaining seven. DDTs increased in English sole from one high development site (Tacoma City Waterway) and declined in two high-development and one low-development site. As with herring, analytical challenges warrant caution in interpreting the English sole DDT results. It is likely that source controls and mitigation efforts have contributed to the declines in PBDEs and DDTs overall, whereas PCBs appear to have persisted, especially in the pelagic food web, despite bans in PCB production and use.
|Theme:||Habitats to Support Sustainable Fisheries and Recovered Populations|
Assess the impacts of toxic chemicals and other pollutants across biological scales, and identify pollution reduction strategies that improve habitat quality.