A new report about toxics in the Salish Sea brings together findings from over 40 research programs and includes case studies of Chinook salmon, shellfish and killer whales, among other species:
The report from the Puget Sound Ecosystem Monitoring Program and co-edited by PSI’s Andy James highlights trends for toxics during 2016. While some of the news was positive, such as gradual declines in contaminants in sediments, much of the report shows severe and continuing impacts from a wide variety of harmful chemicals.
Already threatened species such as Chinook salmon may be especially vulnerable. According to the report, a third of juvenile Chinook migrating through Puget Sound pick up enough contaminants in their bodies to damage their health. Scientists say that could explain some of the higher than expected death rates among juvenile Chinook in Puget Sound, or could make them more vulnerable to predators such as seals and sea lions.
On the bright side, management efforts over the past 25 years have led to declines in PCBs, DDT and PAHs in some more rural parts of Puget Sound. Contaminants are still high in the central and south basins, but have declined in herring in certain areas, and select populations of juvenile Chinook are seeing similar declines.
The 68-page report also looks at potential impacts of contaminants on humans, and includes some of the findings from studies that were used to determine Washington Department of Health advice for consumption of Dungeness crab and spot prawns.
You can read all of the findings on the Encyclopedia of Puget Sound.
PSEMP Toxics Work Group. 2017. 2016 Salish Sea Toxics Monitoring Review: A Selection of Research. C.A. James, J. Lanksbury, D. Lester, S. O’Neill, T. Roberts, C. Sullivan, J. West, eds. Puget Sound Ecosystem Monitoring Program. Tacoma, WA.