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Ecology Publications & Forms |
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Ecology Publications & Forms |
| Title | Assessing Sources of Toxic Chemicals Impacting Juvenile Chinook Salmon: Snohomish River Watershed Source Assessment of PBDE Flame Retardants |
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Assessing Sources of Toxic Chemicals Impacting Juvenile Chinook Salmon: Snohomish River Watershed Source Assessment of PBDE Flame Retardants (Number of pages: 87) (Publication Size: 7190KB)
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| Author(s) | Gipe, A., and W. Hobbs | ||||
| Description | Chinook salmon play a vital role in the Puget Sound ecosystems as prey for endangered southern resident killer whales and are culturally and economically important to Tribes and residents of Washington State. Chinook populations are in decline in part due to burdens of toxics accumulated during their seaward migration from Puget Sound rivers. Studies within the Snohomish River watershed have identified polybrominated diphenyl ethers (PBDEs), a group of flame-retardant chemicals, in juvenile Chinook at levels which can cause sublethal impacts, reducing their survival. To determine the sources of these chemicals and how they make their way into juvenile Chinook, we performed a contaminant source assessment from 2019 to 2022 in the Snohomish, Skykomish, and Snoqualmie rivers. Passive samplers, sediments, biofilms, and invertebrate samples were collected from throughout the watershed during low and high flow river conditions. Sources of PBDEs associated with the discharge of treated wastewater were identified in the lower Snohomish mainstem and in the Skykomish River. PBDEs were shown to accumulate in sediments, biofilms, and aquatic insects (invertebrates) throughout the watershed. PBDE concentrations in aquatic insects, and stomach contents and whole-body tissues of juvenile Chinook suggest juveniles are being exposed to PBDEs through their diet in the Snohomish estuary. The results of this study support the need for ongoing efforts to reduce PBDE levels in wastewater paired with long term monitoring of PBDEs in invertebrates and juvenile Chinook in the lower Snohomish mainstem. |
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The mission of the Department of Ecology is to protect, preserve, and enhance Washington’s environment. To help us meet that goal, please consider the environment before you print or request a copy.
ADA Accessibility The Department of Ecology is committed to providing people with disabilities access to information and services by meeting or exceeding the requirements of the Americans with Disabilities Act (ADA), Section 504 and 508 of the Rehabilitation Act, and Washington State Policy #188. Visit Ecology’s website for more information. |
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| Contact | EAP Publications Coordinator at 564-669-3028 or EAPpubs@ecy.wa.gov | ||||
| Keywords | water sampling, biofilm, Snoqualmie, source assessment, sample collection, flame retardants, SPMD, Skykomish, polybrominated diphenyl ethers, suspended sediment, wastewater treatment plant, toxics, Snohomish, Puget Sound, PBDE, flame retardant, CSO, combined sewer overflow, suspended sediment monitoring, killer whale, Chinook | ||||
| WEB PAGE | Toxic chemicals in juvenile Chinook salmon - Washington State Department of Ecology | ||||
| WATERSHED | Water Resource Inventory Area 07 Snohomish | ||||
| DATA | Environmental Information Management (EIM) #WHOB010 |
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| RELATED PUBLICATIONS | Title:
Quality Assurance Project Plan: Assessing Sources of Toxic Chemicals Impacting Juvenile Chinook Salmon |
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