期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 55, 期 14, 页码 9968-9978出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c01526
关键词
persistent organic pollutants; polycyclic aromatic hydrocarbons; growth; Chinook salmon
资金
- Jim Myers
- NOAA Northwest Fisheries Science Center - NOAA's Office of Response and Restoration, Assessment and Restoration Division
The study revealed that higher concentrations of pollutants in Portland Harbor and surrounding areas affect the growth rate of Upper Willamette River Chinook salmon, which may limit the reproductive success of the threatened population. Future habitat remediation or restoration actions may benefit ongoing recovery efforts for this species.
The industrial waterway in Portland Harbor, Oregon, is a migration corridor for a distinct population segment of Chinook Salmon (Upper Willamette River) currently protected by the U.S. Endangered Species Act. Juveniles are exposed to a suite of contaminants during outmigration including polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and dichlorodiphenyltrichloroethanes. We collected natural origin subyearling Chinook salmon from sites in and around the industrial harbor to evaluate growth (otolith microstructural analysis ) in relation to measured chemical concentrations in tissue. A reduced growth rate was associated with higher tissue contaminant concentrations, particularly mixtures represented by PAHs and certain PCBs, which were elevated in juvenile Chinook collected throughout sites within Portland Harbor relative to those captured upstream. First-year growth is an established predictor of individual survival and eventual reproductive success in Chinook salmon. Therefore, our results indicate that legacy pollution may be limiting the population abundance of threatened Willamette River Chinook salmon, and future habitat remediation or restoration actions may benefit ongoing species recovery efforts.
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